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Physiologic Variations in Dural Venous Sinus Flow on Phase-Contrast MR Imaging

Neerav R. Mehta1,2, Lisa Jones1, Michael A. Kraut1 and Elias R. Melhem1

1 Department of Radiology and Radiological Sciences, Johns Hopkins Hospital, 600 N. Wolfe St., Baltimore, MD 21287.
2 Present address: Boston University School of Medicine, 88 E. Newton St., Boston, MA 02118.



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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.

 


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  		Fig. 1B. —28-year-old healthy male volunteer. Magnitude (left) and velocity (right) phase-contrast MR images (9/4.6; velocity encoding, 40 cm/sec) show anterior portion of superior sagittal sinus (1) in cross-section. Region of interest is drawn to encompass entire vascular lumen on magnitude image and is then copied to phase image.

 


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  		Fig. 1C. —28-year-old healthy male volunteer. Magnitude (left) and velocity (right) phase-contrast MR images (9/4.6; velocity encoding, 40 cm/sec) reveal both transverse sinuses (2) in cross-section. Region of interest is drawn to encompass entire right transverse sinus on magnitude image and is then copied to phase image.

 


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  		Fig. 2. —Graph shows normalized blood velocity in all examined dural sinuses averaged over 15 volunteers. Note variability in velocity during cardiac cycle. Maximum velocity begins during systole and drops to nadir by end diastole. {diamondsuit} = anterior portion of superior sagittal sinus, {blacksquare} = left transverse sinus, {blacktriangleup} = right transverse sinus, * = mid portion of superior sagittal sinus.

 

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