Time‐of‐flight MR angiography

Time‐of‐flight effects depend on the displacement of blood with respect to a region of excitation. When combined with static material suppression and projection imaging, time‐of‐flight effects provide a flexible means of flow sensitization for magnetic resonance (MR) angiography. Bolus tracking, flow enhancement by spin replacement, and selective tagging are three classes of methods being pursued for MR angiography. © 1990 Academic Press, Inc.