層CT在冠狀動(dòng)脈CTA中的應(yīng)用課件幻燈

Applicationof256-sliceCTincoronaryCTAApplicationof256-sliceCTApplicationof256-sliceCTincoronaryCTA2CTAwithReducedRadiationDoseCTAwithhighheartrateApplicationof256-sliceCTinReducedRadiationDose364-slice:15-20mSv------750~1000ChestfilmReducedRadiationDose364-slic4ReducedRadiationDoseReportedeffectiveradiationdosageinrecentstudieswiththeuseof64–detectorrowCThaverangedfrom9.5to21.4mSv,morethanthepreviouslyreportedd-osesfrom16–detectorrowCTstudies.JamesP,EliseL,BruceA,etal.ProspectivelyGatedTransverseCoronaryCTAngiographyversusRetrospectivelyGatedHelicalTechnique:ImprovedImageQualityandReducedRadiationDose.Radiology2008;246:742-75316-detector64-detector256-detectorMoredoseage？Moredoseage√4ReducedRadiationDoseReporte5ReducedRadiationDose530-46%12-24%17-33%80%3multipleDoseWise

proved

New32-40%5ReducedRadiationDose530-46%6ReducedRadiationDoseRetrospectivelyECG-triggeredscanProspectivelyECG-triggeredscanProspectively

gatedtransverseCTtechniquerepresentsan83%reductionascomparedwiththatforthegroupwiththeretrospectivelygatedhelicaltechnique。JamesP,EliseL,BruceA,etal.ProspectivelyGatedTransverseCoronaryCTAngiographyversusRetrospectivelyGatedHelicalTechnique:ImprovedImageQualityandReducedRadiationDose.Radiology2008;246:742-7536ReducedRadiationDoseRetrosp7ReducedRadiationDose7Larger

coverage:80mmForatypicalcardiacscan(120mm)Twoaxialshots3Heartbeats4-5secondscansLessvulnerabilitytoirregularity/arrhythmiaMorereliableperformanceinscanafterscanStep&ShootCardiacscan1Step:23256slice320slice7ReducedRadiationDose7LargerReducedRadiationDose

a b c d e

Dosereductionupto40%圖像區(qū)SpiralOverscanReducedRadiationDosea ReducedRadiationDoseReducedRadiationDose10Patient:CT檢查時(shí)條件設(shè)置Xiongshuyan,woman,46Height:162mm,Weight：52KGBMI：19.8Symptom：chestpainRadiationdoseCTDIvol*ScanLength*0.0141.4mGy*11.04*0.014=0.21mSvCaseoflowdose------ProspectivelyECG-Gated5Chestfilms10Patient:CT檢查時(shí)條件設(shè)置Xiongshu11Caseoflowdose------prorospectivelyECG-GatedCPRofLAD11Caseoflowdose------proros12Caseofhighheartrate------RetrospectivelyECG-GatedCPRofLCXandRCA12Caseofhighheartrate-----13ReducedRadiationDoseHoeJ,TohKH.JCardiovascComputTomog.2009;3:257-261.Prospective320-slicescanning13ReducedRadiationDoseHoeJ,14Highheartrate14AirPropelledFerryHovercraft

OperationCompressedAirCushionliftstheferryabovesealevelandaconventionalmotormovesitforward0.27S14Highheartrate14AirPropell15HighheartrateHoeJ,TohKH.JCardiovascComputTomog.2009;3:257-261.Scanacquisitionparameterswith256-sliceMDCTHeartrateExposurecontrolExposurephasewindowDatarecomstructionmode<892-heartbeatscan10%toendofR-RintervalHalfscanreconstruction89~1332-heartbeatscan10%toendofR-Rinterval2-segmentreconstruction133~1782-heartbeatscan10%toendofR-Rinterval3-segmentreconstruction>1782-heartbeatscan10%toendofR-Rinterval4-segmentreconstruction0.27S0.35S15HighheartrateHoeJ,TohKH16PatientParametersofCTscanCengwen,femal,47years.symptom：

discomfortinthechestCaseofhighheartrate------RetrospectivelyECG-GatedWeight：55KGHeight：160mmBMI：21.516PatientParametersofCTsca17Caseofhighheartrate------RetrospectivelyECG-GatedCPRofRCA17Caseofhighheartrate-----18Caseofhighheartrate------RetrospectivelyECG-GatedMPRofRCAandCTvalue18Caseofhighheartrate-----19Caseofhighheartrate------RetrospectivelyECG-GatedCPRofLADCPRofLCXCPRofDCPRofPDA19Caseofhighheartrate-----20PatientParametersofCTscanLiuhuizhen,femal,57years.symptom：

discomfortinthechestCaseofhighheartrate------ProspectivelyECG-GatedWeight：58KGHeight：164cmBMI：21.620PatientParametersofCTsca21Caseofhighheartrate------ProspectivelyECG-GatedCPRofLCX21Caseofhighheartrate-----22Caseofhighheartrate------ProspectivelyECG-GatedCPRofLCXCPRofLADCPRofMCPRofD22Case