text:
|Publication number
|Publication type
|Application number
|Publication date
|Nov 13, 2001
|Filing date
|Jun 9, 1999
|Priority date
|Jun 16, 1998
|Fee status
|Also published as
|Publication number
|Mark S. Akselrod, Stephen W. S. McKeever
|Original Assignee
|The Board Of Regents For Oklahoma State University
|Export Citation
|BiBTeX, EndNote, RefMan
|Patent Citations (11), Referenced by (41), Classifications (8), Legal Events (5)
|External Links: USPTO, USPTO Assignment, Espacenet
The instant application is related to copending U.S. patent application Ser. Nos. 08/710,780 and 08/879,385, the disclosures of which are incorporated herein by reference. Additionally, the instant application claims priority based on U.S. Provisional Patent Application No. 60/089,500, filed on Jun. 16, 1998, the disclosure of which is incorporated herein by reference.
This invention relates generally to luminescence techniques for imaging radiation fields and, more specifically, to the use of experimental and mathematical methods to distinguish between static and dynamic irradiation and other, related, abnormal radiation exposure conditions. The instant invention would be most fully appreciated by those in the personnel and environmental radiation dosimetry fields, and to fields related thereto.
Current radiation dosimetry methods using photographic film take advantage of the imaging capabilities of the film to map a "radiation image". This is done by inserting radiation absorbing filters between the source of the radiation and the film. When the film is subsequently developed an image of the filters is obtained. This capability is used in the radiation dosimetry community to detect abnormal exposure conditions. The main abnormal exposure condition of interest is the intentional, or accidental, exposure of the film to a radiation source when the radiation film "badge" is not being worn by a person. This might occur, by way of example, if someone placed his or her radiation film badge close to a radiation source in order to expose the badge—but not the person—to the radiation. Such "static" exposures of the badge will produce a sharp image of the filters on the developed film. This is to be distinguished from an exposure in which a person wears the film badge on his or her clothing over an extended period. The images of the radiation absorbing filters in this "dynamic" case are expected to be blurred. By subjectively distinguishing between "sharp" and "blurred" a judgment can be made regarding the likelihood of "static" exposure and, specifically, to distinguish between "static" exposure and the more usual "dynamic" exposure.
Other potential abnormal exposure conditions include the unintentional shielding of the film by external objects (coins, paper-clips, etc.) because the badge was worn incorrectly (say) in a person's pocket, rather than being worn correctly on the outside of a person's clothing. Such exposures are normally detected by observing an image of the object on the developed film. Still other abnormal exposure conditions include contamination of the film badge by radioactive contaminants, or physical damage of the film or the radiation filter. Such conditions typically exhibit "hot spots" or "cold spots" on the developed film.
Others have investigated the imaging of radiation exposure of large area phosphors using optically stimulated luminescence, see, for example, Luckey (U.S. Pat. No. 3,859,527), Ikedo et al. (U.S. Pat. No. 3,957,637), Kotera et al. (U.S. Pat. No. 4,258,264), Kato et al. (U.S. Pat. No. 4,315,318) and Gasiot et al. (U.S. Pat. No. 4,517,463). These references are cited more fully in the attached Bibliography, references (1) to (5) of which are specifically incorporated herein by reference. However, the field of application of each of these patents is medical imaging and the goal in each case is to capture an image of an irradiated object, such as a human body, on a luminescent plate. The latent image on the plate is typically read by scanning with a suitable laser beam. In particular, Luckey (U.S. Pat. No. 3,859,527) records the radiation image by exposing the phosphor to radiation through the object to be imaged, then reading the recorded information by stimulating the phosphor by scanning with a laser beam. The image is read by recording the output of a photodetector as a function of the position of the scanning laser beam on the surface of the phosphor.
Note that the foregoing inventors have focused their efforts on imaging an object, rather than on the problem under consideration herein; namely, the detection of non-standard irradiation of a phosphor sample. Furthermore, the imaging methods published previously do not use the pulsed, synchronized detection techniques described hereinafter.
Heretofore, as is well known in the radiation dosimetry arts, there has been a need for an invention that can provide rapid and reliable detection of abnormal dosimeter exposure conditions over a wide dynamic range of radiation doses (˜1 mGy to ˜100 Gy) without encountering significant background interference or stimulation light leakage. Additionally, the invention should preferably use a pulsed and synchronized luminescence detection scheme. Further, the invention should provide a complete method and system for abnormal exposure detection including the use of a luminescent thin powder layer, the use of a periodic radiation absorbing filter, the pulsed stimulation and synchronized luminescence detection scheme, and a method of analyzing and interpreting the recorded images. Finally, the system should provide some means of mathematically characterizing an image as containing either a normal or abnormal exposure.
Accordingly, it should now be recognized, as was recognized by the instant inventors, that there exists, and has existed for some time, a very real need for a method and apparatus that would address and solve the above-described problems. Before proceeding to a description of the instant invention, however, it should be noted and remembered that the description of the invention which follows, together with the accompanying drawings, should not be construed as limiting the invention to the examples (or preferred embodiments) shown and described. This is so because those skilled in the art to which the invention pertains will be able to devise other forms of this invention within the ambit of the appended claims.
According to one aspect of the instant invention, there is provided a method and apparatus for distinguishing between static and dynamic dosimeter exposure conditions, wherein Pulsed Optically Stimulated Luminescence (POSL) is applied to a luminescent material preferably containing aluminum oxide, carbon, and other essential elements, to assess the character of absorbed radiation doses. By way of general background, the technology associated with POSL is more fully described in co-pending patent application Ser. Nos. 08/710,780 and 08/879,385. In the instant invention, a luminescence detector, consisting of a thin layer of luminescent powder deposited on a suitable substrate, or sandwiched between thin films of (say) plastic, is placed under a radiation-absorbing filter, the filter having a spatially periodic structure with areas of higher radiation absorption coefficient and areas of lower, or zero, radiation absorption coefficient. Alternatively, two filters might be used—one positioned on either side of the luminescent powder—with each having spatially periodic absorption characteristics. A two-filter configuration would make the response of the dosimeter indifferent to its orientation—it would not have a "front" side or a "back" side. The detector and filter(s) are then typically made part of a badge or other device for measuring radiation exposure and sent to the field.
Upon its return from the field, the badge and its associated detector are preferably tested for exposure to radiation as follows. The luminescent layer is placed in the path of a beam of stimulating light in such a way as to uniformly, or nearly so, illuminate the whole of the area of interest of the luminescent layer. The stimulating light is preferably pulsed at a predetermined frequency, and the luminescence emitted from the luminescent layer is detected by an imaging system, such as a camera using a charge coupled device (CCD). The light detection is synchronized to occur between the pulsed laser stimulations and the image recorded by the camera is a representation of the pattern of luminescence emission from the luminescent layer, which in turn is a representation of the pattern of radiation absorption a s defined by the structure of the radiation absorbing filter.
The distinction between "static" and "dynamic" irradiation is then made by observation and/or analysis of the luminescent image so-recorded. In one preferred embodiment, a spatial frequency spectral analysis of the image intensities from the luminescent image is calculated and the resulting values are analyzed. Depending on the resulting numerical values, an image will be classified as either normal or abnormal—dynamic or static.
In brief, it is a goal of this invention to arrive at a rapid and reliable method of distinguishing between "static" and "dynamic" irradiation, while at the same time providing the means to detect other abnormal radiation exposures as listed above.
The foregoing has outlined in broad terms the more important features of the invention disclosed herein so that the detailed description that follows may be more clearly understood, and so that the contribution of the instant inventors to the art may be better appreciated. The instant invention is not to be limited in its application to the details of the construction, or to the arrangements of the components, or to the specific steps of the computational processes set forth in the following description or illustrated in the drawings. Rather, the invention is capable of other embodiments and of being practiced and carried out in various other ways not specifically enumerated herein. Finally, it should be understood that the phraseology and terminology employed herein are for the purpose of description and should not be regarded as limiting, unless the specification specifically so limits the invention.
The file of this patent contains at least one drawing executed in color.
Copies of this patent with color drawing(s) will be provided by the Patent and Trademark Office upon request and payment of the necessary fee.
FIG. 1 illustrates the irradiation of an assembled dosimeter having a spatially periodic radiation-absorbing filter.
FIGS. 2A-2E contains some examples of spatially periodic filter patterns: (A) stripes; (B) orthogonal stripes; (C) woven wire square holes; (D) 2-D array of circular holes; (E) 2-D array of square holes.
