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华中科技大学硕士学位论文基于飞行时间信息的平板PET图像重建姓名:智丽申请学位级别:硕士专业:生物医学工程指导教师:谢庆国20080527IPositronEmissionTomographyPETPETPETPETTimeOfFlight,TOFPETPETPETTOF30~200psTOFPETPETPETTOFPETTOFPET100ps100psTOFTOFPETPETIIAbstractPositronEmissionTomography(PET),akindofnoninvasiveimagingtechnique,canprovidethreedimensionaltomographicimagesofradiotracerdistributionanddetectthemetabolicchanges,biochemicalreactionsandfunctionofanimal/humanbody’sinternalorgansbynoninvasive,quantitativeanddynamicmethod.PanelPETemployspaneldetectorstructure.ComparingwiththeconventionalPETofringscanner,itpresentsseveraladvantagessuchaslowercost,lowercomplexityoftheinstallation,higherreliability,andtheflexiblestructurewhichpromotethedevelopmentandapplicationofpanelPET.AstheTimeOfFlight(TOF)informationbroughtin,theimagequalityofreconstructioninconventionalringPETcanbeimproved,whichhasbeencarriedoutinthecommercialPET.However,theeffectofTOFinformationonimagereconstructionofpanelPETisunclearandneedsfurtherstudy.Inthisthesis,theinfluenceofimagequalityofreconstructionwhichappliedTOFinformationhasbeendiscussesdontheassumptionthatthetimeresolutionof30~100pshasbeenacquired.First,wesetthesimulationmodelofpanelPET,selectthepropersourcefortheevaluationoftheresultsandgettheprojectiondataforthereconstructionwithTOFinformation.Weusepointsourcetotestthespatialresolution,morecomplexsourcetotestthequalityofreconstructionimages.ThenwechooseappropriateconventionalreconstructionalgorithmforpanelPETandinvestigatethealgorithmbaseonTOFinformation,analysisandevaluatethereconstructionresults.Accordingtotheresults,inthecaseoftimeresolutionaroundlessthan100ps,thespatialresolutionisgettingworsealongwithtimeresolutiongettingworse;butinthecaseoftimeresolutionaboutmorethan100ps,thespatialresolutionisbecominganinvariablevalue.Furthermore,theresultsindicatethequalityofreconstructionimagebasedonTOFinformationissuperiorconventionalreconstructionimage,ifwecangettimeresolutionthatisgoodenough.Therefore,thethesisprovesthatwecangetbetterqualityofreconstructionimagebasedonTOFinformationwithgoodenoughtimeresolution.Keywords:panelPET,TimeOfFlight(TOF)information,imagereconstruction,IIItimeresolution,spatialresolution_____111.1PETPositronEmissionTomographyPET[1]11C13N15O18F64Cu511keVγ[2]PETPETPET[3,4]PETPETPETPETPETPETPETPETPET21.2PETPET180Dγ[5]LineOfResponseLORLORPETLORLORPET[6]PET[7]FilteredBackProjectionFBP[11]θ()gRθ()gRθ()gRθ∗()gRθ∗[8][8]PET[9]PETMaximumLikelihoodExpectationMaximizationMLEMOrderedSubsetExpectationMaximizationOSEM[7][12]3[10]OSEMPET[13,14]1.3TOFPET1980AllemandTimeOfFlight,TOFPET[19]CesiumFluorideCsFTOFPETPETTOFBudinger1983PETTOFPETCsFBariumFluorideBaF2TOFPETPETTOFPETTOFPETBismuthGermanateOrthosilicateBi4Ge3O12BGOPETTOFTOFPET500ps750psTOFPET[18,19]TOFPETPET[15~16]PhotomultiplierTubePMTTOF[16,21,22](CeriumDopedLutetiumOxyorthosilicateLu2SiO5:CeLSO)[20,21]CeriumandYttriumDopedLutetiumOxyorthosilicateY:Lu2SiO5LYSO[23]LanthanumBromideLaBr3[24,25]4[24]PETTOF[21,22]PETLSO1991LSOBGO710BGOBGOPET[24]420nmPMT40ns6ns[26]TOFPET20066LYSOPET/CTGEMINITF[27]TOFPET[28]GEMINITF600psPET24[29]PETTOFPET1.4PETLOR[14]LORLORSignalNoiseRadioSNRLOR[15,16]PETLOR[17]5TOFPETLORLOR[18]TOFSNR[15]FieldOfView,FOV,[16]TOF50010-12ps12TOF34[15,16]TOFTOFPETPETTOF30~200psTOFPETTOFPET1.5PETTOFPETTOFPETPETPET6PETPETTOFTOFPETPETPETTOFTOFPET72PETPETPETPETγ2.1PETGEAdvance/DiscoveryLSPET/CTGEDLS[30]PETGEDLS200012PET/CTCTBGOPETPET2-1GEDLSPETBGO188mm4mm30mm66BlockBlock2318Module[30,31]Module2-182-1GEDLScm92.7cm15.2BGO12096mm38430Blockmm3244830Block66Block336Module23Module56GEDLSLORLOR0123456789101112131415161718192021222324252627282930313233343501234501234567891011012345678910111213141516170552-1GEDLSModuleFig.2-1TheMoudleframeofGEDLS9GATEGeant4ApplicationforTomographicEmission[27,29]GATEGeant4[33]Geant4GATEPET[34]GATEC++[36][37]GATEPETPET2-2GEDLSGATE2-2GATEGEDLSFig.2-2ThedetecterofGEDLSfromGATEsimulation10PETTrueCoincidenceScatteredCoincidenceRandomCoincidence[34]2-3123a3b123a3b2-3Fig.2-3ThethreekindsofconincidencesPETGATE2-33a3b[29]PETGEDLSPET11PETSinogram[39,40]PETLORLORLORPETSinogramSinogram2-4ABN2N1NNSinograms2N1Sinograms2-4PETFig.2-4TherebinprocessofringPET12GEDLSMaximumRingDifference1111DirectPlanes(CrossPlanes)2-51323645Span3123456712345672-5Fig.2-5ThedirectplanesandthecrossplanesMichelogram[41,42]2-6RsectorMoudleBlockCrystal11265182653518174.25mmSingle-SliceRebiningAlgorithm,SSRBMulti-SliceRebiningAlgorithmMSRBFouierRebiningAlgorithmFORE[8,43]131234567891011121314151617181234567891011121314151617182-6GEDLSMichelogramFig.2-6MichelogramofGEDLSGEDLSSSRB2-7AB2-7SSRBFig.2-7TheprincipleofSSRBSSRBLORLOR14LOR[8]GEDLSFieldofView,FOV55cmSinogram283180D3361281282.2`PETPET2.2.1402015mm33-120mm010123456789100123456789100123456789100123456789100140mm3-1PETFig3-1ThestructureofonepaneloftwopanelsPETsystemBlockBlock1.5181.51815mm3LSO11110.3mm19.998mm1111LSOBlockBlock12ModuleModuleRsector3-1153-1PETLSO484Rsectormm3402015Rsector2Modulemm3402015Module1×2Blockmm3202015Block11×11mm31.5181.518153-220mm40mm20mm3-2PETFig.3-2Thestructureoftwopanels
本文标题:硕士论文-基于飞行时间信息的平板PET图像重建
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