层ct在冠状动脉cta中的应用课件幻灯

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1、Applicationof256-sliceCTincoronaryCTAApplicationof256-sliceCTincoronaryCTA2CTAwithReducedRadiationDoseCTAwithhighheartrateReducedRadiationDose64-slice:15-20mSv------750~1000Chestfilm3ReducedRadiationDoseReportedeffectiveradiationdosageinrecentstudieswiththeuseof64–detectorrowCThave

2、rangedfrom9.5to21.4mSv,morethanthepreviouslyreportedd-osesfrom16–detectorrowCTstudies.JamesP,EliseL,BruceA,etal.ProspectivelyGatedTransverseCoronaryCTAngiographyversusRetrospectivelyGatedHelicalTechnique:ImprovedImageQualityandReducedRadiationDose.Radiology2008;246:742-75316-detect

3、or64-detector256-detectorMoredoseage？Moredoseage√4ReducedRadiationDose530-46%12-24%17-33%80%3multipleDoseWiseprovedNew32-40%5ReducedRadiationDoseRetrospectivelyECG-triggeredscanProspectivelyECG-triggeredscanProspectivelygatedtransverseCTtechniquerepresentsan83%reductionascomparedwi

4、ththatforthegroupwiththeretrospectivelygatedhelicaltechnique。JamesP,EliseL,BruceA,etal.ProspectivelyGatedTransverseCoronaryCTAngiographyversusRetrospectivelyGatedHelicalTechnique:ImprovedImageQualityandReducedRadiationDose.Radiology2008;246:742-7536ReducedRadiationDose7Largercovera

5、ge:80mmForatypicalcardiacscan(120mm)Twoaxialshots3Heartbeats4-5secondscansLessvulnerabilitytoirregularity/arrhythmiaMorereliableperformanceinscanafterscanStep&ShootCardiacscan1Step:23256slice320slice7ReducedRadiationDoseabcdeDosereductionupto40%图像区SpiralOverscanReducedRadiationDose

6、Patient:CT检查时条件设置Xiongshuyan,woman,46Height:162mm,Weight：52KGBMI：19.8Symptom：chestpainRadiationdoseCTDIvol*ScanLength*0.0141.4mGy*11.04*0.014=0.21mSvCaseoflowdose------ProspectivelyECG-Gated5Chestfilms10Caseoflowdose------prorospectivelyECG-GatedCPRofLAD11Caseofhighheartrate------R

7、etrospectivelyECG-GatedCPRofLCXandRCA12ReducedRadiationDoseHoeJ,TohKH.JCardiovascComputTomog.2009;3:257-261.Prospective320-slicescanning13Highheartrate14AirPropelledFerryHovercraftOperationCompressedAirCushionliftstheferryabovesealevelandaconventionalmotormovesitforward0.27S14Highh

8、eartrateHoeJ,TohKH.JCardio