関西gyro meeting ~for next scan~ - 分解能を上げ...
TRANSCRIPT
![Page 1: 関西Gyro Meeting ~For Next Scan~ - 分解能を上げ …kansaigyro.web.fc2.com/lecture16/clinical2nakao.pdfScan% 100 SENSE 1.6 Slice厚(mm) 7 TR(ms) TE(ms) 97-261 Flip angle](https://reader034.vdocuments.net/reader034/viewer/2022042311/5eda0f49b3745412b570b07a/html5/thumbnails/1.jpg)
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分解能を上げて撮影したい!
Matrix scan
FOV
Scan percentageスキャン時間短縮に使用?
Reconstruction Matrix見かけの分解能向上のみ?
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従来からの設定方法でMatrix数を設定し、空間分解能が決定される。
Matrix変更→自動でACQ voxel MPS(mm)決定FOV変更 →自動でACQ voxel MPS(mm)決定
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Voxel sizeを設定することにより、空間分解能が決定される。
Voxel size変更→自動でMatrix決定FOV変更 →自動でMatrix決定
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Voxel sizeを設定することにより、空間分解能が決定される。
Voxel size変更→自動でMatrix決定FOV変更 →自動でMatrix決定
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☆Matrixの変更Matrix scanを128-512に段階的に変更し、ピンファントムとボランティア画像の比較
☆FOVの変更同一のACQ voxel MPSの面内分解能でFOVとMatrix scanを変更し、ボランティア画像で比較
☆Scan percentageの変更Scan percentageを100-30%に変更し、ピンファントムとボランティア画像で比較
☆Reconstructionの変更Reconstruction Matrixを128-512に段階的に変更し、ピンファントムとボランティア画像で比較
☆おまけ
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☆上腹部(肝胆膵etc)撮影に多用されているシークエンス
ssh-T2w(呼吸同期) ・ T1w-DUAL ・ T1w-WATS ・ eTHRIVE
☆骨盤腔撮影に多用されているシークエンス
TSE-T2w ・ TSE-T1w
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MR装置
Intera Achieva1.5T Nova R3.2
Achieva3.0T TX Quasar Dual R3.2
使用コイル
SENSE-Body Coil 4ch
SENSE-Torso/Cardiac Coil 32ch
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FOV(mm) 350
RFOV(%) 80
Matrix 128-512
Scan% 100
SENSE 1.6
Slice厚(mm) 7
TR(ms)
TE(ms) 97-261
Flip angle 90
NSA 1
WFS(pix)/BW(Hz) 0.362/601
1.Single-shot T2W
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1.Single-shot T2W
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1.Single-shot T2W
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1.Single-shot T2W
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1.Single-shot T2W
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FOV(mm) 350
RFOV(%) 80
Matrix 128-416
Scan% 100
SENSE 1.6
Slice厚(mm) 7
TR(ms) 200
TE(ms) 4.6
Flip angle 80
NSA 1
WFS(pix)/BW(Hz) 0.337/645.7
2.Dual echo in phase
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2.Dual echo in phase
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2.Dual echo in phase
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2.Dual echo in phase
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2.Dual echo in phase
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FOV(mm) 350
RFOV(%) 80
Matrix 128-448
Scan% 100
SENSE 1.6
Slice厚(mm) 7
TR(ms) 160
TE(ms) 5
Flip angle 70
NSA 1
WFS(pix)/BW(Hz) 0.400/542.5
3.WATS
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3.WATS
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3.WATS
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3.WATS
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3.WATS
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FOV(mm) 350
RFOV(%) 80
Matrix 128-416
Scan% 100
SENSE 1.5
Slice厚(mm) 4
TR(ms) 4.8
TE(ms) 2.4
Flip angle 10
NSA 1
WFS(pix)/BW(Hz) 0.451/4823
4.eTHRIVE
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4.eTHRIVE
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4.eTHRIVE
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4.eTHRIVE
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4.eTHRIVE
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FOV(mm) 250
RFOV(%) 100
Matrix 128-512
Scan% 100
SENSE 1.5
Slice厚(mm) 4
TR(ms) 5000
TE(ms) 90
Flip angle 90
NSA 2
WFS(pix)/BW(Hz) 1.855/117.1
5.T2W TSE
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5.T2W TSE
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5.T2W TSE
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5.T2W TSE
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5.T2W TSE
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FOV(mm) 250
RFOV(%) 100
Matrix 128-512
Scan% 100
SENSE 1.5
Slice厚(mm) 4
TR(ms) 500
TE(ms) 9
Flip angle 90
NSA 3
WFS(pix)/BW(Hz) 0.517/420.0
6.T1W TSE
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6.T1W TSE
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6.T1W TSE
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6.T1W TSE
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6.T1W TSE
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VS
