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ID:41165694
大小:2.25 MB
页数:26页
时间:2019-08-18
《256层CT在冠状动脉CTA中的应用-课件,幻灯》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
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
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