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ID:34156765
大小:14.91 MB
页数:57页
时间:2019-03-04
《基于动态体模的ct时间分辨力的测试方法分析与实践》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
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
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