Cerebral hemorrhage. Serial study using diffusion-weighted MRI.
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概要
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The purpose of the present study was to evaluate the clinical usefulness of diffusion-weighted magnetic resonance imaging (DWI) in the diagnosis of cerebral hemorrhage. Twenty-six parenchymal hematomas between 2 hours and 150 days old in 26 patients were studied. DWI was performed by 1.5 Tesla magnetic resonance imaging (Magnetom Vision, Siemens, Germany) with an echo-planar imaging sequence. The ratios of the apparent diffusion coefficient (ADC) in the hematoma to that in the contralateral areas were calculated. Hyperacute (<6 hours old) hematomas were characterized by hyperintensity on DWI. Acute (>6 hours and <7 days old) hematomas revealed a heterogeneous intensity (mixed hypo- and hyperintensity) on DWI. Subacute and early chronic (>7 days and <30 days old) hematomas had hyperintensity. Late chronic (>30 days old) hematomas displayed peripheral hypointensity on DWI. This hypointensity proceeded to replace hyperin-tensity. The ratios of the ADC ranged widely between 0.70 and 1.31 within 24 hours after onset. The values declined to 0.45-0.77 at 4-5 weeks after onset, and then increased gradually to more than 1.0 at 3 months after onset. DWI hyperintensity in cerebral hemorrhage within 6 hours after onset is not distinguishable from that in ischemic lesions. Furthermore. the ratio of the ADC in cerebral hemorrhage was variable within 24 hours after ontet. CT should therefore be used to diagnose cerebral hemorrhage during the first 6 hours after ictus.
- 一般社団法人 日本脳卒中学会の論文
一般社団法人 日本脳卒中学会 | 論文
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