From: Quantifying the reduction of respiratory motion by mechanical ventilation with MRI for radiotherapy
Breathing control strategy | Â | DIBH | FB/RB | PBH |
---|---|---|---|---|
MRI strategy | Â | 3D MRI | 4D MRI | 3D cine-MRI |
Sequence type | Â | BTFE | TSE | BTFE |
Resolution | (mm3) | 2.0 × 2.0 × 2.0 | 1.3 × 1.6 × 4.0 | 1.6 × 1.6 × 1.6 |
Field of view | (mm3) | 450 × 400 × 240 | 400 × 306 × 49 | 450 × 400 × 240—280 |
Echo time | (ms) | 1.36 | 50 | 1.26 |
Repetition time | (ms) | 2.7 | 562 | 2.5 |
Flip angle | (deg) | 20 | 90 | 20 |
Slice orientation | Â | Coronal | Coronal | Coronal |
Dynamic time | (s) | 14 | 6.2 | 11.4–14.5 |
Water-fat shift | (pixels) | 0.266 | 0.658 | 0.389 |