最新image generation in ct - konradreview：在ct图像生成konradreview.com教学讲义ppt.ppt

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1、imagegenerationinct-konradreview：在ct图像生成konradreview.comPROTOCOLANDTECHNIQUESELECTIONPROTOCOLPARAMETERSSCANNINGMODEkVpmATimeRECONSTRUCTIONPATIENTPOSITIONPATIENTORIENTATIONSFOVDFOVPROTOCOLPEDIATRICORADULTHEAD,ABDOMEN,EXTREMITIESVASCULARORREGULARPATIENTPOSITIONSUPINEORPRONEBODY

2、PARTUNDERSCRUTINYMUSTBEPLACEDINTHEISOCENTEROFTHESCANNERPATIENTORIENTATIONHEADFIRSTFEETFIRSTSFOVSCANNINGFIELDOFVIEW(CALLIBRATIONFIELDOFVIEW)AREAWITHINTHEGANTRY’SISOCENTERFROMWHICHTHERAWDATAISACQUIREDDURINGTHESCAN.ITDEPENDSONTHENUMBEROFDETECTORSACTIVATEDTOCOLLECTDATA.LARGESFOV

3、SMALLSFOVSMALLSFOVSFOVLARGESFOVSFOVCHOOSETHESMALLESTSFOVTHATWOULDACCOMMODATEBODYPARTFORBESTRESOLUTIONIFBODYPARTLIESOUTSIDESFOVNODATAWILLBECOLLECTEDFORTHATPARTTHATEXTENDBEYOND.ITALSOCAUSESOUTOFFIELDARTIFACTOUTOFFIELDARTIFACTDFOV–DISPLAYEDFIELDOFVIEW(ZOOMORTARGET)DETRMINESHOWM

4、UCHRAWDATAFROMWITHINSFOVWILLBEUTILIZEDTOCREATEANIMAGE.SFOVDFOVDISPLAYEDFOVvsSCANNINGFOVDFOVCANBEEQUALORLESSOFSFOVDFOVVSPIXELSIZESMALLDFOVLARGEFOVSMALLPIXELLARGEPIXELLARGEDFOVLOWSPATIALRESOLUTIONLOWVISIBILITYOFDETAILLARGEDFOVSMALLDFOVDFOVDFOVPIXELSIZEPIXELSIZE=DFOV(mm)/MATRI

5、XSIZESAMPLESCANNINGTOPOGRAMREGULARSCANTOPOGRAM(SCOUT)TUBEDOESNOTREVOLVEAROUNDTHEPATIENTAPSCOUTTUBESUSPENDEDABOVEPATIENTDURINGSCOUTGENERATIONTUBELATSCOUTTUBEATTHE90ºANGLETOPATIENTREGULARSCANI,II,ANDIIIGENERATIONCONTINUOUSDATAACQUSITIONGEOMETRYIVGENERATIONSTATIONARYDATAACQUSITI

6、ONGEOMETRYREGULARSCANAXIAL(CONVENTIONAL,SLICE-BY-SLICE)SPIRALAXIALSCANTABLESTOPSATTHESCANNINGPOSITIONANDTHETUBEROTATESAROUNDAPATIENT.SPIRALPATIENTCONTINUOUSLYMOVESINTHEZ-AXISDIRECTIONWHILETHETUBEROTATESAROUND.TOTALNUMBEROFTRANMISSIONMEASUREMENTEQUALSNUMBEROFVIEWSXNUMBEROFR

7、AYSINEACHVIEWACQUSITIONTERMINOLOGYRAYVIEWPROFILERAYPARTOFTHEX-RAYBEAMTHATFALLSONONEDETECTORVIEWCOLLECTIONOFTHERAYSFORONETRANSLATIONACROSSTHEOBJECTPROFILEANALOGSIGNALGENERATEDINAVIEWRAYPROFILEVIEWRECONSTRUCTIONDATATHATHAVEBEENBACKPROJECTEDINTOTHEIMAGEMATRIXTOCREATECTIMAGESDISP

8、LAYEDONTHEMONITORRECONSTRUCTIONTRANSMISSIONMEASUREMENT(LINEARATTENUA