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第18回関西Gyro Meeting - kansaigyro.web.fc2.com

18 gyro Meeting Philips Electronics Japan MR Application Specialist Tomohiro Mochizuki VCG/PPU Respiration VCG/PPU Phase Contrast Balanced-TFE Time OF Flight TRANCE VCG/PPU Respiration VCG/PPU VCG/PPU Gate sweep TRANCE PCA CINE b-TRANCE or TR t=0 t=t+TR v=0 slice d slice d slice d v= d/ 2TR v d/TR FFE MRA(Gate sweep) 2D TOF SNR 3D TOF Body M2D TOF 70 slices 4stacks .8 x .8x 4 mm TE : Achieva TRANCE FBI Q-Flow 1R-R TRANCE FBI Inflow Velocity Inflow Inflow Velocity Inflow Non Gate Gate TRANCE FBI TRANCE FBI Courtesy : Utsunomiya Central Clinic Inflow Phase Contrast Balanced-TFE Time OF Flight TRANCE VCG/PPU Respiration VCG/PPU VCG/PPU Gate sweep TRANCE PCA CINE b-TRANCE systole diastole Artery Vein Artery Vein 200 400 600 800 200 400 600 800 (time) (time) Velocity Signal Intensity.

systole diastole Artery Vein Artery Vein 200 400 600 800 200 400 600 800 (time) (time) ty ty ・ 心電図同期を使用する ・ 心周期に依存した信号強度に基づく

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Transcription of 第18回関西Gyro Meeting - kansaigyro.web.fc2.com

1 18 gyro Meeting Philips Electronics Japan MR Application Specialist Tomohiro Mochizuki VCG/PPU Respiration VCG/PPU Phase Contrast Balanced-TFE Time OF Flight TRANCE VCG/PPU Respiration VCG/PPU VCG/PPU Gate sweep TRANCE PCA CINE b-TRANCE or TR t=0 t=t+TR v=0 slice d slice d slice d v= d/ 2TR v d/TR FFE MRA(Gate sweep) 2D TOF SNR 3D TOF Body M2D TOF 70 slices 4stacks .8 x .8x 4 mm TE : Achieva TRANCE FBI Q-Flow 1R-R TRANCE FBI Inflow Velocity Inflow Inflow Velocity Inflow Non Gate Gate TRANCE FBI TRANCE FBI Courtesy : Utsunomiya Central Clinic Inflow Phase Contrast Balanced-TFE Time OF Flight TRANCE VCG/PPU Respiration VCG/PPU VCG/PPU Gate sweep TRANCE PCA CINE b-TRANCE systole diastole Artery Vein Artery Vein 200 400 600 800 200 400 600 800 (time) (time) Velocity Signal Intensity.

2 3D TSE t=0 t=t+TR v=0 slice d slice d slice d v= d/ 2TR v d/TR FFE 180 t=TE/2 90 t=0 SE v=0 v= d/TE v 2 d/TE slice d slice d slice d TRANCE Flow void TRANCE FBI Artery Vein 200 400 600 800 (time) Signal Intensity TRANCE FBI MIP TRANCE FBI Q-Flow TRANCE FBI Q-Flow Q-Flow Longest TRANCE FBI Q-Flow PPU Q-Flow Longest MRA TRANCE TR shot duration STIR TR shot duration STIR TR beat 3D T2W TR TR 2beat 2 IR HR 2 TR 2beat TR 2beat 1R-R 2R-R TR shot duration STIR systole diastole Artery Vein 200 400 600 800 (time) HR60 systole diastole Artery Vein 200 400 600 (time) HR80 systole diastole Artery Vein 200 400 600 (time)

3 Shot Duration TSE-Factor +TE Trigger Delay TR shot duration STIR STIR STIR MIP STIR IR IR delay 140~160ms DRIVE IR Artery Vein 200 50 150 (time) 0 100 Q-Flow Artery Vein 200 50 150 (time) 0 100 80 160 STIR TI Delay Trigger Delay STIR TI Delay Qflow with VCG Qflow with PPU IR IR delay 140~160ms Phase Contrast Balanced-TFE Time OF Flight TRANCE VCG/PPU Respiration VCG/PPU VCG/PPU Gate sweep TRANCE PCA CINE b-TRANCE velocity encoding : Venc 43 RF Gz Gy Gx Signal FID (bipolar gradient) 2 47 RF Gz Gy Gx Signal FID PC Velocity Venc Bipolar Gradient Velocity : Velocity.

