All that bleeds is not black: susceptibility weighted imaging of intracranial hemorrhage and the effect of T1 signal.
OBJECTIVE
To determine if intracranial hemorrhages (ICH) are always hypointense on Susceptibility weighted imaging (SWI) and to determine the effect of T1-signal intensity on the appearance of ICH in SWI series.


METHODS
SWI and T1-signal intensities of ICH were retrospectively studied in a series of patients. SWI signal intensities were statistically correlated with T1-signal intensities.


RESULTS
In a series of 57 MRI scans from 40 patients, ICH was hypointense in 19, mixed-intensity in 21, and hyperintense in 17. Hyperintensity of ICH on SWI was significantly associated with increased T1 signal (P<.001).


CONCLUSIONS
ICH can have a varied appearance on SWI.
Department of Radiology, Division of Neuroradiology, University of Minnesota, 420 Delaware St SE, Minneapolis, MN, 55455.
Michael B
MB
Salmela
Department of Radiology, Division of Neuroradiology, University of Minnesota, 420 Delaware St SE, Minneapolis, MN, 55455.
Shri H
SH
Krishna
Department of Radiology, Division of Neuroradiology, University of Minnesota, 420 Delaware St SE, Minneapolis, MN, 55455.
Douglas J
DJ
Martin
Department of Radiology, Division of Neuroradiology, University of Minnesota, 420 Delaware St SE, Minneapolis, MN, 55455.
Sara Khanipour
SK
Roshan
Department of Radiology, Division of Neuroradiology, University of Minnesota, 420 Delaware St SE, Minneapolis, MN, 55455.
Alexander M
AM
McKinney
Department of Radiology, Division of Neuroradiology, University of Minnesota, 420 Delaware St SE, Minneapolis, MN, 55455.
Huseyin G
HG
Tore
Department of Mathematics Statistics and Computer Science, University of Wisconsin-Stout, 712 South Broadway St, Menomonie, WI, 54751.
Brian
B
Knaeble
Department of Radiology, Division of Neuroradiology, University of Minnesota, 420 Delaware St SE, Minneapolis, MN, 55455.
Jeffrey B
JB
Rykken
Department of Radiology, Division of Neuroradiology, University of Minnesota, 420 Delaware St SE, Minneapolis, MN, 55455.
Zuzan
Z
Cayci
Department of Radiology, Division of Neuroradiology, University of Minnesota, 420 Delaware St SE, Minneapolis, MN, 55455. Electronic address: jagad002@umn.edu.
Bharathi D
BD
Jagadeesan
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001769:Blood / Q000000981:diagnostic imaging; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007223:Infant; D020300:Intracranial Hemorrhages / Q000000981:diagnostic imaging*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D055815:Young Adult
Intracranial hemorrhage; MRI; Subarachnoid hemorrhage; Susceptibility weighted imaging