Table 1.
Summary of imaging parameters for QISS and UnQISS.
Parameter | QISS | UnQISS |
---|---|---|
Sampling bandwidth | 658 Hz/pixel | 651 Hz/pixel |
Cardiac gating | ECG | None |
Shot TR | RR interval | 2400 ms |
Intra-view TR | 3.8 ms | 3.5 ms |
TI/QI | 350 ms/228 ms | 1800 ms/1200 ms |
Spatial resolution | 3 mm × 1mm × 1mm | 3 mm × 1mm × 1mm |
K-space trajectory | Cartesian | Radial using optimized azimuthal view angles |
Acceleration | GRAPPA 2, 5/8 partial Fourier | None |
Venous suppression | Sinc RF pulse, 100 mm thickness | FOCI RF pulse, 200 mm thickness |
In-plane suppression | Sinc RF pulse, 6 mm thickness | FOCI RF pulse, 6 mm thickness |
Fat suppression | Chemical shift selective RF pulse | Phase-based |
RF coils | Phased array coils | Body coil or phased array coils |
Scan time/station | 48 sec for RR of 1 sec (depends on heart rate) | 115 sec (independent of heart rate) |