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Fig. 4. —Normal duplex MR imaging of superior sagittal sinus in 34-year-old healthy female volunteer. Real-time duplex MR image (encoding velocity, 100 cm/sec) shows measurement of superior sagittal sinus (region of interest indicated by four white circles) during normal breathing. Note slow pulsatile flow with peak systolic velocity of 36.25 cm/sec. Craniocaudally directed flow is displayed above baseline.

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