Table 1.
Imaging parameters of the reference prospectively triggered steady-state free-precession cine imaging and real-time compressed sensing cine imaging.
| Parameters | Cineref | CSrt |
|---|---|---|
| Repetition time—ms | 3.16 | 2.70 |
| Echo time—ms | 1.23 | 1.14 |
| Flip angle—degrees | 57 | 60 |
| Field of view—mm2 | 375 × 280 | 360 × 270 |
| Matrix—pixels2 | 288 × 216 | 224 × 168 |
| Spatial resolution—mm2 | 1.3 × 1.3 | 1.6 × 1.6 |
| Temporal resolution—ms | 41.2 | 49 |
| Slice thickness/gap—mm | 8/2 | 8/2 |
| Bandwidth—Hz/pixel | 915 | 900 |
| ECG mode | Prospective triggering | Adaptative triggering |
| Number of measured cardiac phases per cycle | 20 a | 17.0 ± 3.2 |
| Number of reconstructed cardiac frames per cycle—n | 20 a | 20 b |
| Number of views per frame—n | 13.0 ± 4.8 c | 18 a |
| Cycles of iterative reconstruction—n | NA | 40 |
| Acceleration factor | 2 | 11 |
Data are expressed as mean ± standard deviation in the absence of any indication. a Constant value. b Interpolation was performed to provide a constant frame rate of 20 cardiac phases per cycle for post-processing. c The number of views per frame was set according to the shorter RR interval in order to acquire 20 cardiac phases. Prospective triggering allows data sampling during a fixed acquisition window after each R peak while adaptative triggering allow data sampling until the next R peak occurs. Abbreviations: Cineref, reference segmented cine; CSrt, real-time compressed sensing cine; ECG, electrocardiogram; n, data represented as numbers; NA, not applicable.