MR angiography of an aberrant internal carotid artery.

Abstract

A 12-year-old girl had right-sided pulsatile tinnitus and a vascular­ appearing retrotympanic mass. MR was performed with a 1.5-T Signa scanner (GE Medical Systems, Milwaukee, WI) and a quadrature drive head coil. Standard sagittal and axial spin-echo T1-weighted, (600/27 /2 [TRfTE/number of excitations]) and dual-echo T2-weighted (2200/30, 90/1) pulse sequences were obtained by using a 20-cm field of view, slices 5 mm thick, and a 1-mm interslice gap. The standard pulse sequences were followed by an axial volume-spoiled gradient-recalled echo (SPGR) pulse sequence with TR = 45 msec, flip angle = 15°, and flow compensation. Sixty 1.5-mm partitions were obtained. The images were acquired in a 256 x 192 matrix and projected onto a 512 x 512 matrix by using a maximum image