Abstract
Purpose : To evaluate the usefulness of dynamic gadolinium-enhanced MR imaging in the staging of bladder cancer. Material and Methods : Twenty-four patients with histologically proven bladder cancer underwent MR imaging before tumor resection. Pre contrast axial or sagittal T1- and T2-weighted images were obtained in all patients. In 12, dynamic MR imaging was performed using the 3D-EFGRE technique in the axial plane. Images were obtained 30, 90, and 180 sec after a rapid hand injection of Gd-DTPA. T1W1, T2W1, and Gd-enhanced dynamic images were compared on the basis of lesion conspicuity and correlated with histologic specimens. The signal intensity ratio (SIR) of bladder tumors, muscle, and perivesical fat during each phase, and the contrast- to-noise ratio (CNR) of lesion-to-muscle and lesion-to-fat were determined. Results : The accuracy of tumor staging using both T1WI and T2WI was 38% (9/24), and the accuracy of dy-namic gadolinium enhanced MR imaging was 58% (7/12). The difference was statistically significant (p
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