第26回関西Gyro 2017.6.3 3D撮像の基礎

1 1 26 Gyro 3D TSE Yu UedaPhilips Electronics JapanMRApplication Specialist3D-TSE MRCP Heavy T2WI T2W Drive:TE200msecMRCP:TE 500msec motion artifact echo space Today Topics3 DTSE VISTA NewSequence-3 DView-Today Topics3 DTSE VISTA NewSequence-3 DView-MS3D6mm Thickness 2mm Thickness 2mm Thickness 2D vs. 3D6 RFZ Y X EchoEcho RFZ Y X Y Z Y X Z X 2 Dvs3 DXYRFZYXZ3 DXYRFZYXZ3 DXYRFZYXZ3 DXYRFZYXZ3D (p) (m) (s)acquisition time(TSE factor x Echo Space)TRshot interval1sl3 DTSERFZ Y X Echo TR 3000 20 NSA 3000 20 1 60000ms 60 1 k=0XY2D RFZ Y X Echo TR NSA Slice 3000 20 NSA Slice 100 3000 20 1 100 6000000ms 6000 100 YXZ3D 3D SNR XYZXYZ2D3D z3D volume 3D SNR 2D Today Topics3 DTSE VISTA NewSequence-3 DView-VISTA VISTA Volume Isotropic TseAcquisition 3D T2WI T1WI PDWI FLAIR STIR black blood BB 3D-TSE VISTA 3D nonselective ?

2 ?18090 RFGzGyGxSignal160150140 Echo space3D volume selectiveR12 / 3D-TSE18090 RFGzGyGxSignal160150140R12 / VISTA3D volume selectiveEcho space18090 RFGzGyGxSignal160150140R12 / VISTA3D volume selectiveEcho spaceEcho space TE 3D non-selective : no3D non-selective : yesVISTAVISTAT2 WIFLAIRT1 WITE Echo spaceTSE factor motion artifact TEeffTEeff TE 3D non-selective no3D non-selective yesEcho spaceTSE factor 25TE eff TEeffTEeff3D non-selective no3D non-selective yesVISTA TE 3D Non-selectiveUltra shortHalfScanProfile order Refocusing controlFlow CompensationSlice oversamplingStartup echo VISTA TE 3D Non-selectiveUltra shortHalfScanProfile order Refocusing controlFlow CompensationSlice oversamplingStartup echo Ultra short ES TE motion artifact Ultra shortUltra short : noUltra short.

3 YesVISTA TE 3D Non-selectiveUltra shortHalf ScanProfile order Refocusing controlFlow CompensationSlice oversamplingStartup echo Half scan data data TE k- k=0 Half scanHalf Scan + Rev. Lineark=0k=0 Half Scan + Linear TE TE TE Half scank=0 Full Scan + LinearTEeff: 128 5 = 640ms-128+127k=0 Half Scan + Linear-128+127half factor : : 26 5 = 130msEcho SpaceHalf scank=0 Full Scan + LinearTEeff: 128 5 = 640msk=0 Half Scan + Rev. Linearhalf factor : : 128 5 = 640ms : 256 5 = 1280ms : 154 5 = 770ms-128+127-128+127 VISTA TE 3D Non-selectiveUltra shortHalfScanProfile order Refocusing controlFlow CompensationSlice oversamplingStartup echo 3Dk-spaceprofileorderInner LoopContrastProfile orderLow-HighTurbo direction Half ScanNoYesLinear ContrastRev-LinearInner LoopContrastProfile orderLow-HighTurbo directionYHalf ScanNoYesLinearZContrastRev-Linear R1 R2 RadialYXZI nner LoopContrastProfile orderLow-HighTurbo directionYHalf ScannoInner-loopOuter loopContrast / AngOuter Loop AngioInnerLoop OuterLoop3 DTSE OuterLoop Linear Inner LoopContrastProfile orderLow-HighTurbo directionYHalf ScannoYZ3Dk-spaceprofileorder TE T1WI PDWI Inner LoopContrastProfile orderLinearTurbo directionYHalf ScannoYX3Dk-spaceprofileorder TE T2WI T1WI PDWI YXZI nner

