Intera achieva 1.5 t

A dynamic upper abdominal MRI was performed on a 1.5 T MR system (Intera Achieva 1.5 T; Philips Medical Systems, Best, The Netherlands) using a four channel SENSE body coil. A 15 - mL bolus of contrast material (gadodiamid [Omniscan, GE Healthcare Ireland]) and 20 mL of saline were delivered at 2 mL/second into an antecubital vein using an infusion pump injector (Medrad, Spectris Solaris; Indianola, Pa) and 5 sequential axial three - dimensional image datasets were acquired at precontrast, postcontrast 30 (Phase 1), 60 (Phase 2), 100 (Phase 3), and 130 (Phase 4) seconds using a T1 High Resolution Interpolated Volume Examination (THRIVE) perfusion sequence. (TR 4 msec, TE 1.9 msec, flip angle 10°, slice thickness 4 mm, field of view 320 - 380 mm). After transferring the images to Philips Extended Workspace, regions of interest were located over anterior, posterior gastric fundus wall and spleen parenchyma to generate signal intensity - time curves. One measurement was performed from spleen parenchyma in each pre - and postoperative stages (Figure 1, 3).
A single measurement was performed from gastric fundus wall in preoperative stage (Figure 2), and two measurements were done from the anterior and posterior wall in postoperative stage (Figure 4). The signal intensities were calculated as arbitrary units (a).