最新256层CT在冠状动脉CTA中的应用-课件-幻灯幻灯片.ppt

《最新256层CT在冠状动脉CTA中的应用-课件-幻灯幻灯片.ppt》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、256层CT在冠状动脉CTA中的应用-课件-幻灯Applicationof256-sliceCTincoronaryCTA2CTAwithReducedRadiationDoseCTAwithhighheartrateReducedRadiationDose64-slice:15-20mSv------750~1000Chestfilm3ReducedRadiationDose7Largercoverage:80mmForatypicalcardiacscan(120mm)Twoaxialshots3Heartbeats4-5secondscansLessvulner

2、abilitytoirregularity/arrhythmiaMorereliableperformanceinscanafterscanStep&ShootCardiacscan1Step:23256slice320slice7ReducedRadiationDoseabcdeDosereductionupto40%图像区SpiralOverscanReducedRadiationDosePatient:CT检查时条件设置Xiongshuyan,woman,46Height:162mm,Weight：52KGBMI：19.8Symptom：chestpainRad

3、iationdoseCTDIvol*ScanLength*0.0141.4mGy*11.04*0.014=0.21mSvCaseoflowdose------ProspectivelyECG-Gated5Chestfilms10Caseoflowdose------prorospectivelyECG-GatedCPRofLAD11Caseofhighheartrate------RetrospectivelyECG-GatedCPRofLCXandRCA12ReducedRadiationDoseHoeJ,TohKH.JCardiovascComputTomog.2

4、009;3:257-261.Prospective320-slicescanning13Highheartrate14AirPropelledFerryHovercraftOperationCompressedAirCushionliftstheferryabovesealevelandaconventionalmotormovesitforward0.27S14HighheartrateHoeJ,TohKH.JCardiovascComputTomog.2009;3:257-261.Scanacquisitionparameterswith256-sliceMDCT

5、HeartrateExposurecontrolExposurephasewindowDatarecomstructionmode<892-heartbeatscan10%toendofR-RintervalHalfscanreconstruction89~1332-heartbeatscan10%toendofR-Rinterval2-segmentreconstruction133~1782-heartbeatscan10%toendofR-Rinterval3-segmentreconstruction>1782-heartbeatscan10%toendofR

6、-Rinterval4-segmentreconstruction0.27S0.35S15PatientParametersofCTscanCengwen,femal,47years.symptom：discomfortinthechestCaseofhighheartrate------RetrospectivelyECG-GatedWeight：55KGHeight：160mmBMI：21.516Caseofhighheartrate------RetrospectivelyECG-GatedCPRofRCA17Caseofhighheartrate------R

7、etrospectivelyECG-GatedMPRofRCAandCTvalue18Caseofhighheartrate------RetrospectivelyECG-GatedCPRofLADCPRofLCXCPRofDCPRofPDA19PatientParametersofCTscanLiuhuizhen,femal,57years.symptom：discomfortinthechestCaseofhighheartrate------ProspectivelyECG-GatedWeight：58KGHeight：164cmBMI：21