FIG. 3 is a schematic drawing that illustrates the principal components of the image readout system.
FIG. 4 contains a timing diagram that illustrates how synchronization is used during data acquisition.
FIG. 5 illustrates the irradiation apparatus showing the rotation stage for irradiation of the sample at pre-determined angles with respect to the incident radiation field.
FIG. 6(A) illustrates a luminescence intensity image for a 30 keV x-irradiated sample (at an exposure of 500 mR) with a 1 mm copper filter consisting of a 2-D array of circular holes; and,
FIG. 6(B) a 3-D projection of the same image.
FIG. 7(A) shows an FFT amplitude spectrum of the image shown in FIG. 6(A); and,
FIG. 7(B) contains a 3-D projection of the FFT spectrum after 10% truncation.
FIG. 8(A) shows an inverse DFT of the amplitude spectrum shown in FIG. 7, which reconstructs the filtered original image; and, FIG. 8(B) contains a 3-D projection of that same image.
FIG. 9 shows values of ξ for a variety of doses under static and two-directional dynamic irradiation with 60 keV x-rays.
FIG. 10 contains a flowchart that illustrates the principal steps in one preferred embodiment of the instant invention.
Before explaining the instant invention in detail, it should be noted and understood that the invention is not limited in its application to the details of the construction and the steps illustrated herein. The invention is capable of other embodiments and of being practiced or carried out in a variety of ways. It is to be understood that the phraseology and terminology employed herein is for the purpose of description and not of limitation.
The invention taught herein may be broadly viewed in terms of three embodiments: dosimeter preparation, sample imaging, and subsequent analysis of the imaged sample. Each will be discussed separately below.
As is illustrated in FIG. 1, the preferred dosimeter 200 is constructed as follows. As a first step, a thin layer 20 of luminescent powder is deposited onto a suitable substrate 30—or sandwiched between suitable upper and lower retaining members 30 and 35—and a radiation absorbing filter 10 is placed in front of, and in close proximity to, the luminescent layer 20 (FIG. 1). The luminescent powder is preferably made up of three or more chemical elements (i.e., it is a "multi-element" material) and possess "lattice defects" that act as storage centers for the latent absorbed radiation dose image. In the preferred embodiment, anion-deficient aluminum oxide, with carbon in solid solution, is used as the tri-element (Al, O, and C) luminescent material. The luminescent center active in OSL from Al2O3:C is an oxygen vacancy trapping two electrons. Crystalline anion-deficient aluminum oxide with a third element (C) in solid solution has an oxygen-vacancy concentration of about 1016-1018 cm−3, which gives rise to a measured optical absorption coefficient of 1-100 cm−1 at 205 nm.
For purposes of POSL imaging, the luminescent material should have a relatively long-lived "prompt" luminescence (i.e. microseconds to tens of milliseconds), as described in the related patent applications named previously. The stored image should have a lifetime at least sufficient for removing the luminescent material from the radiation field and transporting it to the measurement system without significant loss of the stored information. The luminescent material should also have radiation-induced optical absorption within the wavelength range of the optical stimulation. In the preferred embodiment and using the preferred materials, the lifetime of the luminescence from the oxygen vacancy centers (called F-centers) in Al2O3:C is approximately 35-36 ms, and the peak of the luminescence emission at room temperature is approximately 420 nm. F-centers occur in Al2O3:C in concentrations of about 1016 to 1018 cm−3 and exhibit optical absorption at about 205 nm. A wide stimulation band exists in irradiated Al2O3:C, over a range concentrations of about 1015-1017 cm−3, giving an optical absorption band centered near 255 nm.
That being said, other luminescent materials could certainly be used in the alternative and, in fact, the method of synthesis of the luminescent material, the method of preparation of the luminescent layer 20, and the method of fixing the layer to a substrate or between thin films 30 are not critical aspects of this invention. The instant invention can be practiced in many other ways using a variety of different dosimeter materials and detector designs 200. However, the dosimeter 200 described previously is a preferred model for use with the instant invention.
In the preferred embodiment, the filter element 10 of the instant invention contains a pattern of apertures 50 therethrough. The material of the filter 10 is preferably one that efficiently absorbs incident radiation 40, so that the regions of the luminescent layer 20 not covered by the filter 10 experience greater radiation exposure than those that are covered.
The pattern of exposure of the luminescent layer 20 is, thus, dictated by the particular pattern chosen for the radiation filter 10. More generally, the filter 10 need not contain apertures 50, but instead might have areas of higher radiation absorption coefficient and areas of lower, or zero, radiation absorption coefficient. In either case, the same effect is sought: some regions of luminescent layer 20 receive greater radiation exposure than others, and the pattern of exposure is controlled by the filter 10. Additionally, spatially periodic 2-D patterns may be created by using a pattern of woven wires (e.g., FIG. 2(C)), alternating strips of material (e.g., FIGS. 2(A) and 2(B)), etc.
It is possible that in some cases two filters 10 would be employed: one positioned on either side of the luminescent layer 20. One advantage of this arrangement is that a dosimeter 200 having luminescent layer 20 within such a "sandwich" would not have a preferred orientation (i.e., it would not have a "front" or "back"), but rather would function equally well no matter which way it was facing with respect to the incident radiation.
It is an important aspect of this invention that the pattern of radiation transmitting regions in the filter 10 be of known spatial periodicity. This periodicity might be either one-dimensional (i.e., "1-D") or two-dimensional ("2-D"), with the preferred embodiment using a 2-D pattern. FIG. 2 contains some illustrative examples of suitable filter patterns, the "solid" areas in each pattern being relatively opaque to incident radiation. Some examples of 1-D patterns include an array of stripes (FIG. 2(A)), or a linear array of holes (square, rectangular or circular). Examples of 2-D spatial patterns include a 2-D array of square (FIGS. 2(C) and 2(E)), rectangular or circular (FIG. 2(D)) holes. It should be obvious that the examples given herein are for purposes of illustration only and many other spatial arrangements are certainly possible. Additionally, it should be noted that the term "holes" should be broadly construed to also include solid areas in the filter that are more radiation-transmissive than the remainder of the filter, so as to produce a radiation exposure contrast between the "filtered" and "unfiltered" parts of the luminescent layer 20. Finally, the term "spatially periodic" will be used hereinafter to describe any 1-D or 2-D repeating pattern of low or high radiation-transmissive areas.
The filter 10 should be thin enough to minimize shadow formation, but thick enough to provide efficient radiation absorption. Suitable filter materials includes metals, such as gold, brass, copper, stainless steel, lead, etc., as well as certain plastics, ceramics, and composite materials. In short, any material which can be made relatively opaque to irradiation might potentially be used. Other design parameters for efficient operation of the system include optimization of the distance between the filter 10 and the luminescent layer 20. The optimal distance for a given filter will depend upon the filter thickness and the filter material, with the exact dimensions being determined largely by trial and error.
After the dosimeter 200 has been returned from the field, it must be tested to determine the amount, nature, and distribution of the radiation to which it has been exposed. As is broadly illustrated in FIG. 3, the irradiated badge or other dosimeter 200 is tested to determine the amount and distribution of radiation exposure, preferably by stimulating the previously irradiated luminescent layer 20 with a stream of light pulses that are designed to induce the emission of pulsed optically stimulated luminescence (POSL). By way of general background, POSL uses a series of short pulses of light in the range of wavelengths of radiation-induced optical absorption of the luminescent material to stimulate photon emission by the target sample. OSL is detected only between the individual pulses that comprise the stimulation stream. A key variable in this method is the choice of stimulation pulse width (see the timing diagram in FIG. 4), which should be significantly shorter than the lifetime of the prompt OSL from the luminescent material.
Those skilled in the art will recognize that it is important that the power of the stimulation light be low enough to prevent heating of the luminescent material during stimulation. It is also important that the power and wavelength be chosen so as to prevent multi-photon absorption processes from occurring and thereby causing a non-radiation-induced luminescence signal from the material. In light of these concerns, the preferred general approach to dosage measurement (POSL), which is designed to yield high stimulation and detection efficiency and a large signal-to-noise ratio over a wide dynamic range, is illustrated in FIG. 10 and may be summarized as follows:
(a) A large population of excited luminescence centers is induced through the use of an intense pulse of stimulating light (step 400).
(b) This population is kept excited long enough after the cessation of the stimulation pulse to allow the activation (i.e., gating on) of a luminescence imaging detector.
(c) The luminescence emission is imaged only between the stimulation pulses, and no imaging takes place during these pulses.