4 LoopContrastProfile orderLinearTurbo directionZHalf data datak=0 HalfScan K0 TE mm isovoxel .. VISTA 3D-TSE TSE factor Turbo direction Y Scan percentage Inner LoopContrastProfile orderLow-HighTurbo directionRadialHalf ScanNoXYZ3Dk-spaceprofileorderk-space shutter 20% 3Dk-spaceprofileorderLow-HighAsymmetricL inearRev-LinearYT1wPDwT1wPDwT2wT2wT2wRad ialT1wPDwT2w Half scan TE Scan percentage turbo direction : radial Motion artifact Half scan turbo direction : Y3Dk-spaceprofileorderT1 WIlow-high +Y orradial asymmetric+ YT2 WIlinear + Y orradial asymmetric + YPDWI linear + Y orradial asymmetric + Ylow-high + Y orradialVISTA TE 3D Non-selectiveUltra shortHalfScanProfile order Refocusing controlFlow CompensationSlice oversamplingStartup echo Refocusing control R10 RF pulse+ Echo a 3D-TSE Refocusing control angle default 90 180 160 160 160 160 160 160 160 RF pulse+ Echo b VISTA Refocusing control angle 60 90 120 60 60 60 60 60 60 60 RF pulse+ Echo90 60 60 60 60 c VISTA Refocusing control angle 60 Refocusing control R10 RF pulse+ Echo a 3D-TSE Refocusing control angle default 90 180 160 160 160 160 160 160 160 RF pulse+ Echo b VISTA Refocusing control angle 60 90 120 60 60 60 60 60 60 60 RFA SAR TR T2

5 MT RFA TEequiv equivalent TE ( TEequiv) equivalent TE ( TEequiv) TEeffTEequiv k0 TEEffectiveTEvsEquivalentTE180 120 90 30 TEeff: 110msTEeff: 140msTEeff: 240msTEeff: 100msTEeff: 100msTEeff: 100msTEeff: 100ms120 90 30 2D-T2 WVISTA BB 3D TSERA403D TSE RA160 Refocusing angle VISTA TE 3D Non-selectiveUltra shortHalfScanProfile order Refocusing controlSlice oversamplingFlow CompensationStartup echo Slice encode54 RFZ Y X EchoEcho RFZ Y X Y Z Y X Z X 2D3D3D-TFE FFE Default 28%Slices Z)10040%40%OverlapOverlapSlices 80%Slices Z)100 ~SliceOverSamplingSliceOverSamplingSagit al slice oversampling Sense factor SliceOverSamplingphasebehaviour0-fMaxfMa x AB SliceOverSamplingdefaultSagittal Transverse 3D non-selective yes Echo space S/N 3D non-selective yes sensitized non-selective flow artifact FlowCompensation sensitizedGGttime 90 180 GyPhaseFlowCompensation sensitized 18090 RFGzGyGxSignal160150 FlowCompensation sensitizedVISTA TE 3D Non-selectiveUltra shortHalfScanProfile order Refocusing controlSlice oversamplingFlow CompensationStartup echo TSE factor blurringk 90 180 Echo T2 K BlurringTSE factor blurring90 180 TSE factor=9 TSE factor=390 180 shot durationshot durationTSE factor

6 Blurring90 180 TSE factor=9 TSE factor=390 180 shot durationshot durationTSE factor shot duration Startup echoTEeffTEeffTSE Factor 9 TSE Factor 9 Linear Start up echo2 Startupecho blurring Low-HighTSEF actor20 RFA30 Topics3 DTSE VISTA NewSequence-3 DView-VISTAvs3 DViewVariable Flip angle SweepVISTAA dvanced 3T 3D ViewVISTAS imple Advanced sweepConstant RFAsVISTAvs 3 DViewk0 Echo CSFGMWMk0 Echo CSFGMWMVISTAA dvanced 3T 3D View TE SNR BrainView R3 3 DViewMSKView RFA 3D View TI180 CSF9090T2 prepulse180 TIT2 PrepPulse T2 TR5000 BrainViewFLAIRB rainViewFLAIR TEequivMulti Slice FLAIR Thickness 5mmBrain ViewFLAIRTRA Thickness 4mmBrainViewFLAIR MSFLAIR antiDRIVE MSKViewToday Topics3 DTSE NewSequence-3 DView- SNR 3 DNon selective Refocusing control Variable FlipAngleSweep SNR blurring