PT - JOURNAL ARTICLE AU - Levy, R A AU - Maki, J H TI - Three-dimensional contrast-enhanced MR angiography of the extracranial carotid arteries: two techniques. DP - 1998 Apr 01 TA - American Journal of Neuroradiology PG - 688--690 VI - 19 IP - 4 4099 - http://www.ajnr.org/content/19/4/688.short 4100 - http://www.ajnr.org/content/19/4/688.full SO - Am. J. Neuroradiol.1998 Apr 01; 19 AB - Two methods of contrast-enhanced dynamic 3-D MR angiography of the head and neck are demonstrated. In the first, arterial and arteriovenous phases are temporally resolved by timing contrast injection such that maximum arteriovenous signal intensity difference is matched to acquisition of central k-space. A second, faster sequence allows for temporal resolution of arterial, early arteriovenous, late arteriovenous, and washout arteriovenous phases without a need for precise injection timing.