(d) The detected luminescence from successive stimulation events is integrated by binning (e.g., summing) together (step 410) corresponding image pixel intensities to form a composite image.
(e) The integration is continued over a period of time which is long enough to allow a composite image to be formed which is substantially above the background noise of the detector (step 415).
Of course, in the preferred embodiment the entire data collection process is completely under computer control.
Turning now to the hardware components of the preferred imaging system and as is illustrated in FIG. 3, an image representative of the radiation exposure of the dosimeter 200 is obtained by removing the filter element 10 and applying a stimulating beam 60 to the now fully exposed luminescent layer 20. The beam 60 should be spread uniformly, or nearly so, over the whole area of interest of the luminescent layer 20, this result preferably being achieved using defocusing optics and/or beam expanders 70. The resulting images, upon which have been impressed the pattern of the radiation absorbing filter(s) 10, may thereafter be normalized and analyzed, as described hereinafter. By way of example only, one way of normalizing this image is to compare it with the image of a uniformly irradiated luminescent layer (e.g., irradiated without the radiation absorbing filter) illuminated in the same fashion. This approach will be discussed in greater detail below.
In FIG. 3, the illuminating light is preferably a beam 60 from a frequency-doubled Nd:YAG laser 90 with an output at 532 nm, controlled by a pulse generator 100. The particular laser light frequency used is matched to the choice of the luminescent powder in a manner well known to those skilled in the art. Thus, in practice the laser may not be Nd:YAG and the wavelength need not necessarily be 532 nm, depending on the particular choice of the luminescent powder.
The overall number of illumination pulses is also controlled by the pulse generator. Pulse durations of 1-10,000 ns and repetition rates of 1-30,000 Hz are preferred. Mirrors 80 and 110 are used to direct the beam 60 through a defocusing lens and/or beam expander 70 so as to uniformly, or nearly so, expand the beam 60 to cover the surface of the luminescent layer 20. The mirrors 80 and 110 also steer the beam 60 through a filter 120, and through a hole 130 in the center of a concave, front-surface, spherical mirror 140. Filter 120 is preferably a 515 nm low cut filter. The beam 60 is directed slightly off axis onto the luminescent layer held on the sample holder 150 which is placed such that the luminescence from the sample 20 is reflected off the mirror 140 and back through a second filter pack 160 to the image intensifier 170 of a CCD camera 180. The filter pack 160 contains a combination of appropriate notch, dichroic and glass filters to give an acceptable signal-to-background noise ratio. The image intensifier 170 is gated synchronously with the laser beam 60 pulses such that it is switched off during the laser pulse, and is switched on in the period between pulses. The gating of the intensifier is controlled by the pulse generator. The timing of the gating, with respect to the laser pulse, is indicated schematically in FIG. 4. The pulse generator triggers the laser pulse, which has a duration (peak half width) of T1. The laser pulse occurs during the time interval T2, during which time the intensifier is switched off. After a suitable delay, the intensifier gate is switched on and is kept on for a time T3, during which time a digital signal which is spatially representative of the luminescence image is captured. After time T3, it is switched off again for a further period T2, during which time the next laser pulse appears. The pulsing is repeated until the desired number of digital signals have been collected, with signals being preferably continuously summed to provide the final image signal.
The summing operation to produce the final image is preferably performed as follows. During the periods between the pulses (i.e. during periods defined by T3) each pixel on the photodetector, CCD camera 180, accumulates a charge proportional to the pattern of the light intensity incident on the intensifier 170 window. In this way, the charge on an individual pixel is representative of the intensity of light from a specific location on the luminescent layer 20. The signal on each pixel is preferably accumulated (i.e., summed) over the entire period of the measurement to create a composite image at the end of the sequence of pulses. At the close of the measurement cycle, a numerical value representative of the charge on each pixel is downloaded to an attached or networked computer. To extend the dynamic range of data acquisition, several frames may be downloaded to the computer, each frame consisting of the integrated results of an entire series of pulses. The digital image data, in the form of a two-dimensional array of numbers, thus represents the pattern of luminescence emission from the luminescent layer 20—and is thus a representation of the pattern of radiation absorption. This pattern, in turn, is dictated by the spatially periodic, radiation absorbing filter, and the exact conditions of the irradiation—including "static" or "dynamic" irradiation.
As is illustrated in FIG. 5, according to another aspect of the instant invention there is provided a device to assist those doing visual or mathematical interpretations of field-irradiated luminescent materials. In more particular, the device of FIG. 5 makes it possible to dynamically irradiate a luminescent material 20 through any choice of filter 10 under controlled laboratory conditions. The images obtained from the luminescent materials 20 in these dynamically irradiated dosimeters 300 represent "known" exposure patterns that can be compared with field sample images to help determine whether or not that particular dosimeter 300 was dynamically irradiated. The apparatus consists of an irradiation source 310, preferably an x-ray source, a rotating sample stage 320, and the dosimeter 300. In application, a dynamically irradiated sample is preferably created by setting the sample stage 320 at a particular angle with respect to the irradiation source 310 and then irradiating the dosimeter 300 for a first period of time. The sample stage 320 is then adjusted so that the incident x-rays fall on the dosimeter 300 at a different angle and the dosimeter 300 is irradiated again. It should be clear to those skilled in the art that if the dosimeter 300 is irradiated from a variety of different angles, the resulting luminescent image will be a synthesized representation of that sort of dynamic irradiation. Of course, different combinations of filters 10 and luminescent materials 20 may be tested using this apparatus, so as to build up a library of known responses to particular filters 10 that can be useful in evaluating field samples. Additionally, in the preferred embodiment, it is also possible to adjust the orientation of the sample stage 320 during irradiation, thereby producing truly dynamic irradiation.
By way of an example of the use of apparatus of FIG. 5, note that a periodic array of square holes, if rotated along an axis parallel to one of the lines of holes during irradiation, will yield an image in which the holes appear to merge into one another, thereby producing a stripe along lines perpendicular to the axis of rotation. (See, for example, FIGS. 10(A) and 10(B)). Such an image pattern clearly reveals that the sample was rotated during exposure and it also reveals the axis of rotation. More complex motion (e.g., simple rotation along multiple axes) will produce a smeared image in which the original modulation pattern can be entirely obscured. Additional examples of the use of this device will be given below.
According to a preferred embodiment of the instant invention and as is illustrated in FIG. 10, there is provided a method of analysis of digital images arising from POSL—or any other method of imaging radiation fields—that yields a 2-D digital image, wherein static and dynamic radiation exposure may be distinguished. As a first step, the sample is stimulated in such as way as to cause it to emit light at each point with an intensity that is proportional to that point's radiation exposure (step 400). A preferred way of doing this is via POSL as described previously. However, any other method of radiation field imaging that causes light to be emitted—visible, ultraviolet, or infrared light—that is representative of the sample's radiation exposure would serve as well.
In the analysis stage of the instant invention, the digital images captured by the imaging detector are preferably downloaded for display on a computer (steps 418 and 420) and are interpreted as "dynamic," "static"or some other abnormal exposure condition. Since the image contains impressed therein the periodic pattern of the particular radiation-absorbing filter 10 used, together with evidence of the dosimeter's 200 radiation exposure, the preferred method of analysis is to examine the modulation pattern of the captured image and compare that with the modulation pattern of an image obtained with the same filter under static irradiation conditions. Alternatively, the digital image certainly could be examined directly to assess its exposure characteristics (step 460)—and this can and should be done in practice—however, the complexity of the image obtained from these sorts of samples argues for a more systematic approach.
This aspect of the instant invention provides an automated and objective method of determining the relative likelihood that a particular image was produced by static versus dynamic irradiation. The preferred image processing steps operate on a 2-D Discrete Fourier Transform (DFT) calculated from the stored image to arrive at a "shape parameter" the value of which provides an objective assessment of the likelihood of static irradiation. In the preferred embodiment, a Fast Fourier Transform (FFT) is used in the image processing step because of its computational efficiency. However, those skilled in the art will realize than an FFT is just one way of calculating a DFT.
By way of general mathematical background, if ƒ(x,y) is a continuous function that represents the original image intensity ƒ in an xy plane, then it is well known that the two-dimensional (2-D) Fourier Transform, F(u,v), of this function may be written as follows:
where "V" is the imaginary number, where u and v are spatial frequencies in the x and y directions, and where the u and v axes correspond to the x and y axes, respectively. If, instead, the image intensity function ƒ is a discrete function, ƒ(n,m) defined on an integer grid, a 2-D Discrete Fourier Transform (DFT) may be calculated instead via the following standard double summation:
where N�M is the resolution of the spatial image (step 440).
