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[Ultrasonic Doppler effects on the blood flow in intracranial aneurysms].

The authors studied the hemodynamics in small aneurysms from the viewpoint of the Doppler effect with continuous waves, using an in vitro test model and in vivo experiments during brain surgery. A significant difference in pattern was confirmed between the hemodynamics in small aneurysms and the normal intra-arterial hemodynamics. The results of these studies were clinically applied in two patients, one with a giant aneurysm and one with a large aneurysm, using a transcranial pulsed-wave Doppler unit. The intra-aneurysmal and the parent artery signals were monitored through the skull. Comparison of these sonagrams revealed a significant difference. The difference in sonagraphic patterns between the intra-aneurysmal blood flow and the intra-arterial flow is discussed, and the possibility that this method would provide a completely noninvasive screening test for intracranial aneurysms is mentioned.