PMC4937681_01
Three-dimensional PET study of the left hand (on the right) and schematic illustration of the contamination site in fingers I & II (grid pattern). There is activity in the distal part of finger I and proximal parts of finger II (palmar & radial surfaces). In the PET image, the lower hot spot corresponds to the activity in finger I, and the activity above it demonstrates the two areas of proximal finger II. The total F-18 activity was less than 50 kBq at the time of imaging, and therefore, the acquisition time was 15 min. Note that the fist is more opened in the schematic view than the actual PET image, but still the regions can be distinguished
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F1
His left hand was scanned, using Siemens Biograph PET Camera, and two separate hot spots were found in the regions of fingers I and II, as shown in Figure 1.
The gamma spectrum measurement of the contamination demonstrates an energy peak in 500-550 keV region (due to positron formation at 511 keV). The rectangular bar shows the energy window used for Co-57 marker in the superimposed image (Figure 3 on the right)
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F2
T2 camera) measurements were performed on the subject's hands. The gamma spectrum demonstrated an energy peak within the 500-550 keV region due to positron formation at 511 keV (Figure 2); therefore, the liquid was considered to contain F-18 (t1/2 =110 min).
The gamma camera image using high-energy collimator revealed two hot spot regions, measured at approximately 9.7 cm2 (combined area of fingers I-II) and 14.7 cm2 (wrist), respectively, based on the number of active pixels (on the left). The superimposed image (Co-57 marker pen drawing of the upper arm contours) and the actual F-18 measurement indicate the approximate location of hot spots. The images were superimposed, based on camera coordinates and the drawn hand contours on the contamination towel
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F3
The image provided by the gamma camera revealed two hot spot regions, measured to be approximately 9.7 cm2 (surface area of fingers I & II) and 14.7 cm2 (surface area of the wrist), based on the number of active pixels, respectively (Figure 3). The radionuclide activities in the left hand lesions were 19.0 kBq and 22.8 kBq, respectively, and no activity was reported in the right hand, as seen in the superimposed image (Figure 3).