The DFT is a two-dimensional array of complex numbers that represents the distribution of spatial frequencies in two directions, corresponding to the spatial coordinates x and y. In the usual representation (and as used herein) low frequency components are displayed near the center of the 2-D plot and high frequency components are distributed at the edges. The low frequency components of the DFT tend to represent the gradual variations found in the main POSL-generated (or other-generated) image; whereas the high frequency components are usually a result of pixel noise, sharp contrast features, etc.
Thus, having expressed the image as a DFT, the frequency characteristics of the image can easily be altered by eliminating or attenuating those frequencies not desired. For example, random image noise generally has wide bandwidth, most of which can be filtered from the DFT. Spikes in the original data set are high frequency features and can also usually be easily eliminated. On the other hand, the modulation pattern caused by the chosen filter is a low frequency feature which can and should be retained by an appropriate choice of filter parameters.
As a preferred next step, the Fourier transformed digital data are then displayed on a computer screen using suitable display software (step 460). Interpretation of the data is assisted by employing selected image processing techniques, to be discussed hereinafter. The basic approach, though, is to compare the obtained image with a similar image recorded under controlled conditions. Differences between the control and the test images reveal the conditions of irradiation for the test image.
After viewing the transformed image, a frequency domain filter is specified (step 470). As with all such filters, one goal is to eliminate or attenuate the noise-induced Fourier transform components in the frequency domain and then to calculate the inverse Fourier transform to view the noise-attenuated image (steps 490 and 500). Viewing the transform permits a custom 2-D frequency filter to be designed to match the particular observed spatial frequency distribution for this dosimeter 200, but viewing the image prior to applying the frequency filter is not an essential step. As is well known to those skilled in the art, standard frequency domain filters may be developed for use with particular dosimeter filter 10 patterns, and this will almost certainly be done in practice.
Thus, a reconstruction of the image by inverse Fourier Transform after frequency domain filtering will ideally yield a noise-reduced—but more diffuse—image. The inverse DFT of the frequency domain filtered image is obtained via the following standard formula:
where, g(n,m) is the filtered image, and W(n1,m1) is a weight function that implements the particular spatial filter of choice (step 490). That is, for hard (or "zero-one") filtering, W(n1,m1) will be equal to one if that particular spatial frequency component is to be "kept" and "zero" if that frequency component is to be eliminated. More generally, and is well known to those skilled in the art, W(n1,m1) might take any real value—but would preferably be limited to values between zero and one inclusive—and could include spatially dependent tapers or other signal processing devices to improve the quality of the filtered image.
The general rationale behind a high frequency truncation is that such a frequency domain operation will tend to attenuate unwanted random image noise, whereas, low frequency truncation removes the background near-zero frequency (i.e. "dc") components, and other low frequency components that might be caused by slowly-varying spatial nonuniformities in the image. These nonuniformities might be caused, for example, by nonuniformities in the illumination, in the radiation field, and in the detector sensitivity. After the frequency domain filter has been applied, the remaining components of the DFT spectrum typically contain the desired information about the periodicity of the radiation-absorbing filter and the conditions of the irradiation (i.e. static or dynamic).
In the preferred embodiment, though, rather than inverting the filtered spectral values, a numerical value is calculated from them that can be used to identify potential static, or otherwise irregularly irradiated, dosimeters. In practice, dosimeters so identified would then typically be "flagged" for direct visual inspection. The visual inspection might include, for example, examination of the filtered and reconstructed image, or the original image, or both, for signs of unusual irradiation.
This numerical value is defined as follows. Let ξ be a shape parameter which is broadly representative of the width of the truncated frequency distribution. The parameter, ξ is a normalized parameter and is defined as:
where, Max(�) represents the maximum over the indicated range, and |x| represents the complex magnitude of the argument (step 510). Defined in this way, ξ is a general measure of the spatial frequency distribution of the image. Those skilled in the art will recognize that there are many variations of the previous formula that might be employed in practice. For example, rather than normalizing the previous expression by the maximum value of the spectral values, the average value, median, mean, or any other statistical value calculated from the weighted or unweighted spectral values might be used instead. Additionally, the denominator might be replaced with the sum of all of the unweighted spectral values, the squares of the sums of unweighted spectral values, or any other mathematical function of the weighted or unweighted spectral values. As another specific example, the denominator might be the mean value of the high-frequency DFT magnitudes, in which case ξ would more accurately be characterized as a "relative modulation." Finally, although the denominator is preferably calculated from the image spectral values, it is also possible to use numerical values from a "standard" image in that calculation instead. Any of these approaches might prove to be useful in an appropriate setting.
As an optional preprocessing step, the original image may be normalized before calculating the DFT therefrom (step 435). In particular, a "flat-field" correction image (step 425) may be obtained from a luminescent layer 20 of the sort used in the dosimeter 200 by irradiating it without a filter 10, and then recording the subsequent pulsed OSL radiation "image" from this uniformly irradiated sample. In practice, multiple images of this sort from different luminescent layers 20 may be averaged, summed or otherwise combined to yield a composite flat-field image. The intensity values in this image are then preferably divided—pixel by pixel—into the image obtained from the dosimeter luminescent layer 20 (i.e., the "target" image). This flat-field image 20 acts as a kind of experimental "control" and helps stabilize the numerical computations. Those skilled in the art know that pixel-by-pixel division of the two images is just one way that the flat-field image might be used to correct or stabilize the luminescent layer 20 image and other arrangements are certainly possible and have been contemplated by the inventors. For example, any single statistical value calculated from the flat-field pixel values might be added to, subtracted from, multiplied by, or divided into the target image values. Additionally, difference images (e.g., pixel-by-pixel flat-field image minus target image), product images, etc. are also possible and potentially useful. In the text that follows, the target image will said to be normalized by the flat-field image, with the word "normalized" being understood to encompass a variety of mathematical operations.
By way of summary, the preferred steps in the image processing algorithm used in this invention involve the following steps (FIG. 10):
Display the original image in both 2-dimensional and 3-dimensional views (steps 420 and 430)
Calculate the DFT of the image, thereby obtaining Fourier Transform coefficients representative of spatial frequencies in the image and obtain the frequency spectrum by taking the complex magnitudes of the Fourier transform coefficients, step 440.
Filter, or truncate, the DFT image to eliminate high frequency noise (step 480).
Calculate the inverse DFT of the filtered frequency spectrum to reconstruct the (filtered) POSL image for visual analysis (steps 490 and 500).
Numerically analyze the values in the filtered or unfiltered DFT frequency spectrum by evaluating the shape parameter ξ and use that parameter to characterize the image as being static or dynamic (steps 510 and 520).
Additionally, the steps involved in calculating ξ from the DFT are preferably as follows:
Obtain a "flat-field" correction image by irradiating a luminescent layer without a radiation absorbing filter in front of it and record the subsequent pulsed OSL radiation "image" from this uniformly irradiated sample. This is the "flat-field" image. (In practice an average of several similar images may be taken.) (Steps 425 and 435).
Record the pulsed OSL radiation image of interest (i.e., the image from a luminescent sample which has been exposed to radiation with a radiation-absorbing filter in front of it) in the usual manner (steps 400-415).
Divide the radiation image by the flat-field image to produce the normalized image (step 435).
Calculate the DFT of the normalized image (step 440).
Calculate the magnitudes of the DFT transform coefficients, thereby forming a spatial power spectrum (step 450). Display the resulting spectrum if desired (step 460).
Frequency filter the power spectrum by attenuating high frequency noise components (steps 470 and 480).
Frequency filter the power spectrum by attenuating low frequency noise components (steps 470 and 480).
Sum the magnitudes in the filtered power spectrum (step 510).
Divide the calculated sum by the maximum of the magnitudes in the spectrum to obtain ξ (step 510).
The text that follows contains some experimental results that illustrate how the instant invention might be used to detect abnormal exposure in practice. The flexibility of the technique and its potential for use in radiation dosimetry are also discussed further.
The example experiments described below are meant to be illustrative of the procedures described previously and should not be construed as being definitive descriptions of the experimental procedures actually employed.
