The appearance of rapidly flowing blood on imaging (MRI) was evaluated using flow phantoms and dye infusion experiments. Laminar flow can be maintained at high velocities in small-diameter vessels. Under such condftions, flow-related enhancement may be observed several slices into a multislice imaging volume. Decreasing crosssectional area of the unsaturated protons in the midstream is noted on slices further removed from the entry surface.
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