VS
60.2% 40.8%
25.7% 4.8%
1.Single-shot T2W
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VS
VS
61.7% 71.6%
41.5% 48.2%
2.Dual echo in phase
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VS
VS
32.7% 43.1%
61.7% 71.4%3.WATS
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VS
VS
61.7% 71.7%
41.3% 48.2%
4.eTHRIVE
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VS
VS
62.2% 70.4%
34.4% 41.1%
5.T2W TSE
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VS
VS
62.3% 71.5%
49.5% 59.3%
6.T1W TSE
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1.Single-shot T2W
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1.Single-shot T2W
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1.Single-shot T2W
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1.Single-shot T2W
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2.Dual echo in phase
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2.Dual echo in phase
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2.Dual echo in phase
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2.Dual echo in phase
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3.WATS
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3.WATS
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3.WATS
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3.WATS
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5.T2W TSE
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5.T2W TSE
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6.T1W TSE
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6.T1W TSE
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1.Single-shot T2W
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1.Single-shot T2W
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1.Single-shot T2W
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1.Single-shot T2W
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2.Dual echo in phase
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2.Dual echo in phase
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2.Dual echo in phase
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2.Dual echo in phase
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3.WATS
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3.WATS
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3.WATS
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3.WATS
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4.eTHRIVE
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4.eTHRIVE
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4.eTHRIVE
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4.eTHRIVE
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5.T1W TSE
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5.T1W TSE
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7.T1W TSE
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7.T1W TSE
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7.T1W TSE
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7.T1W TSE
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7.T1W TSE
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7.T1W TSE
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7.T1W TSE
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7.T1W TSE
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7.T1W TSE
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Single-shot T2W 512×512 ACQ 0.68×0.68
Dual echo in phase 416×416 ACQ 0.84×0.84
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WATS 448×448 ACQ 0.78×0.78
eTHRIVE 416×416 ACQ 0.84×0.84
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☆Matrixの変更Matrix scanを128-512に変更すると、ピンファントムでは、 Matrix数が大
きい方がより高分解能の撮影が可能であった。しかし臨床画像では、撮影時間の延長やS/N低下により、診断価値のない画像となる危険性もあるように感じた。使用コイルの感度や撮影部位に応じた適切な分解能設定が必要である。
☆FOVの変更同じACQ voxelでは、FOVが広い方がInformationのSignal level(%)が10%
程度高値であった。FOVのみで分解能を高めるのは、S/Nの低下をまねくと思われる。しかし、Matrixのみで分解能を高く設定すると撮影時間の延長が顕著となり、FOVとMatrixのバランスを考慮した設定が必要である。
☆Scan percentageの変更ピンファントムとボランティアの検討では、70%程度までならほぼすべて
のシーケンスで分解能の顕著な低下が認められなかった。Scan%の変更は、高分解能を維持しつつ撮影時間やS/Nの向上に変更するパラメーターと感じた。
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☆Reconstructionの変更ACQ voxelの数倍のマトリックスで表示させると、ピンファントムで一見分解能が高くなったような印象を受けたが、ピンファントムの周囲にアンダーシュート状のアーチファクトが目立つようになった。しかし、ACQ voxel 0.40*0.40程度の高分解能撮影では、4倍のREC voxel
0.10*0.10で表示させてもアンダーシュート状のアーチファクトの出現が抑えられ分解能向上つながった。