Three-dimensional contrast-enhanced MR angiography of the extracranial carotid arteries: two techniques.

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.