TABLE 1.
Scan Parameters for Dynamic Contrast-Enhanced 3D T1-Weighted Spoiled Gradient-Echo MRI Used to Confirm Nonenhancement of All Cysts in Study Group, by Phase
| Parameter | Unenhanced | Arterial | Venous or Corticomedullary | Delayed or Nephrographic |
|---|---|---|---|---|
| TR (ms) | 3.6 | 3.6 | 3.6 | 3.6 |
| TE (ms) | 1.3 | 1.3 | 1.3 | 1.3 |
| FOV | Variable | Variable | Variable | Variable |
| Flip angle (°) | 12 | 12 | 12 | 12 |
| Matrix (frequency) | 256–320 | 256–320 | 256–320 | 256–320 |
| Matrix (phase) | 128–192 | 128–192 | 128–192 | 128–192 |
| Frequency direction | Right to left | Right to left | Right to left | Right to left |
| Section thickness (mm) | 4 | 4 | 4 | 4 |
| Receiver bandwidth (Hz) | 31.25–41.67 | 31.25–41.67 | 31.25–41.67 | 31.25–41.67 |
| Sensitivity-encoding factor | 2 | 2 | 2 | 2 |
| Acquisition time (s) | 18–22 | 18–22 | 18–22 | 18–22 |
| Delay (s) | NA | 20–30 | 60–90 | 120–150 |
| Subtraction capability | NA | Yes | Yes | Yes |
Note—Hz = hertz, NA = not applicable.