256层CT在冠状动脉CTA中的应用-课件，幻灯

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1、Applicationof256-sliceCTincoronaryCTAApplicationof256-sliceCTincoronaryCTA2CTAwithReducedRadiationDoseCTAwithhighheartrateReducedRadiationDose364-slice:15-20mSv------750~1000Chestfilm4ReducedRadiationDoseReportedeffectiveradiationdosageinrecentstudieswiththeuseof64–detec

2、torrowCThaverangedfrom9.5to21.4mSv,morethanthepreviouslyreportedd-osesfrom16–detectorrowCTstudies.JamesP,EliseL,BruceA,etal.ProspectivelyGatedTransverseCoronaryCTAngiographyversusRetrospectivelyGatedHelicalTechnique:ImprovedImageQualityandReducedRadiationDose.Radiology20

3、08;246:742-75316-detector64-detector256-detectorMoredoseage？Moredoseage√5ReducedRadiationDose530-46%12-24%17-33%80%3multipleDoseWiseprovedNew32-40%6ReducedRadiationDoseRetrospectivelyECG-triggeredscanProspectivelyECG-triggeredscanProspectivelygatedtransverseCTtechniquere

4、presentsan83%reductionascomparedwiththatforthegroupwiththeretrospectivelygatedhelicaltechnique。JamesP,EliseL,BruceA,etal.ProspectivelyGatedTransverseCoronaryCTAngiographyversusRetrospectivelyGatedHelicalTechnique:ImprovedImageQualityandReducedRadiationDose.Radiology2008;

5、246:742-7537ReducedRadiationDose7Largercoverage:80mmForatypicalcardiacscan(120mm)Twoaxialshots3Heartbeats4-5secondscansLessvulnerabilitytoirregularity/arrhythmiaMorereliableperformanceinscanafterscanStep&ShootCardiacscan1Step:23256slice320sliceReducedRadiationDoseabcdeDo

6、sereductionupto40%图像区SpiralOverscanReducedRadiationDose10Patient: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-Gated5Chestfilms11Caseoflowdo

7、se------prorospectivelyECG-GatedCPRofLAD12Caseofhighheartrate------RetrospectivelyECG-GatedCPRofLCXandRCA13ReducedRadiationDoseHoeJ,TohKH.JCardiovascComputTomog.2009;3:257-261.Prospective320-slicescanning14Highheartrate14AirPropelledFerryHovercraftOperationCompressedAirC

8、ushionliftstheferryabovesealevelandaconventionalmotormovesitforward0.27S15HighheartrateHoeJ,TohKH.JCard