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Fig. 1A. —28-year-old healthy male volunteer. Sagittal two-dimensional phase-contrast MR venogram (TR/TE, 25/7; velocity encoding, 40 cm/sec) of superior sagittal sinus guides placement of imaging planes near perpendicular to anterior (SS1) and mid (SS2) portions of superior sagittal sinuses. SS1 and SS2 lines correspond to points at which measurements were made but are not exact imaging planes.