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(a) Oblique scout image of descending aorta of normal volunteer. Line indicates position of prescribed pencil for subsequent Fourier flow sequence. (b) Results of Fourier velocity-encoded pulse sequence over 16 heart phases. Long lines correspond to static tissue, and short lines to flow in the aorta, with velocity proportional to vertical displacement relative to each long line. Velocity in the aorta rises to 70 cm/s and then falls again to zero.
