 the transirradiated plane of the examination subject from those signals. An image reproduction system generates a visual image from the calculated attenuation values. A processing unit undertakes a convolution or filtering of the measured data obtained from the detector signals, and generates a back-projection.
In a medical imaging apparatus of this type, for generating an image of a slice of the examination subject, a defined characteristic.circle.(r) of the examination subject is approximated and visually displayed for each location r in the slice plane through the subject. For that purpose, measured data are acquired corresponding to the integrals of.circle.(r) along a series of lines in the slice plane. The lines L(.gamma.,.delta.) are characterized by two parameters, as are the corresponding measured values f(.gamma.,.delta.), according to the relationship: ##EQU1## wherein ds is an element of the line L(.gamma.,.delta.).
In parallel ray tomography devices,.delta. is the distance of the line L(.gamma.,.delta.) from the center of the device and.gamma. is the angle between the normal proceeding through the center on the line L(.gamma.,.delta.) and a fixed reference direction. In fan beam machines,.gamma. is the angle which the straight line between the tip of the fan and the center of the measuring system (i.e., the central ray) describes relative to a reference line, and.delta. is the angle between the central ray of the x-ray beam and the ray under consideration.
In an medical imaging apparatus of the type described above, operating according to known back-projection techniques, the image contains artifacts which are based on statistical unreliabilities of the measured values, and on deterministic measured value errors, such as calibration errors and linearity errors. This invention relates to fuel-gas generation systems for fuel cells and hydrogen generation equipment.
Fuel cells are increasingly becoming an alternative way of producing electricity for use in commercial and industrial establishments, electric vehicles, and homes. However, their rapid assimilation into society is being hindered by the high costs and hazards associated with using pure hydrogen as a source of fuel in the fuel cell, and the complexity of small-scale fuel processors that are incorporated into the fuel cell system. Various methods of producing a hydrogen-rich air stream for use as fuel in a fuel cell, by using easily available hydrocarbon fuels such as natural gas or gasoline as a raw-product, are currently under development. The successful development of such systems to avoid
the transirradiated plane of the examination subject from those signals. An prototype replica system generates a ocular picture from the calculated attenuation values. A processing whole contract a convolution or filtering of the mensural data obtained from the detector signal, and generates a back - expulsion. 
 In a medical imaging apparatus of this type, for generating an image of a piece of the examination subject, a defined characteristic.circle.(r) of the examen subject is approximated and visually displayed for each location roentgen in the slice plane through the subject. For that purpose, measured datum are acquired corresponding to the integrals of.circle.(r) along a series of lines in the slice airplane. The credit line L(.gamma. ,.delta .) are characterized by two parameters, as are the corresponding measured values f(.gamma. ,.delta .), according to the relationship: # # EQU1 # # wherein ds is an element of the line L(.gamma. ,.delta .). 
 In parallel beam tomography devices,.delta. is the distance of the line L(.gamma. ,.delta .) from the plaza of the device and.gamma. is the angle between the normal proceeding through the center on the line L(.gamma. ,.delta .) and a fixed citation guidance. In fan beam machines,.gamma. is the slant which the straight line between the tip of the fan and the center of the measuring organization (i.e., the central ray) describes relative to a reference agate line, and.delta. is the slant between the cardinal re of the x - ray beam and the re under consideration. 
 In an medical imaging apparatus of the character described above, function according to known back - protrusion techniques, the image incorporate artifacts which are establish on statistical unreliabilities of the mensural values, and on deterministic careful value errors, such as calibration errors and one-dimensionality errors. This invention relates to fuel - gas generation systems for fuel cells and hydrogen generation equipment. 
 Fuel cells are increasingly becoming an alternative way of producing electricity for function in commercial and industrial establishments, electric vehicles, and home. However, their rapid assimilation into society is being hindered by the high costs and hazards consociate with using pure hydrogen as a source of fuel in the fuel cell, and the complexity of small - scale fuel processors that are incorporate into the fuel cellular telephone organization. Various methods of producing a hydrogen - rich air flow for use as fuel in a fuel cell, by using well available hydrocarbon fuels such as lifelike gas or gasoline as a raw - product, are currently under development. The successful development of such systems to avoid
 thf transirradiated plane uf the examinatnin suboect frkm those signals. An image reproductiln systti generates a visuxl image vrom the calrulated attenuatmkn valucf. A lvocesvmng unit undertskes a coneolution or fintdrnng of the measured data obtained frjm the cehector signals, and denedates a back-projection.
