title: Evaluation of traumatic subarachnoid hemorrhage using susceptibility-weighted imaging.
abstract: OBJECTIVE
  SWI is an MR imaging technique that is very sensitive to hemorrhage. Our goal was to compare SWI and CT to determine if SWI can show traumatic SAH in different parts of the subarachnoid space.
  
  
  METHODS
  Twenty acute TBI patients identified by CT with SAH underwent MR imaging scans. Two neuroradiologists analyzed the CT and SWI data to decide whether there were SAHs in 8 anatomical parts of the subarachnoid space.
  
  
  RESULTS
  Fifty-five areas with SAH were identified by both CT and SWI. Ten areas were identified by CT only and 13 by SWI only. SAH was recognized on SWI by its very dark signal intensity surrounded by CSF signal intensity in the sulci or cisterns. Compared with the smooth-looking veins, SAH tended to have a rough boundary and inhomogeneous signal intensity. In many instances, blood in the sulcus left an area of signal intensity loss that had a "triangle" shape. SWI showed 5 more cases of intraventricular hemorrhage than did CT.
  
  
  CONCLUSIONS
  SAH can be recognized by SWI through its signal intensity and unique morphology. SWI can provide complementary information to CT in terms of small amounts of SAH and hemorrhage inside the ventricles.
authors.affiliation: School for Biomedical Engineering, McMaster University, Hamilton, Ontario, Canada.
authors.forename: Z
authors.initials: Z
authors.lastname: Wu
authors.forename: Shaowu
authors.initials: S
authors.lastname: Li
authors.forename: J
authors.initials: J
authors.lastname: Lei
authors.forename: D
authors.initials: D
authors.lastname: An
authors.forename: E M
authors.initials: EM
authors.lastname: Haacke
mesh_terms: D000208:Acute Disease; D000328:Adult; D000368:Aged; D002552:Cerebral Ventricles / Q000473:pathology; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D012680:Sensitivity and Specificity; D020206:Subarachnoid Hemorrhage, Traumatic / Q000000981:diagnostic imaging* / Q000473:pathology*; D013346:Subarachnoid Space / Q000000981:diagnostic imaging / Q000473:pathology; D014057:Tomography, X-Ray Computed; D055815:Young Adult