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ID:39508219
大小:785.11 KB
页数:5页
时间:2019-07-04
《Attenuation Correction of SPECT Using X-Ray CT on an Emission-Transmission CT》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、AttenuationCorrectionofSPECTUsingX-RayCTonanEmission-TransmissionCTSystem:MyocardialPerfusionAssessmentS.C.Blankespoor,X.Wu,K.Kalki,J.K.Brown,C.E.Cann,andB.H.HasegawaUniversityofCaliforniaatSanFranciscoAbstractTheSPECTimageisacquiredwithascintillationcamera.Imagemisregist
2、rationisminimizedbyplacingthetwoWepresentexperimentalresultsforattenuationcorrectionimagingscannersadjacenttooneanothersothattheemissionofemissiontomographythroughuseofanattenuationmapandtransmissionimagesareacquiredwithoutremovingthederivedfromX-rayCTdata.BoththeX-rayand
3、gamma-raypatientfromthetablebetweenthetwoscans.Wereportheredatawereobtainedonaprototypeemission-transmissiontheresultsobtainedusingthissystem,withitsattenuationimagingsystem(“X-SPECT”)whichincorporatesathird-correctioncapabilities,formyocardialperfusionassessmentgeneratio
4、nX-rayCTscannerandasingle-headedSPECTinpigs.scanner.ThetwocommercialimagingdevicesarejuxtaposedsuchthattheCTtablecanmovethepatient11.SYSTEMDESIGNdirectlyintotheSPECTscanneraftertheX-rayscan.ThisenablessystematicregistrationofSPECTandX-rayCTOurcombinedX-SPECTimagingsystemi
5、sshowninimages.Tocalibrateattenuationmapcreation,asetofCTFigure1.NotetheadjacentpositionsofthetwocommercialscansforaspecificphantomgeometryandX-raytechniquescanners.Thescannersshareasingletabletoprecludethewereacquired,withvaryingattenuatingmaterialsineachneedformovementb
6、ythepatientbetweenSPECTandX-rayscan.ApiecewiselinearfitwasappliedtotheCTnumbersCTscans.Registrationofimagesfromthetwomodalitiesisandknownattenuationcoefficientsat140keV,andtheresultsimplifiedbythesharedtableandknownsystemgeometry.isusedtocreateattenuationmapsat140keVfromg
7、ivenCTThejuxtapositionofourSPECTscannerandCTscannerimages.ThistechniquehasbeenappliedtosmallpigsinresultsintheexposureofourSPECTscannertoasignificantmyocardialperfusionstudies.CorrectingforattenuationfluxofscatterfromtheCTscanner.Wehave,however,increasedtheimage-derivedmy
8、ocardialradionuclidemeasuredthisscatterfluxunderextremeX-rayCToperatingconcentrationvaluesfrom16
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