The Closing Angle of Ruptured and Unruptured Cerebral Aneurysm

Cerebral aneurysms rupture when their natural frequencies coincide with bruit frequencies. The natural frequencies of cerebral aneurysms are determined by their closing angles When the closing angles approaches 48.5° (+/- 1.3°), the untreated or partially treated cerebral aneurysms face higher risk of rupture. Using the Closing Angle to predict which aneurysm is at risk of rupture may help in therapeutical decisions.