title: Evaluation of cerebral aneurysms with helical CT: correlation with conventional angiography and MR angiography.
abstract: OBJECTIVE
  To evaluate detection of intracranial aneurysms with helical computed tomography (CT) and compare the results with those of conventional angiography and magnetic resonance (MR) angiography.
  
  
  METHODS
  Twenty-one patients with 30 intracranial aneurysms were studied with helical CT and conventional angiography; 17 of the patients (24 aneurysms) also underwent MR angiography.
  
  
  RESULTS
  All aneurysms 3 mm or larger in greatest dimension were seen with helical CT and MR angiography; no aneurysms smaller than 3 mm were apparent with either modality. Of the 21 aneurysms demonstrated with both helical CT and MR angiography, 11 were seen equally well with both techniques; six were seen better with helical CT owing to flow-related or motion artifact at MR angiography, and four were seen better with MR angiography because calcium partially obscured them at helical CT.
  
  
  CONCLUSIONS
  Helical CT is a promising noninvasive method of imaging the intracranial vasculature and is comparable with standard MR angiographic techniques in demonstrating aneurysms.
authors.affiliation: Department of Radiology, Brigham and Women's Hospital, Boston, MA 02115.
authors.forename: R B
authors.initials: RB
authors.lastname: Schwartz
authors.forename: H M
authors.initials: HM
authors.lastname: Tice
authors.forename: S M
authors.initials: SM
authors.lastname: Hooten
authors.forename: L
authors.initials: L
authors.lastname: Hsu
authors.forename: P E
authors.initials: PE
authors.lastname: Stieg
mesh_terms: D002533:Cerebral Angiography; D002536:Cerebral Arteries / Q000473:pathology; D006801:Humans; D002532:Intracranial Aneurysm / Q000175:diagnosis* / Q000000981:diagnostic imaging; D008279:Magnetic Resonance Imaging; D014057:Tomography, X-Ray Computed