Objective: Early detection and treatment of cerebral hypoperfusion as a consequence of posthemorrhagic vasospasm in patients with subarachnoid hemorrhage is a major challenge. While CT angiography may show vasospastic vascular segments, perfusion imaging is necessary to estimate the hemodynamic effect,[for full text, please go to the a.m. URL] ; SeriesInformation ; 66. Jahrestagung der Deutschen Gesellschaft für Neurochirurgie (DGNC)