Phase-contrast imaging of the parotid region.

Standard T1- and T2-weighted spin-echo acquisitions were compared with T1- and T2-weighted phase-contrast techniques in a series of 10 consecutive patients with parotid masses to assess the role of phase-contrast methods in the evaluation of lesions in the parotid fossa. Greater tissue-lesion contrast was obtained with phase-contrast methods in nine of 10 cases, allowing improved lesion visualization; however, an increase in lesion detectability was not observed in this series. Standard MR imaging methods are sufficient for imaging the parotid region in most cases, but can be quite time-consuming. Recommended screening of the parotid fossa that optimizes tissue-lesion contrast, lesion detectability, and imaging time is performed by combining a standard T1-weighted acquisition with a T1- or T2-weighted phase-contrast acquisition. Selection of a T1- or T2-weighted phase-contrast acquisition is determined by the T1 characteristics of the lesion.