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In normal control subjects,a venous signal was found at a depth ranging from 40 to 72 mm,which was considered to correspond to the deep middle cerebral vein and the basal vein of Rosenthal.Mean blood flow velocities ranged from 9 to 20cm/s.In both patients with superior sagittal sinus thrombosis,Doppler studies detected elevated mean blood flow velocities (146 and 33cm/s),which normalized after 16 weeks and 1 week,respectively. Venous transcranial Doppler ultrasonography provides a reliable, noninvasive,and rapid technique for intracranial venous examination.It was performed without difficulty in young healthy volunteers,and it can be applied as a monitoring tool in the evaluation of collateral venous flow in superior sagittal sinus thrombosis. |
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