High-Resolution 3 D-Constructive Interference in Steady-State MR Imaging and 3 D Time-of-Flight MR Angiography in Neurovascular Compression : A Comparison between 3 T and 1 . 5

RESULTS: SNR and CNR were significantly higher at 3T (P .001). Significantly better anatomic conspicuity, including delineation of CNs, nerve branches, and assessment of small vessels, was obtained at 3T (P .02). Severity of artifacts was significantly lower at 3T (P .001). Consequently, overall image quality was significantly higher at 3T. NVC was significantly better delineated at 3T (P .001). Six patients in whom NVC was not with certainty identifiable at 1.5T were correctly diagnosed at 3T.