title: Sizing rings: a simple technique for measuring intracranial lesions.
mesh_terms: D004867:Equipment Design; D006801:Humans; D002532:Intracranial Aneurysm / Q000000981:diagnostic imaging* / Q000601:surgery; D002538:Intracranial Arteriovenous Malformations / Q000000981:diagnostic imaging* / Q000601:surgery; D011859:Radiography; D016634:Radiosurgery / Q000295:instrumentation; D013238:Stereotaxic Techniques / Q000295:instrumentation*; D013679:Technology, Radiologic / Q000295:instrumentation