Transcription of （5）撮像法の種類と特徴 - AIST
1 O . T1,T2,T2*). T1,T2,T2*). T1). D). 1.. 1H PD .. 13C T1 .. 19F FID T2 . = 23Na echo T2* .. 31P D MRS .. echo T1 T2 FT . FID T FT . echo D FT . FID T (T2) FT . FID T2 FT . P FID PD . 2. o . 3.. TE . TE=0 .. TE = 8msec TE 4. T1,T2,T2*). 5. IR T1 .. RF. G .. G . Gr .. TI TE/2 TE/2 . TI: TE. TE: TR. TR: 6. T1 . 100. B T1=1000msec, =100 . A T1=300msec, =50 . 50.. 0. 0 500 1000 1500 2000 70 2500. 60. -50.. 50. 40. -100 30 A B. 20. 10. 0. 0 500 1000 1500 2000 2500 3000. A B TI. FLAIR fluid attenuated inversion recovery . null point . STIR Short TI Inversion Recovery . T 7. SE T . 180 . 90 180 . RF. Gs . Gp .. Gr . Signal . (TE/2) (TE/2). TE: . TR: .. 8. T2 Weighted MRI of a Rat Head TR = 2748msec (Spin Echo). TE = 8msec TE = 34msec TE = 59msec TE = 84msec T2 . T2 . 9. TE. T2).
2 A B A B A B .. T2). B. A. TE =>T2 .. TE 10.. GRE. TR/TE/FA=243 FOV=400 300. TH= NEX=1 256 230. 11. T1,T2,T2*,D). 12.. SE IR . TE TR . RF .. , . , Spiral Scan FFE, FAST BURST Singleshot-SE. CE-FAST GRASE. snapshot-FLASH with/without MP-RAGE Half Fourier . Keyhole imaging . Zero Filling . 13. Segmented imaging . GRE .. RF.. Gs . Gp . Gr .. TE,TR . 14. TE,TR . 15. 90 . RF.. Gs N . Gp . Gr . Signal N .. 16.. 90 . RF. Gs .. G1.. G2. 255. Signal . 0. -255 0 255.. -255. 17.. ( . 18. T1). 19. MRA (MR Angiography). In/out of flow Time of Flight . Tm .. L.. = 1 V TR/. = 1 V TR/ -V TE/2L . -V TE/2L l VV ==ll // Tm Tm (Phase Contrast).. Gb .. tb dephasing VENC. -Gb =- VENC : velocity encoding . 20. =- .. (PC ).. 90 RF pulse 180 RF pulse RF. MPG MPG. Slice Selection Gs Phase encoding Gp Frequency encoding Gr Spin Echo Signal Acquisition Signal (TE/2) (TE/2).
3 velocity encoding . 21. MRA Magnetic MRA MagneticResonalce ResonalceAngiography . Angiography . flow imaging .. 22. D). 23. Motion Probing Gradient (MPG) . MPG 180 pulse MPG. GM GM. time .. phase D=0. D 0. I = I 0 exp( Db). b = . x , y , z ) .. / 3 . 24. MPG(Motion Probing Gradient) . T2 Relaxation Diffusion & T2 Relaxation MPG applied Image Intensity A. A T2 Weighted Image D. B. B Diffusion Weighted Image time 25. (SE-DWI). 90 RF pulse 180 RF pulse RF. MPG MPG. Slice Selection Gs Phase encoding Gp Frequency encoding Gr . Spin Echo Signal Acquisition Signal (TE/2) (TE/2).. 26. RF pulse RF pulse RF. MPG MPG. Slice Selection Gs Phase encoding Gp Frequency encoding Gr Signal . t TE/2. TR. A Pulse Sequence for Two-Dimensional Echo Planar Diffusion Weighted MR. imaging (EPI-DWI).
4 27. MR Angiography . Diffusion & Perfusion imaging .. Mx D11 D12 D13 GMX. My = k D21 D22 D23 GMy 28. Mz D31 D32 D33 GMz
