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FIG 2. Phase-contrast image and flow measurements of a normal volunteer. Selected region of interest (left), labeled F1, is illustrated on one of the flow images. Maximum flow velocity in the region of interest for the 14 time points is illustrated graphically (right). Maximum systolic (between trigger delays of 250 and 1021 ms) and diastolic (first 250 and last 100 ms) velocities are approximately 2 cm/s. Velocities are relatively uniform throughout the subarachnoid space.
