[High b value diffusion-weighted imaging of the brain: evaluation of usefulness].
We assessed the usefulness of higher b values during diffusion-weighted imaging. When the b value was changed in a stepwise manner from 1000 s/mm(2) to 2000, and then 3000, the signal intensities of the region showing a high signal on the images were reduced by 39% and 55%, respectively. When they were compared with the intensities on the normal sides, they were increased by 29% and 40%, respectively, suggesting improvement in the detectability of cerebral infarction. The values of the apparent diffusion coefficient were reduced 15% and 31%, respectively. When they were compared with the values on the normal sides, the values were almost equivalent regardless of the b value.
Goto
Toshiaki
T
Department of Radiology, Sunagawa City Medical Center.
Oka
Masahiro
M
Ooya
Shigeyuki
S
D000208:Acute Disease; D000368:Aged; D016477:Artifacts; D001921:Brain / Q000473:pathology*; D002544:Cerebral Infarction / Q000175:diagnosis* / Q000473:pathology; D005260:Female; D006801:Humans; D007089:Image Enhancement / Q000295:instrumentation / Q000379:methods*; D008279:Magnetic Resonance Imaging / Q000295:instrumentation / Q000379:methods*; D008297:Male; D012815:Signal Processing, Computer-Assisted