title: The need for a quantifiable normalized transcranial Doppler ratio for        the diagnosis of posterior circulation vasospasm.
authors.forename: J paul
authors.initials: Jp
authors.lastname: Muizelaar
mesh_terms: D001488:Basilar Artery / Q000000981:diagnostic imaging; D001921:Brain / Q000098:blood supply; D002560:Cerebrovascular Circulation; D006259:Craniocerebral Trauma / Q000000981:diagnostic imaging; D006801:Humans; D013345:Subarachnoid Hemorrhage / Q000000981:diagnostic imaging; D017585:Ultrasonography, Doppler, Transcranial / Q000379:methods*; D020301:Vasospasm, Intracranial / Q000097:blood / Q000175:diagnosis / Q000000981:diagnostic imaging*