Transcription of Gradient echo法の基礎 - UMIN
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Gradient echo法の基礎 - UMIN
Gradient echo Kitasato University HospitalGRE Kitasato University Hospital GRE GRE Kitasato University HospitalGRE T2* inflow effect TR,TE Kitasato University Hospital GsGpGread GRE PSD(Pulse Sequencediagram)TRTERFFID FID Kitasato University Hospital90 GsGpGread90 SE PSD TRTERF180 MRI GRE PSD SE PSD 180 FID Kitasato University Hospital TR : repetition time T1 TR 100ms TR 50msTE : echo time T2 TE15 25ms TE5 10msFA : flip angle FA70 110 FA5 20 GRE TR TE FA MRI Catherine Westbrock Kitasato University HospitalTR TE FA GRE (FA= )SGRE =1-exp(-TR/T1) exp(-TE/T2*)K f(v) sin 1-cos exp(-TR/T1) M0 Mxy=M0 sin Mz=M0 cos T1 T2* T1 Mz Mxy sin K f(v) Kitasato University HospitalTR TE FA FA ( 90 )SGRE =1-exp(-TR/T1) exp(-TE/T2*) sin 1-cos exp(-TR/T1)cos 0 sin 1 SE T2 T2* SSE =K f(v) 1-exp(-TR/T1) exp(-TE/T2)TR TE T2* TR TE T1 TR TE FA ( 90 )GRE (FA=90 )SGRE =K f(v) 1-exp(-TR/T1) exp(-TE/T2*)TR TE FA Kitasato University HospitalK
・長いTR ＞100ms ・短いTR ＜50ms TE : echo time →T 2＊緩和と深い関係 ・長いTE 15〜25ms ・短いTE 5〜10ms FA : flip angle ・大きいFA 70°〜110° ・小さいFA 5°〜20° GRE法のコントラストはTR、TE、FAと臓器の緩和 とが関連して導かれる→複雑なコントラスト
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