基于动态体模的ct时间分辨力的测试方法分析与实践

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1、ABSTRACTdesigningandproducingthecorrespondingphantomandachievingthemeasurementofCTtemporalresolution．Firstly,thepaperdescribedthedesignandproductionofCTtemporalresolutiondynamicphantom，thedesignoftheshapeoftemporalresolutiondynamicphantomwasbasedontheCatphan500phantoms(whic

2、hWasproducedbyUnitedStatesofAmericanphantomlaboratorythatCanbeusedtoevaluatetheperformanceofCT)andthemeasurementprincipleofCTtemporalresolution．Theshapeoftemporalresolutionphantomiscylinder,thediameteris15cm，thethicknessis5cmandthematerialispolymethylmethacrylate(PMMA)．Thet

3、wohi【ghdensityattenuationobjectsarestainlesssteelwireandaluminumwirewhichareatthedistanceofthecenterofcylinder3cmand5cmrespectively,andthediametersofthetwoare3mm．ThetemporalresolutionphantomCanberotatedwhenitWasdrivenbythetwophrasesfourwireshybridsteppermotorandthedriveofst

4、eppermotoradoptedbythemethodofthecombinationofsoftwareandhardwire，thecontrolsystemofsteppermotorismadeofMCUSTC12C2052ADwhichproducedbyHongJingtechnologyanddrivechipTHB6064HwhichproducedbyToshiba．Thatis，thisphantomWasdesignedtoimplementmovementlikecircularbyPCcontrolandthesp

5、eedoftemporalresolutionphantomwascontrolledbypulsefrequencyandthedirectionrotationwasasthesameofCTgantry．Secondly,weanalyzedtherelationshipbetweentemporalresolutionandcardiacimaging，andpointedoutthathighorlowoftemporalresolutionaffecteddirectlythequalityofcardiacimagingandt

6、hemedicaldiagnosislevel，therefore，theresearchontemporalresolutionisveryimportanttoimprovemedicaldiagnosislevel；atthesametime，thepaperexploitedtheprincipleofthethirdgenerationCTringartifactcreation，inthe“rdgenerationCT,ifone(ormore)detector(s)is(are)abnormal，itwillproducerin

7、gartifact(s)onthereconstructionimages．Accordingtotheprinciple，thetemporalresolutionphantomcontaininghi曲densityattenuationobjectswasrotatedatthesamespeedanddirectionasthegantry,creatingpartialringartifact，wheretheangularextentofringartifactprovidesadirectindicationofthetempo

8、ralresolution；thenthepaperintroduceddataacquisitionequipmentandphantomspeedverific