Flow velocity of the common carotid artery was evaluated using the RACE technique before and during a Matas test. The total acquisition time is about 10 seconds without need for electrocardiographic synchronization. RACE is a one-dimensional projective flow measurement technique using fast low angle shot (FLASH) without phase encoding gradient (FLASH sequence: TR=20 ms, TE=6 ms, FA=90 degrees, FOV=220 mm, slice thickness=8 mm). Five normal subjects were studied with a 1.5 T superconducting imager (Siemens, Erlangen) using a neck coil.
The purpose of our study was to evaluate the flow velocity of the contralateral common carotid artery using Renal Time Acquisition and Velocity Evaluation (RACE) before and during a Matas test and to estimate brain collateral circulation. Prior to the temporary or permanent therapeutic occlusion of the carotid artery, evaluation of the cerebral collateral circulation via the circle of Willis is necessary in order to prevent complications. Isoda, Haruo Masui, Takayuki Takahashi, Motoichiro Mochizuki, Takao Kaneko, Masao Ohta, Atsuko Shirakawa, Toyomi. International Nuclear Information System (INIS) Matas test combined with MR flow measurement
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