RT Journal Article SR Electronic T1 Evaluation of Traumatic Subarachnoid Hemorrhage Using Susceptibility-Weighted Imaging JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology SP 1302 OP 1310 DO 10.3174/ajnr.A2022 VO 31 IS 7 A1 Z. Wu A1 S. Li A1 J. Lei A1 D. An A1 E.M. Haacke YR 2010 UL http://www.ajnr.org/content/31/7/1302.abstract AB BACKGROUND AND PURPOSE: 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. MATERIALS AND 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. BWbandwidthFAflip angleFLAIRfluid-attenuated inversion recoveryFPCfrontal-parietal convexityGRAPPAgeneralized autocalibrating partially parallel acquisitionHUHounsfield unitIHFinterhemispheric fissureIVHintraventricular hemorrhagekvpkilovoltage peakMIPminimum intensity projectionPFCposterior fossa cisternsPMCperimesencephalic cisternSAHsubarachnoid hemorrhageSVFSylvian fissureSWIsusceptibility-weighted imagingT1WIT1-weighted imagingT2WIT2-weighted imagingTBItraumatic brain injuryTNCtentorial cisternTOCtemporal-occipital convexityWMwhite matter