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