Table 1 MRI parameters for dynamic and quantitative MRI.
From: Dynamic magnetic resonance imaging of muscle contraction in facioscapulohumeral muscular dystrophy
Dynamic scan | T2-mapping | Fat fraction mapping | |
|---|---|---|---|
Single slice PC | 2D multi-echo spin-echo (MESE) | Multi-echo gradient-echo (MEGE) | |
Voxel | 2.3 × 2.3 × 5 mm3 | 1.2 × 1.2 × 10.0 mm3 | 1.0 × 1.0 × 5.0 mm3 |
Flip angle | 10° | 90°/ 180° | 7° |
Field-of-view | 225 × 300 mm2 | 448 × 224 | 448 × 260 |
Bandwidth per pixel | 400 Hz/px | 250 Hz/px | 1050 Hz/px |
Repetition time (TR)/echo time (TE) | (TR/TE) = 10.6/7.21 ms | 8–17 echoes, TR: 4100.0 ms, 1st TE & ΔTE: 10.9 ms | 6 echoes, TR 35.0 ms, first TE/echo spacing 1.7/1.5 ms |
Acquisition time | 5 min | 5 min | 15 min |
Other | Velocity encoding: 25 cm/s Temporal resolution: 42 ms, 1 k-space line per segment, 94 temporal phases | Extended-phase-graph fitting method | Interleaved monopolar echoes, weakly asymmetric sampling, fatty riot fitting |