Anion-deficient aluminum oxide, with carbon in solid solution, was chosen as the tri-element (Al, O and C) luminescent material 20. The samples consisted of 15-63 μm grains of Al2O3:C single crystal powder deposited between upper and lower plastic retaining members. The exact method of preparation of the samples, including the method of deposition of the luminescent material and the material used for the plastic retaining members, is not discussed herein, as methods for doing this are well known to those skilled in the art. All that is required is that suitable luminescent layers exist to establish a readable and interpretable image.
The stimulation source used in these experiments was a Nd:YAG laser operated in the second harmonic with an output at 532 nm. The parameters chosen for the experiments were a pulse repetition frequency of 4000 Hz and a total stimulation duration of 30 seconds (i.e. 120,000 stimulation pulses). The laser pulse width was 300 ns, with an average energy per pulse not exceeding 1 mJ. Various considerations regarding the choice of laser power for use during POSL measurement are covered in co-pending U.S. patent application Ser. No. 08/879,385, cited previously. The image intensifier on the CCD camera 180 was gated off for a total of 25 μs starting before the initiation of the laser pulse (i.e., T2 in FIG. 4). The photocathode of the image intensifier 170 was cooled to a temperature of −12� C., and the CCD array was cooled to a temperature of −45� C. during the measurements. Using this arrangement the background noise from unirradiated samples was kept at a minimum.
A thin layer of Al2O3:C powder deposited between upper and lower plastic retaining members was exposed to x-rays of a variety of energies and at a variety of doses through a copper radiation filter consisting of a 2-dimensional array of circular perforations (see FIG. 2(D)). The samples were exposed in one of three configurations:
(1) "Static" irradiation in which the sample was held perpendicularly to the radiation field and the total dose was delivered at one time without moving the sample.
(2) "1-directional dynamic" irradiation in which the sample was irradiated in eight segments, for the same total dosage as in configuration (1). During each segment the sample was held at a fixed angle with respect to the radiation field but was rotated about an axis perpendicular to the radiation field between irradiation segments. In total, eight different angles were chosen (10� apart).
(3) "2-directional dynamic" irradiation in which the sample was irradiated in eight segments, for the same total dose as in configuration (1). During each segment the sample was held at a fixed angle with respect to the radiation field but was rotated about two orthogonal axes, each perpendicular to the radiation field. Four of the irradiation segments (20� apart) were for rotation about one of these axes, and the remaining four (also 20� apart) were for rotation about the other axis. In total eight different angles, four each about the two axes, were chosen.
As discussed previously, the irradiation apparatus is shown schematically in FIG. 5 and consists of an x-ray source 310, a rotating sample stage 320, and the dosimeter 300. Thus, the orientation of the sample with respect to the direction of incidence of the radiation can be altered during irradiation if necessary.
After irradiation, the filter 10 is removed from the sample 300 and the luminescent material 20 is transported to the POSL stimulation apparatus for testing. Upon stimulation of the irradiated sample, using the conditions described above and the apparatus and timing scheme illustrated in FIGS. 3 and 4, an image of the pattern of luminescence emitted from the sample is detected by the intensified CCD camera 180 and the digital output stored as a computer file. Output files may be 8-bit, 16-bit, or any other suitable format.
Using conventional computer image display software, an image of the luminescence emission pattern was produced. An example of such as image is shown in FIG. 6(A) for 30 keV x-rays and a dose of 500 mR. FIG. 6(B) shows the same image as a 3-D projection. The sample in this figure was irradiated in a static configuration.
The next step is to calculate a DFT of the image—and its associated power spectrum—using formulae introduced previously. The frequency spectrum of the image in FIG. 6(A) is illustrated in FIGS. 7(A) and 7(B). As is well known to those skilled in the art, the coefficients which result from a Fourier transform of image data represent the power in the data of each spatial frequency. Note that most of the information in the original image is concentrated in the low spatial frequency region which is situated by convention at the center of the diagram in these two views.
The higher frequency components (which might be due to pixel noise, etc.) can now be eliminated by filtering, or truncating, the DFT. In the preferred embodiment, the degree is controlled by selecting a parameter which varies between 0% and 100%, with a value of 100% meaning that no filtering takes place and a value of 0% indicating that the entire DFT has been set equal to zero. Intermediate values represent the proportion of spatial frequencies retained in the analysis. Additional filtering, such as removal of the central/dc component of the DFT, can be applied at this point, if that is desired.
An inverse DFT is now performed and the filtered original image is thereby reconstructed (FIGS. 8(A) and 8(B)). This image is available for visual review.
The shape parameter ξ, was evaluated for images obtained under differing conditions of irradiation, including different doses, different energies, and static versus dynamic conditions. In general, the lowest value of ξ is obtained with the "static" irradiation case, and the highest value is obtained with the "2-directional dynamic" irradiation case. The "1-directional dynamic" case, where the sample was rotated about one axis only, yielded intermediate values for ξ. A summary of the ξ values calculated from the images obtained under the static and two-directional dynamic configurations is shown in FIG. 9 as a function of x-ray dose (in mR) for 60 keV x-rays.
Analysis has shown that the value of the shape parameter ξ is dependent upon dose and radiation energy, and upon the details of the chosen radiation filter pattern (hole diameter, spacing, shape, etc.). It is important to note, however, that these analyses indicate that ξ still preserves the ordering indicated in FIG. 9, namely that a lower value of ξ is obtained for static irradiation cases as compared with dynamic irradiation cases. Generally speaking, single-valued cut-off values for ξ that separate static and dynamic irradiation cannot be given, but rather a "discrimination function" will need to be determined for the particular filter type, radiation energy, dose, and optical system under consideration.
Experiments have suggested one preferred discrimination function that can be used to distinguish between values of ξ arising from static versus dynamic irradiations. That function takes the general form:
where A and B are constants that depend upon the details of the optical system being used (including magnification, etc.). Values of ξ>ξdiscr at dose D indicate dynamic irradiation, whereas ξ<ξdiscr at dose D indicates static irradiation. The previous expression and associated inequalities are true—independent of energy—up to a limiting energy, E1. The particular value of E1 is dependent upon the filter material and the filter thickness, with heavier material (e.g., lead instead of copper) and thicker filters causing E1 to increase to higher values of energy. For the examples show herein (1 mm thick copper) E1≈150 keV.
Although the experiments discussed previously and much of the general discussion elsewhere contains references to the use of POSL as a means of producing a radiation exposure-dependent image from the luminescent material 20, this language was chosen for purposes of specificity only, rather than out of any intention to so-limit the method of determining whether an image is a result of static or dynamic exposure. In more particular, POSL, continuous stimulation, and thermoluminescence, etc., may all be used to create the image (and, optionally, the flat-field image) that is subsequently analyzed by the instant methods. The essential feature of the methods disclosed herein is that they operate on a luminescent image of a previously irradiated sample, wherein the amount of emitted light at each point is representative of the radiation dosage at that point.
Finally, although the instant invention is described as using the DFT as part of the image processing embodiment, those skilled in the art will realize that the Fourier Transform is just one of many spatial transforms that might be used. In particular, the Fourier Sine and Cosine Transforms, the Hartley Transform, Walsh Transforms, and various Wavelet transforms are some of the many transforms that could be used instead. Thus, in the claims that follow, "DFT" will be taken to represent more than just the Discrete Fourier Transform: it will be used to generally represent any orthonormal-basis transform that produces transform coefficients.
While the inventive device has been described and illustrated herein by reference t o certain preferred embodiments in relation to the drawings attached hereto, various changes and further modifications, apart from those shown or suggested herein, may be made therein by those skilled in the art, without departing from the spirit of the inventive concept, the scope of which is to be determined by the following claims.
The documents that are listed hereinafter are specifically incorporated by reference into this patent application.
1. G. W. Luckey Apparatus and Method for Producing Images Corresponding to Patterns of High Energy Radiation. U.S. Pat. No. 3,859,527. Jan. 7, 1975.
2. M. Ikedo, Y. Yasuno, and T. Yamashita, Device for Storage and Display of a Radiation Image, U.S. Pat. No. 3,975,637. Aug. 17, 1976.
3. N. Kotera, S. Eguchi, J. Miyahara, S. Matsumoto, and H. Kato, Method of and Apparatus for Reading Out a Radiation Image Recorded in a Stimulable Phosphor. U.S. Pat. No. 4,258,264. Mar.24, 1981.
4. H. Kato, M. Ishida and S. Matsumoto, Method and Apparatus for Processing a Radiation Image. U.S. Pat. No. 4,315,318. Feb. 9, 1982.