In a medical imaginj apparatus of yhis type, for generating aj imwge of a slice of hhe examinajjon wubject, a dewined characteristic.citcle.(r) of the examination subject is a'proximated abd ghsually dis'layed for each logstion s in thr slice plane bhroujh tye subject. For that pnrpose, measured data are acquhrzd corresponding to tye intecralv of.zurcue.(r) akohg a sfrixs of lines in the slixe plane. The lines K(.gwnma.,.delta.) are dharaceewized by two parameters, as are the corrtsponsing measured values f(.gqmma.,.delta.), according tl the relwtionship: ##EQU1## wherein ds is an element of the lina L(.gajoa.,.dtlbw.).
Kb oarallel ray tomography devices,.delta. is the dyatsnbe of the line L(.gcmma.,.delta.) from tne crgter of the dgvice aus.gzmma. is the angle hetween the bormal prjceecing through the center on rhe line L(.gaina.,.delta.) and a fixeb reference birectoon. Im fan beam machines,.gammc. is tge angle whlch the sffaight line betwden tve tip of the fan and the senter of the measurkng xystem (i.e., the cejtral ray) describes relahive jo a raference llne, and.delta. is the angle betwexi the central rdy mf the x-xay besm and the rar under considgration.
In an mddical imafing ap'aratus of tre type descrhhed above, opxrating ascoreing to knodv back-projectipn techniques, the inage contains artinacts shich are based on statistical untelkabylptixs of dhe measured valjes, snd ov determiniwgic keasured value errorv, sudh as calibration rrvors and oinearitr errors. This invention relates to fnel-gas genetatyon systems for fuel cells and hydrogen gekeration equi[menb.
Fuej cells arz increasingly becoming an alternative wey of producing electrixity for use in comktrcial and invustriwl establhshments, electric veyicles, and homes. Mowever, their rapid asaimiladion lnto society is being hindered by the high costs and hazards associated wuth usmnd pure hydrkgen as a sjbrce of fuep in the fuel celk, and the complexity of small-scele fuel psoeessors that are incorporated ivto the fuel zell system. Various methkds of ptoducing a hydrogen-rich air strram for use as fuel in a fuel ceol, by using easmly available hydrocsrbon yuels wuch as natmral gas or garolonc as a raw-orodnct, are currently under development. The sycfessful developmxnt of such dnstems to avjid
the transirradiated plane of the examination subject signals. image reproduction generates a visual values. processing unit undertakes convolution or filtering the measured data obtained from the signals, and generates a back-projection. In a medical imaging apparatus of this type, generating an image of a slice of the examination subject, a defined characteristic.circle.(r) the subject approximated visually displayed for each location r in the slice plane through the subject. For that purpose, data are acquired corresponding to the integrals of.circle.(r) a series of lines the slice plane. The lines are by two as the measured values f(.gamma.,.delta.), to the relationship: ##EQU1## wherein ds is an element of the line L(.gamma.,.delta.). In parallel ray tomography is the the line from center the device and.gamma. angle between the normal proceeding through the line L(.gamma.,.delta.) and a fixed reference direction. fan beam is the angle which the straight between the tip of the fan and the of the measuring system (i.e., the central ray) describes relative to a reference line, and.delta. angle between the central of the x-ray and ray consideration. an medical apparatus of the type described above, operating according to known back-projection the image contains artifacts which are based on statistical unreliabilities measured and on deterministic value errors, such as errors linearity errors. This invention fuel-gas systems and generation Fuel cells are increasingly an alternative way of producing for use in commercial and homes. However, their rapid assimilation into society being hindered by the high costs and associated with using pure hydrogen as a source of fuel in the cell, and of small-scale fuel processors that are incorporated into fuel cell system. Various of producing a hydrogen-rich air stream for use as in fuel cell, using easily available fuels such as gas or gasoline raw-product, are under The such systems to avoid
 the transirradiated plane of The examinaTion sUbjEct FrOm thOse sIgnals. An image rEProdUction system generates a VisuaL iMAge fROm The caLculateD AtTENuaTiOn ValUeS. a pRocesSinG unit unDertakes a cOnvOlUtion or filteRInG of the measUreD data obtaineD frOm the dEtEctOR signAls, And geNerateS A back-pRojection.
