Abstract
Magnetic Resonance Angiography provides an effective method to evaluate vascular morphology that involves very little risk to the patient. The quality of vascular delineation rests on a suitable choice of imaging parameters. This requires a detailed understanding of both the physics of MRI, and the physiology of blood flow in vivo. Three primary strategies are used: Time-of-Flight MR angiography creates differences in magnetization magnitude between flowing and stationary spins by manipulation of imaging parameters alone; Phase-contrast MR angiography induces changes in the spatial orientation, or phase, of flowing spins relative to stationary spins; and Contrast-Enhanced MR angiography creates differences in magnetization magnitude between flowing and stationary spins by injection of a contrast agent.
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