Table 1 Imaging parameters for patient studies
From: Improved dark blood imaging of the heart using radial balanced steady-state free precession
Pulse sequence | Radial bSSFP | Cartesian fast spin-echo |
|---|---|---|
Spatial resolution | 6 mm × 1.4–1.9 mm × 1.4–1.9 mm | 8 mm × 1.4 mm × 1.4 mm |
Field-of-view | 225 mm–240 mm | 340 mm |
Parallel imaging | None | Ipat factor = 2 |
Sampling matrix | 128–160 | 256 |
Flip angle for readout | 60O | 90O/180O |
Echo time | 1.4 ms | T1-weighted: 29 ms |
T2-weighted STIR: 47 ms | ||
Echo train length/shot | 95 ms | T1-weighted: 70 ms |
T2-weighted STIR: 108 ms | ||
Echo spacing | 2.7 ms | T1-weighted: 5.8 ms |
T2-weighted STIR: 7.2 ms | ||
Sampling bandwidth | 1002 Hz/pixel | T1-weighted: 305 Hz/pixel |
T2-weighted STIR: 235 Hz/pixel | ||
Magnetization preparation | Dual-inversion for dark blood | Dual-inversion for dark blood |
T2prep (T2prep time = 60, 90 ms) for T2-weighting | T1-weighted: Chemical shift-selective RF for fat saturation; STIR: short-tau (TI = 170 ms) inversion | |
Chemical shift-selective RF for fat saturation | ||
# of RR per trigger | T1-weighted: 1 | T1-weighted: 1 |
T2-weighted: 2 | T2-weighted STIR: 2 | |
Scan time/slice | T1-weighted: 4 × RR | T1-weighted: 9 (8 shots + 1 dummy rep) × RR |
T2-weighted: 8 × RR | T2-weighted STIR: 14 (13 shots + 1 dummy rep) × RR |