4 Venc 180 2 Venc GT2 Venc G T GT2 /(2 Venc) Phase Contrast PC Velocity PC Velocity PC velocity PC velocity dyn/ang Velocity SNR Velocity Velocity Velocity=10cm/s Velocity=50cm/s Velocity=90cm/s Velocity PC Velocity MRA CINE PCA D_PCA_COR Philips Head and Neck Angio PCA 3D_PCA_COR PPU 1 retrospective Device PPU arrhythmia rejection ( ) no Conflict yes heart phases 1 heart phases 1 Contrast 1 Fast Imaging mode TFE Shot mode multishot default HR 60 HR 80 TFE factor = 6 TFE factor = 4 shot mode : default HR TFE factor HR 60 HR 80 HR TFE factor shot mode : default HR 60 HR 80 TFE factor shot mode : multishot HR 60 HR 80 TFE factor = 6 TFE factor = 6 phase phases shot mode : multishot HR 60 HR 80 6phases 6phases 4phases 6phases act.

5 Phase percentage = 4/6 100 = % shot mode : multishot multi shot default Default phase acquisition gyro CUP 2012 Beonze Award 3D cine PCA MRA Geometry Coil selection element CLEAR FOV (mm) RFOV (%) Fold-over suppression Slice oversampling Matrix scan reconstruction Scan % SENSE Overcontiguous slices Stacks slices slice thickness (mm) slice orientation fold-over direction fat shift direction Chunks Rest slabs SENSE NV 16ch HNACPC yes 300 50 no default 208 512 60 no yes 1 40 coronal RL F 1 0 Scan mode technique Contrast enhancement Acquisition mode Fast imaging mode shot mode TFE startup echoes turbo direction Echoes partial echo shifted echo TE Flip angle (deg) TR Half scan Water-fat shift (pixels) Shim Fat suppression SAR mode B1 mode PNS mode Gradient mode SofTone mode 3D FFE T1 Cartesian TFE default default Y 1 yes no shortest 10 shortest no user defined default no high default low default no Cardiac synchronization device R-R window (%) heart phases arrhythmia rejection Respiratory compensation Navigator respiratory comp Flow compensation Motion smoothing NSA Angio/Contrast enh.

6 Quantitative flow PC flow directions uniform velocity PC velocity Manual start Dynamic study Dyn/ang Motion Contrast retrospective PPU 10, 20 12 yes no no yes no 1 phase contrast no RL-AP-FH yes 100 no no Preparation phase Interactive F0 MIP / MPR Images Reconstruction mode Ringing filtering Postproc auto no MIP M immediate rectangular * Total scan duration Act. TR/TE ACQ matrix M x P ACQ voxel MPS (mm) REC voxel MPS (mm) Scan percentage (%) TFE shots TFE dur. shot / acq (ms) TFE shot interval. Act. WFS (pix) / BW (Hz) Whole body / level Information 4:22 / 208 x 60 / / / / 260 / / W/kg / normal Phase Contrast Balanced-TFE Time OF Flight TRANCE VCG/PPU Respiration VCG/PPU VCG/PPU Gate sweep TRANCE PCA CINE b-TRANCE T2/T1 FID FID FID + SE signal Spin Echo FID SNR FID + SE signal + Stimulated echoes Stimulated echoes Spin Echo FID 74 RF Gz Gy Gx Signal - FID FID FID SE SE STE Spoiling FID SE STE Gradient TR=2TE Sin(a) Rho 1+T1/T2+(1-T1/T2) Cos(a)

7 Signal = 1 2 Rho T2 T1 0 5 10 15 20 25 30 0 20 40 60 80 100 120 140 160 180 steady state signal flip angle Arterial blood Fat NiCl2 Olive oil a Flip angle Rho T1 T2 Thin slice 1mm MRCPA 3D inFlow MRA Free breath inflowMRA Cine MIP original Balanced bTRANCE Invert volume selective / TFE factor Back ground TI:1200 (Invert) 1 REST prepulse TI TI 600 TI 800 TI 1000 TI 1200 TI 1400 bTRANCE bTRANCE 40 low-high radial SPAIR Invert volume selective / SPAIR Start up echo:40 TFE factor:80 Fat Back ground TI:1200 (Invert) 1 REST Phase Contrast Balanced-TFE Time OF Flight TRANCE VCG/PPU Respiration VCG/PPU VCG/PPU Gate sweep TRANCE PCA CINE b-TRANCE


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