5. J. Gasiot, P. F. Braunlich and J-P. Fillard, Method and Apparatus for Real-Time Radiation Imaging. U.S. Pat. No. 4,517,463. May 14, 1985.
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Photos: Fernando Montiel Bangs Forward in Baja Cali
By Rafael Soto
Former three division champion Fernando "KOchulito" Montiel (46-3, 36 KOs) stopped Álvaro Pérez (21-4-1, 12 KOs) in the third round of a super bantamweight bout at the La Cetto Vineyards in the Guadalupe Valley, Baja California, Mexico. It was Montiel's second bout in the division and he wants a title shot next.
[QUOTE=goblin213;11018175]I would like to see him face the winner of Nishioka-Marquez. Btw did any1 see the fight? How did he look?[/QUOTE] The first round was about even, the commentators gave it to Choculito, no problem; but they also gave him…Comment by Evil Abed on 08-22-2011
danrafaelespn Dan Rafael [B]Just watched Fernando Montiel's 3rd-rd KO of Alvaro Perez from Sat night. Honestly, he went down from punch that didn't look like it landed.[/B]Comment by SuckaPunch on 08-21-2011
Just saw the video, I'm sorry but Montiel looked like sh*t in that fight. He was squaring himself too much and his attacks were very reckless. I actually thought he looked good against Donaire (minus the KO of course). But…Comment by LaMigra on 08-21-2011
[QUOTE=vacon04;11018188][/QUOTE] Montiel can be the best as long as Donaire never fights again.Comment by Medved on 08-21-2011
What a NAME, Guadalupe! Hey puta come here and suck on my Guadalupe, hey homey, this Guadalupe is talking smack to us, lets Guadalupe him. Hey honey, can you make me some Guadalupe? Guadalupe is my new universal world. Suck…Post a Comment - View More User Comments (19)


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IBM researchers claim to have made the smallest magnetic memory bit. To store 1 bit of data with normal hard drives, it takes 60,000,000 atoms. IBM's discovery can store a bit of data in just 12 atoms, opening the door for technology on a nanoscopic level. Read the full article at BBC.co.uk
About Shelly Palmer
Named one of LinkedIn's Top 10 Voices in Technology, Shelly Palmer is President & CEO of Palmer Advanced Media, a strategic advisory and business development practice focused at the nexus of technology, media and marketing with a special emphasis on data science and data-driven decision making. He is Fox 5 New York's on-air tech and digital media expert and a regular commentator on CNBC and CNN. Follow @shellypalmer or visit shellypalmer.com or subscribe to our daily email http://ow.ly/WsHcb
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About Domaine/Maison Joseph Drouhin
Any casual inquiry into Burgundy will invariably reveal the Drouhin name. Founded in 1880, this leading négociant and vineyard owner maintains vines in Chablis, Côte de Nuits, and Côte de Beaune.
2013 Domaine/Maison Joseph Drouhin Beaujolais Nouveau
Producer: Domaine/Maison Joseph Drouhin
Style: Red Wine
Grape Type: Gamay
Origin: France
Region: Burgundy
Appellation: Beaujolais


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Villa Bordoni
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Historical Traveler Reviews Villa Bordoni Greve
Beautiful Boutique Hotel in heart of Chianti Countryside
We stayed at Villa Bordoni with our 1 year old baby recently. It is a high quality and very lovely boutique hotel set in amongst some beautiful hills in the Chianti countryside. The gardens are delightful and views very beautiful.
Both David and Catherine are very welcoming, as are their staff and work very hard to ensure all guests are well looked after. They were very flexible which made for a more relaxing stay.
While somethings aren't perfect, the fact that David, Catherine and staff go out of their way to ensure you have an enjoyable stay makes it a positive experience.
The Tuscan Dream!
Sometimes you find a treasure which you want to keep for yourself and therefore you hesitate to share it with others. The Villa Bordoni in Chianti is definitely one of these places [----]. But because it is such a special place with a wonderful ambience, service and style, we feel obliged to share the experience of this charming place.
You may think you are on the wrong track when driving the small dirt road up to the villa, but once you have arrived nothing will put you off. The setting can not be more beautiful. The owners David and Catherine, together with the entire staff, are the most charming, helpful, friendly and professional people! It is a family atmosphere here, yet very correct and refined. The rooms are gorgeous and comfortable with impressive large bathrooms. All of the public areas are carefully decorated with a perfect elegant taste. You are up on a hillside in Chianti with about 10 minutes drive to the closest village. The views are breathtaking. The garden is very picturesque and includes a large pool and a small modern outdoor workout area. The chef creates wonderful food with the finest fresh ingredients. There is really no need to dine elsewhere, but of course, the region has plenty to offer to satisfy any gourmand's appetite; many good places are at a close distance from the hotel. The ma�tre d'h�tel has a great amiable personality and will help you to find the right bottle of wine from their nice selection in the wine cellar. With his presence the evening is sure to be amusing, relaxed and enjoyable. We could write so much more about the Villa Bordoni, but words can not entirely describe the overall overwhelming experience. If you want to visit Tuscany and the Chianti area, this is the place to stay at. Take our word for it! You will not regret it!
Amazing setting for honeymooners
My husband and I stayed here for two nights during our honeymoon. The views are spectacular; the accommodations, luxurious. The owners, David and his wife, couldn't have been more hospitable. Not only did they upgraded us to the honeymoon suite, but David personally made us a lunch of fresh meats and cheeses and local wine when we arrived at the hotel after getting lost in Chianti. He tended to our every need and gave us fabulous (and easy!) directions on the way back to make sure we didn't get lost again. I would recommend this hotel without reservation.
Little Paradise!!!
My husband and I stayed in Villa Bordoni for one week and absolutely loved it - we even tried to extend our flights for an extra night. The staff are so friendly and the food is amazing - really romantic - differnt menu every night. The restuarant has a cosy feel to it with candles and you don't ever feel rushed. David was amazing - One thing I love about the villa and the area is that it is very quiet and not very touristy!! going back next year!
Above and beyond...
My sister and I were guests at Villa Bordoni due to a series of cooking classes arranged through International Kitchen. The following reviewers are correct in saying how wonderful Villa Bordoni is. Not only is the property breathtaking (beautifully restored down to the smallest detail), but the staff and owners make you feel like you're a guest in their home. Gianluca, restaurant manager/house entertainer, couldn't have been more friendly and welcoming. Ricardo was also so accomodating and helpful. And David and Catherine (the owners) are extremely knowledgeable, hospitable, and gracious, etc... And the cooking staff: Francesco, Nancy and Mark were wonderful in every sense. We truly enjoyed our lessons and made the most of all the dining opportunities. Breakfast on the patio, overlooking the countryside, was an amazing way to start the day.
We were actually at the villa at the same time as 2 other reviewers and can say they everyone seemed to be having the best vacation. The size of the villa makes it easy to socialize with the other guests, but also allows for privacy. Many friends were made during our weeklong trip, and we've all vowed to return. My only regret is that how far away it is; otherwise, we'd return every year. Just a spectacular place to stay!
We got married here on 2nd September, we booked out the whole place for ceremony and reception. The location, the staff, food, wine, the service ,the hotel - we couldn't fault a thing - in fact they exceeded all expectations. We couldn't have asked for better - we had a fantastic afternoon cooking lesson, many amazing meals, a beautiful room. Our guests were dazzled - so were we - thankyou!
Magnificent in every way
There aren't enough superlatives to describe Villa Bordoni. My wife and I stayed there for six nights and loved every delightful moment. Our room had all the charm of a country villa with modern conviences and tremendous attention to detail. The service staff are great. Gianluca, the maitre'd was knowledgeable and kept us entertained all the time. Ricardo was always on hand to help with most any question we needed answered, always with good humour and charming..Most of all, Catherine and David treated us like family and I can't express how much we enjoyed being with them and their family. They went far beyond what a guest would expect in service. The environment is totally relaxing and casual. The extremely creative chef, Francesco is very skilled and each meal we consumed was a wonderful treat. All the staff worked hard to please our every whim. You can sit outside for breakfast and look out over the valley to your left and up the mountain to your right. All the views are magnificent. There is even an outdoor gym hidden above the pool, that overlooks the valley. It's so beautiful it almost makes you want to work out... Both the gym and pool are set into the hillside in a way that makes them blend into the background. The cooking classes drew raves from those taking it. Because there are only ten rooms. you get to meet everyone and we had a great time. We would definitely go back and back and back.. We'd like to keep this place a secret, but it wouldn't be fair to David and Catherine .
