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积水潭膝关节MRI.ppt

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积水潭膝关节MRI.ppt
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Practical Interpretation of Knee MRI,Routine MRI protocol,Sagittal,Coronal,Axial Spin echo(SE) FSE,STIR T1, T2, PD,JST,Coronal: T2FFE T2 STIR Saggital: T1 T2 T2FFE T2 STIR,TR和TE决定成像加权,短TE 长TE 短TR T1 无用途 长TR PD T2,,,,,T1 weighted image (TR1000msec,TE40msec)“anatomy”,T2 weighted image (TR1500msec,TE60msec)“pathology”,,Fat suppressionChemical saturationShort tau inversion recovery (STIR),Tissue characterization,T1 T2 Adipose tissue Fat white grayYellow marrow Water dark white Cortical bone black black Cartilage gray gray Tendon / ligament/meniscus black/gray black/gray Muscle gray gray Hematoma white white Chronic hemorrhage dark dark,,Anterior Cruciate Ligament,extension ER 15°— 20°,Normal MR appearance,direct sign of torn ACL,discontinuity,abnornal orientation (fallen ACL),nonvisualization,Avulsion fx,Indirect,Bone bruise sign Deep sulcus sign Segond fx generalized increase in signal intensity thickness increase Anterior drawer sign Acute hemarthrosis Buckling of PCL,,pivot-shift pattern,,,Kissing sign,,Segond sign,,Deep sulcus sign, 2mm,generalized increase in signal intensity thickness increase,,Buckling of PCL,nonspecific,Ant.drawer sign,Associated soft tissue injuries,Posterior horn of medial meniscus Bucket handle tear MCL,Posterior Cruciate Ligament,Normal MR appearance,Meniscus-Femoral ligament,Primary sign of PCL,complete tear partial tear “peel off ” injury,Complete tear,Grade1,Grade3,Grade2,,,,partial tear,Secondary sign of PCL injury,bone marrow edema(BME) avulsion fx,Dashboard injury sign,Bone Marrow Edema,,Tibial avulsion fx,Associated ligament injury,ACL injury MCL injury PLC/LCL injury,Collateral ligament,Normal Anatomy of MCL
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