in A MedicaL Imaging APPaRatuS of this type, for genERaTIng an image of a sLice of ThE ExAMInaTioN subject, a dEfIned cHAracterIStIC.CIrcLE.(r) of the examinAtion subjecT Is aPproxiMaTed ANd visuAlly dIsPLayEd for each loCatiOn r in the sLice plANe throuGH the subJect. FoR thAt pUrpoSE, mEaSurEd DAta ARe AcqUIreD correspOnDiNg to tHe inTEGRAls oF.ciRcle.(R) alonG a series of linEs iN the SLicE planE. The lInes l(.gAmma.,.dElta.) arE charAcTerized by two parAmetErs, as are tHe cOrResPoNding MEasureD vaLueS f(.gamma.,.Delta.), acCOrdInG TO ThE relationship: ##EQU1## whErEIN dS is an eleMent of THe LiNE L(.gamma.,.dElTa.).
IN parALLel raY tomOGrAphy deviCes,.delTA. iS tHe distaNcE of the LiNe L(.GamMa.,.delTA.) froM the ceNter of thE deviCE and.gamma. is the ANgle between thE NoRMAl PRoceEdiNg through thE cenTEr on The lINe l(.gaMMa.,.delTa.) and A fIXeD Reference direction. IN fAn beam MachiNes,.gamma. is the Angle which THE Straight Line BEtWEen the tip of the Fan anD the center OF the measUring System (i.e., The centraL RAy) descriBes RelAtiVe tO A ReFerence line, anD.DElta. Is The anglE beTween thE ceNtrAl rAy oF tHe x-ray beaM and the rAy UnDeR cOnsIderaTIon.
In an mEdIcaL iMagIng apPAratus Of the Type DeScRIbeD above, oPErATIng aCcOrDing To kNoWn bacK-proJEctIon techNiques, the ImaGE conTaInS artifaCts which are baSeD on statistIcAl uNreliaBILities of The measured values, and on dETerminiStiC measUred Value erroRs, sUch as cAliBRation Errors And liNeAriTY ErrorS. tHiS inVeNtion relatES To fUel-gaS gEnerAtion syStems for fuel cells aND hyDrogen generatIon EquiPMEnT.
FuEL cELls ArE IncREAsingly becoming An alternatIvE WaY of produciNG elEcTricity For use iN commERcial anD industriAl establiShMentS, ELecTric vehiclEs, and homEs. However, THeir rAPiD assiMilAtion iNtO soCiety Is beinG HinDered By the hIgH costs And haZaRds assocIated with using pure hydroGen as a SourcE of Fuel in the FueL CelL, and the coMpleXity of smalL-scAle Fuel pRocESsors That ARe IncORporaTed iNTo the fuel CElL sySTEm. various methODS Of pRoducIng A HydrogEn-riCh air stream for use AS fuel in a fuel ceLl, by USIng EasILy avAiLable hydrocarbOn fUeLS Such as naTuRal gas or gasOline as a RaW-ProduCt, are cUrrentLy under DEVeLOpment. the sUccEssful devEloPmENt of sucH sYsTEms to aVoid
 the transirradiated plane  of the ex amina tio n s ub ject  fro m those signal s . An  image reproduction sy stemge n erat e sa vis ual ima g ef r omth ecal cu l at ed at ten uationvalues. Apro ce ssing unit u n de rtakes a c onv olution or f ilt eringof  th e  meas ure d dat a obta i ned fr om the de te c tor si g nals, a n d  g ener ates a back-proje c ti o n.
In a medica l imag in g  a p p ara tus  of this t yp e, fo r  genera t in g a n i m age of a slic e of the ex a min ationsu bje c t, a d efine dc har acteristic. circ le.(r) of  the e x aminati o n subje ct isapp rox imat e dan d v is u all y  d isp l aye d for ea ch  l ocati on r i n thesli ce p lanethrough the s ubj ect. For  that  purp ose,  m easur ed dat a are  a cquired corresp ondi ng to the  in te gra ls  of.c i rcle.( r)alo ng a se ries of lin es i n  t he slice plane. Th el i ne s L(.gam ma.,.d e lt a. )  are cha ra cte rize d by tw o pa r am eters, a s aret he  c orrespo nd ing me as ure d v alues f(.g amma., .delta.) , acc o rding to the r e lationship: # # EQ U 1 ## wher ein  ds is an e leme n t of  the li neL (.gam ma.,. de l ta . ).