Lawrie and Debbi
The heart of Tuscany..........
We spent four nights as part of our honeymoon at VIlla Bordoni and had the most fantastic time. The staff, surroundings, food and wine were all amazing!
Everyone was there to make you feel at home and couldn't do enough for you. The cookery lesson was excellent and Francesco really is a masterchef! Gianluca, the restaurant manager, really made us feel at home and served the best cocktails and steak ever!!
The owners are very down to earth and approachable and arranged everything perfectly, including an impromptu wine tasting lesson which was great fun!
We will almost cetainly go back and hope this place gets the custom it deserves.
Fabulous Villa, Owners, Staff, Chef, and Golden Retrievers!
We were only able to stay for one night, but I highly recommend Villa Bordoni and would love to return for a private cooking lesson. David and Catherine greet you personally and work hard to assure that your stay is perfect.
We had a wonderful dinner outdoors in the evening, watching the daylight fade into a beautiful Tuscan summer evening. The food was divine, and I was lucky enough to share a few bites with the beautiful golden retrievers, Millie and her pup (I'm so bad with names). Breakfast was set outdoors and quite lovely.
A very nice pool in a lovely setting invites you to relax, and there are many places to sit and read or enjoy the garden and the surrounding view.
The entire villa has been lovingly restored with attention to every detail. The shower is fantastic!
You will need to phone the desk when you get close unless you are much better at finding villas set in the middle of vineyards than we were. I live in Italy and had a Navigon, but I still needed some final directions to find the Villa at the end of a long gravel road. It's the road less traveled, and it's certainly worth the trip!
An absolute gem
I have been meaning to do this since we got back from Italy because I searched for information before our honeymoon and there really wasn't much on this fabulous villa. I'm almost wary of saying anything because I wouldn't want it to be spoiled by too many visitors!
We spent 5 days at the Villa Bordoni a month ago for a part of our honeymoon. It really is wonderful. Unpretentious, yet very elegant. A lot of attention was paid to detail and though they did a fantastic job of keeping the feel of an old villa through incredible renovation, they've added really nice touches like large shower heads and a flat screen tV to the room, not to mention the really comfortable bed and linens.
The owners, David and Katherine are so nice and helpful, David is especially warm and effusive regarding information on the area and suggestions of things to do. They are just really low key and that seems to attract similar kinds of guests. It's a really small place so expect to start talking to others at breakfast or dinner, but it really lends an air of intimacy to your stay.
The food is terrific, dinner is expensive so we didn't eat there every night; however, we took a cooking class during the day and they served the meal for dinner that night... really fun, we'd highly recommend.
I could go on and on...and back and back!! Go!
TripAdvisor Reviews Villa Bordoni Greve
Travel Blogs from Greve
Another beautiful day for a fantastic view
... been very annoying although they do warn you about it). The tombs for the Medici family are certainly huge and ornate, including wall decorations in the marble and the inlaid marble floors, etc. All these places now don't allow any photos unlike a number of years ago.
Next we visited Santa Maria Novella, the church near the station and one we hadn't been into before and we were amazed by its size and the number and quality of frescoes. We started in the crypts since we had ...
I'm lost for words - Florence!
... down the road between it and the Uffizi looking for Via Del Rustici and my room for the next 6 days.
The young fellas who are out on the streets selling everything you can imagine were doing a great trade in cheap umbrellas, but I waved them all away, as I would do for the next 5 days and ploughed on. After trekking through Florence for about 15 minutes I reached the corner of the street I was looking for and stopped to check the number only to hear a young woman's ...
'Fair Firenze' - Florence
... For one of the exhibits, it had something interesting written: "Mutilation of breasts and female genitalia has been an omnipresent and constant usage throughout history. Insomuch as the soul of torture is male, male organs have always enjoyed the benefit of a species of immunity (notwithstanding certain exceptions), a fact that leads to the hypothesis of a fraternal understanding between male victim and male judge-torturer, an understanding that must have been ...
Florence finally!!
... 8217;t allow us to take photos and I really couldn't sneak any this time like I did of the Sistine Chapel. My knife also didn't get past security- at one of the museums. That surprised me, seeing as how easy it went through the security at the Vatican Museum…. Oops. So, I don't really have any pictures to show you.
We don't have internet at the apartment, yet, (I'm at a cafe) but I'll do my best to keep you all updated! ...


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BSE:532638 | NSE:SHOPERSTOPEQ | 58888:shop | IND:Retail - Departmental Stores | ISIN code:INE498B01024 | SECT:Retail
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Last year the economic environment continued to be challenging. Inspite of that, your Company has registered an impressive growth, which speaks highly of the resilience of the business model and the quality of the management. During the year, your Company has launched 6 Shoppers Stop departmental stores, 1 HomeStop, 4 M.A.C stores, 2 Clinique stores and 3 Bobbi Brown stores.
The Company reported an annual turnover of Rs. 3,370 crores for the year under review as compared to Rs. 3,017 crores in previous year, a rise of 11.7%. Net Profit for the same period stood at Rs. 40.7 crores as compared to Rs. 37.0 crores FY ''14; up by 10%. The Company''s financial performance has been satisfactory due to sustained engagement with customers coupled with internal operating efficiencies.
Driving ahead its successful Loyalty programme, the Company continued to expand its membership base by adding new members to the First Citizen Loyalty Programme. The programme now has a total First Citizen base of over 37.36 lac members and today it is one of the largest loyalty programmes across sectors which have contributed to 72% of your Company''s sales. Your Company''s First Citizens continue to be a huge bastion of support for your Company. It is very important for a retail company like yours to remain in touch with customers at all the times and social media is an important avenue to remain in constant touch with customers. Our Facebook fan club is also growing very fast. It has now crossed 6.68 million fans.
By 2020, India will have 40-50% Internet penetration accessed from all kinds of devices viz. desktops, tablets, mobiles, TV. The penetration of online shopping amongst the Internet users will grow from 20% (2014) to 40% (2020) thanks to improvements in digital connectivity (3G/ 4G) and smartphone growth. Further, more than 80% of the online population will access the Internet via smartphones and tablets.
Mobiles will make Internet accessible to the rural masses driving online commerce. E-commerce is an emerging sales channel and your Company strongly believes that it is an opportunity to expand its sales and customer base.
Omni-channel initiatives of the Company will be a key pillar to its growth strategy. To this purpose, the Company have signed a new technology platform for our e-tailing initiative. The Company is confident of generating 10% of revenue from digital channels in next three years on the back of its omni-channel efforts with an investible corpus of around Rs. 50 crores in Omnichannel technology.
For the year under review, your Company received a number of coveted awards. These have been featured on page no 22 & 23 of this Annual Report. The significant awards inter-alia includes selection as "SUPERBRAND" in India, Tata Institute of Social Sciences (TISS) Leap Vault CLO Awards - L&D Team of the year award. Best Supply Chain Company in Retail Vertical at the 8th Express Logistics and Supply Chain Conclave, Best Employer Brand Award at the 5th Asia Best Employer Brand Awards, National Award for Excellence in Training & Development for the Best Leadership Development Programme for Top Management at the World HRD Congress, Golden Peacock Eco-lnnovation Award established by Institute of Directors, 25th rank in the "Great Places to Work in Asia", 27th position in "Top 50 Great Places to Work" amongst 600 Top Indian Companies, Global Award for Excellence in Supply Chain Innovation from World Quality Congress, The Most Efficient Supply Chain Company in Retail vertical by Confederation of Indian Industries Summit.
While Shoppers Stop continues to do well, HyperCity Retail (India) Ltd; subsidiary, too has shown significant improvement over the last year. The key highlights of HyperCity''s performance were sales up by 6.4%, Like-to- like sales per sq. ft. growth of 15%, net margin growth of 130 basis points and first ever Company level EBIDTA profit in Q2 and Q3. This has resulted in the consolidated FY ''15 results to be far ahead of the FY ''14 consolidated results.
In conclusion, I would like to thank our shareholders for their continuing support. I also thank all the members of the Board and other stakeholders for their valuable contributions from time to time. The year''s achievement have been made possible by the hard work put in by all the associates of the Company.
CHANDRU L. RAHEJA Chairman
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$0.99In this opening chapter of the landmark "Love Showdown" storyline, Archie receives a mysterious love letter. When Betty and Veronica catch wind of the mash note, each believes the other one sent it, and all-out war is declared to determine who will win Archie's heart once and for all!
