Table 2.
MR imaging and MR cholangiography parameters and acquisition protocol
| MR sequence | T2 weighted 2D TSE | T1 weighted 2D GRE | T2 weighted 3D ISO “respiratory triggered” | T2 weighted 2D SS TSE | T1 weighted 3D GREa |
|---|---|---|---|---|---|
| Fat suppression | With/without | Without | With | With | With |
| Contrast agent | Pre-contrast images assessed | Pre-contrast images assessed | Pre-contrast images assessed | Pre-contrast images assessed | Pre- and post-contrast images assessed |
| TR/TE | 4000/176 | 140/2.2–4.4 | 2500/683 | 4500/754 | 5.7/2.8 |
| Flip angle (degrees) | 150 | 90 | 140 | 180 | 10 |
| Section thickness (mm) | 5 | 5 | 1 | 50 | 2.5 |
| Matrix | 192 × 256 | 192 × 256 | 384 × 341 | 384 × 341 | 192 × 256 |
| Bandwidth (Hz/pixel) | 260 | 260 | 150 | 150 | 250 |
| Field of view (cm) | 30–50 | 30–50 | 30–50 | 30–50 | 30–50 |
2D, two-dimensional; 3D, three-dimensional; GRE, gradient recalled echo; ISO, isotropic; SS TSE, single shot turbo spin echo; TE, echo time; TR, repetition time; TSE, turbo spin echo.
a
T1 weighted 3D spoiled gradient recalled echo images were acquired at approximately 25, 60 and 150 s after contrast administration during the arterial, portal venous and delayed phases, respectively, and during the delayed hepatobiliary phase at approximately 20 min (gadoxetic acid ) or 75 min (gadobenate dimeglumine).