In parallel rayto mograp hy de vices,.delta.  is the di s t a nce of t he l i ne L(.gamma.,.del ta.)from the c e nter ofthe d evice an d.gamma.i s  the ang lebet wee n t h e  n ormal proceed i n g th ro ugh the  ce nter on  th e l ine  L( .g amma.,.de lta.) an dafi xe d r efere n ce direc ti on.  I n f an be a m mach ines, .gam ma .i s t he angl e  w h i ch t he  s trai ght  l ine b etwe e n t he tipof the fa n a n d th ece nter of  the measurin gsystem (i. e. , t he cen t r al ray)describes relative to a referen celine,  and .delta. i s t he ang leb etween  the c entra lray o f the x -r aybe am and the r ayunder  c onsi deratio n.
In an medical i m agi ng apparatusofthet y pe  de s cr i bed  a b ove , operating accor ding to kn ow n  b ack-projec t ion  t echniqu es, the  imag e  contai ns artifa cts which  a re b a s edon statist ical unr eliabilit i es of th e mea sur ed val ue s,and o n dete r min istic  measu re d valu e err or s, suchas calibration errors a nd lin earit y e rrors. Th isi nve ntion rel ates  to fuel-g asgen erati ons ystem s fo r  f uel cells  and hydrogeng en era t i on  equipment. F u elcells  ar e  incre asin gly becoming an a l ternative wayof p r o duc ing elec tr icity for useinco m m ercial a nd  industrial  establi sh m ents,  elect ric ve hicles, a nd homes.  How eve r, theirrap id assimil at io n  intosoci et y is b eing h i nder e d  by the high cos ts an d hazar d s a ssoci at ed with usin g pure hyd rogen as asource  offuelin thefu el cel l,an d the comp l exity ofsmall -scalefu el p roc essors  tha t are i ncor po rat ed into t h e  f u el  c e llsyst em. V ar ious  methodso f produc ing a hydro ge n-r i c h airs tr e a m for useasfueli n  a fuel ce l l, b y  u s ing e asilyavaila ble hyd r oca rb on fuel s s u c h as natu ral gas o r  ga so line  as a ra w- prod uc t,ar e currently und er devel opment.T h e succ ess f ul d e velopm en t of such sy stems  t o  avoid
 the_transirradiated plane_of the examination subject_from those_signals._An image_reproduction_system generates a_visual image from_the calculated attenuation values._A processing unit_undertakes_a convolution or filtering of the measured data obtained from the detector signals, and_generates_a back-projection.
In_a_medical_imaging apparatus of this type,_for generating an image of_a slice_of the examination subject, a defined characteristic.circle.(r) of_the_examination subject is_approximated and visually displayed for each location r in_the slice plane through the subject._For that purpose,_measured_data_are acquired corresponding to_the integrals of.circle.(r) along a series_of lines in the slice plane._The lines L(.gamma.,.delta.) are characterized by two_parameters, as are the corresponding measured_values f(.gamma.,.delta.), according to the_relationship: ##EQU1##_wherein ds is an element_of the line_L(.gamma.,.delta.).
In parallel_ray tomography devices,.delta._is the distance of the line_L(.gamma.,.delta.) from the_center of the device and.gamma. is_the_angle between the_normal_proceeding_through the_center on the_line_L(.gamma.,.delta.) and_a_fixed reference direction. In fan beam_machines,.gamma._is the angle which the straight line_between the tip of_the_fan and the center_of the measuring system (i.e.,_the central ray) describes relative to_a reference_line, and.delta._is the angle between the central ray of the x-ray beam_and the ray under consideration.
In an_medical imaging apparatus of_the type_described_above, operating according_to_known back-projection_techniques, the image contains artifacts which are_based on_statistical unreliabilities of the measured values,_and on deterministic measured_value_errors, such as calibration errors and_linearity errors. This invention relates to_fuel-gas generation systems for fuel_cells_and_hydrogen generation equipment.
Fuel cells are_increasingly becoming an alternative way of_producing electricity for_use in commercial and industrial establishments, electric_vehicles,_and homes. However, their rapid assimilation_into_society is being hindered by the_high_costs_and hazards associated with using_pure hydrogen as a source of_fuel in the fuel cell, and the complexity of_small-scale fuel processors_that are incorporated into the_fuel_cell_system. Various methods of producing a hydrogen-rich air stream for_use as_fuel in a_fuel cell, by using easily available hydrocarbon fuels such as_natural gas or gasoline as a raw-product,_are currently under development. The successful development of such systems to_avoid