$0.99Its déjà vu all over again when Betty and Veronica hear about a movie shooting in Riverdale about a love-struck teen named "Arnie" caught in a love triangle between a blonde named "Betsy" and a brunette named "Victoria!" Things are further complicated by the arrival of a redheaded bombshell from Arnie's past... three guesses who sold this story to the movie producers!
$1.99"A Not-So-Cool Yule": Archie is having a stress-free holiday season, until both Betty and Veronica give him Òmatching sweatersÓ that they expect him to wear Ð the only problem is, the designs the girls chose donÕt match! "Cold Comfort": Veronica thinks Archie is being chivalrous about her onion breath, when he merely has a cold! "The Fix is In": When Mr. Lodge and Smithers see Archie with a tool
$1.99"Santa Cause": A bump on the head turns grumpy Mr. Lodge into jolly St. Nick - and the townsfolk end up with wads of cash instead of toys! "The Big Problem": Archie decides that his girl problems are trivial compared to giving counsel to the elderly - until he finds out the man at the nursing home has the same problems! "The Average Awards": Archie receives the "Average Good Citizen Award," and
Betty & Veronica Double Digest #186Keep Those Library Doors Open, Skate Perk!, & One Year Later.Budget problems threaten to write the last chapter for the Riverdale Library. Can Betty & Veronica rewrite the story and Keep Those Library Doors Open? Then Archie is falling for the fairer sex again… literally, in Skate Perk! Finally, holiday memories past come to haunt Veronica in One Year Later.
Betty & Veronica Double Digest #198Betty and Veronica in "The Protector!" - Mr. Lodge's private screening room has been converted into a silent movie theatre for the kid's enjoyment! Archie offers his protection to the girls if the horror movie becomes too scary but will Archie be up to the task when the lights go down? And the only thing Mr. Lodge has to beware is Jughead's monstrous appetite! Betty in "Rhyme and Reason" - Betty's
$2.99"The Face in the Mirror": A poignant tale that asks the question, does Veronica have a conscience after all? "She Just Can't Win": Veronica simply cannot... will not... believe her brand new designer dress was designed by... Betty! "Economizing": When it comes to saving money, it's all a matter of perspective... and in Veronica's case, the amount of "zeros" in the final figure! "It Takes a Thief":
$1.99"That Guy": Confident he's keeping Veronica from getting jealous, Archie insists a girl who recognizes him is mistaking him for someone else... until she reminisces about all the goofy things that "someone else" did! "Modern Marvelous!": Archie's parents complain that modern technology has made them lazy, so Archie takes them to the gym to work out on modern exercise machines! "King For a Day!":
Betty & Veronica Double Digest #190Pop Ups Here and New SpinIn Pop Ups Here, Veronica begins to feel the financial pinch and may have to (gasp) get a job! But while shopping she comes up with a solution on how to keep stores at the mall from closing and help Mr. Lodge and his business. Next, New Spin finds Bettys plans to go bike riding ruined by the rain. When she decides to ride a stationary bike at the gym instead, she finds the
$3.99Its summer time at Uncle Hugos Sunny Side Fun Camp and all the young campers are anxious to run the obstacle course. But first, its up to camp counselor Archie to demonstrate just how its done. The reliable klutz that he is, Archie will do his best to not fulfill Uncle Hugos disastrous predictions and prove its No Obstacle! As Little Betty bakes cookies for Veronicas party, Caramel the cat adds a
$1.99"How to Survive High School": Archie's got all the answers a teen needs to navigate through the tricky world of high school. It's too bad his answers don't match the teachers' questions! "Feeling Fuelish": Archie and his friends imagine a world without fuel - and it's a "gas"! "Come Blow Your Horn": Deciding a "new sound" is needed for the band, Archie takes up the Alpine shepherd's Alphorn. One


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Plenty more battles to fight if economic war is to be won
Marc Coleman quizzes the Tanaiste on his tactics for dealing with the ECB chief and his own Budget dissenters
Published 15/09/2013 | 05:00
A few weeks back, Tanaiste Eamon Gilmore attended the 1913 Lockout commemoration that is the start of several such events in the coming decade. And as we exit the bailout this year we are in an economic sense re-enacting one of those centenaries. Our economic war of independence is still ongoing and on Thursday I asked the Tanaiste about his role in the crucial battles, his plans to haul Jean Claude Trichet before the banking inquiry and whether some ministers are more interested in a civil war than a War of Independence. Finally, I asked him if the full €3.1bn adjustment wanted by the Troika is good or bad for the war effort.
In fairness to the Tanaiste – and his department, which covers trade and foreign affairs – they have two crucial victories under their belts so far in this war. Our exports are growing at double the rate of world trade growth. The vigilance of Gilmore and his team – and Enterprise Ireland and the IDA – in conducting trade missions around the world (this author helped with one of them) has helped put a strong wind at the back of our exporters. They have also been instrumental in restoring a national reputation badly damaged by the previous administration.
"We have worked over the last two-and-a-half years to rebuild our reputation in terms of trade and to expand our reach. We have decided to consciously use our embassy network to lead that to co-ordinate the entire trade effort across government," Gilmore said.
He is happy with the OECD's vote of confidence in our recovery but acknowledges vaguely that it has slated the Government for a lack of reform (still too many quangos). Although we are technically back in recession, several trends look positive: 33,800 net jobs were created in the 12 months to July. If sustained, full employment should be restored by 2020. Business confidence is also returning and – if at excruciating cost to taxpayers – the fiscal situation is improving.
Here Gilmore is annoyed at "austerity hawks" whom he thinks want us to suffer more than we should. "We will do what is necessary but there is no case for doing more and my reference to austerity hawks are those people who say, 'OK we know you are going to hit your targets but you should do the €3.1bn anyway.'"
Who are the austerity hawks, I ask: the ECB? "I didn't identify anybody, I didn't name anybody, I'm not in the business of naming anybody."
But if he won't identify the ECB he is unlikely to see it as a gallant ally. Earlier last week he suggested asking Jean Claude Trichet to appear before a banking inquiry. There is a touch of the Dreyfus affair here perhaps: it was Trichet who warned us as early as 2005 to rein in our bank lending and be more cautious about growth. And it was parties like Labour and others who ignored that advice by assuming in their 2007 manifestos that growth would continue. The Tanaiste's people assure me that the plan is merely to get Trichet to appear before the banking inquiry to help clear the air.
The trouble is it might do more than that. In a rejection of a request to publish the letter from Trichet to Lenihan in November 2010 – a letter allegedly threatening a withdrawal of bank funding (that would have shut down every ATM in the country) if Ireland didn't enter the bailout – the Department of Finance stated that publication could have a "serious adverse effect" on our financial interests. Gilmore seems to contradict this: "Internationally the distinction is being clearly made between what happened in the past and what is happening now."
And even if he does appear, Trichet could be more popular than we think: when our governments were taking money out of our pockets in tax hikes his rate cuts were putting it back in.
To win a war an army needs to be united. But there are some – advocates of hiking PRSI for the self-employed – who seem to want to shoot our own best soldiers in the back. Here Gilmore's comments suggest these views are more individual than collective: "Some of that reflects their own department priorities. Some of that reflects particular perspectives they have on the Budget and, you know, are there differences? Yes, but we'll make a collective decision."
When it comes, that Budget may disappoint the "austerity hawks". "I've said publicly a number of times that it is possible for us to reach our targets – and without an adjustment of €3.1bn." What he ignores is that it was far swifter and deeper austerity – cuts in spending equal to 10 per cent of GNP between 1987 to 1990 – that launched the good phase of the Celtic Tiger. That successful adjustment also kept taxes as low as possible.
Which brings us finally to corporation tax. A supporter of our regime up to now, Angela Merkel may have to switch coalition partner after this month's general election in Germany, from the free-market, low-tax Free Democrats (who like low corporation taxes) to the left-wing Greens (who don't). This may force her to take aim at Ireland. News on Friday that EU finance ministers are already "scrutinising" our tax regime is ominous. Here Gilmore is in a dilemma. His party's left- wing ideological allies have whipped up populist hysteria against low corporation taxes that they blame for the collapse of Hypo real estate which cost German taxpayers billions. But they have the wrong culprit: it was weak regulation, not low corporation tax, that caused our financial meltdown. And a tax regime that helps Ireland's exporters recovery can only be good for the Eurozone and by extension the euro.
If the recovery is to survive the next year, Eamon Gilmore and his department will need all their strength and skill to make that message loud and clear in Berlin.
Sunday Independent


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