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DWI nearly doubles the likelihood of detecting acute ischemic stroke lesions compared with FLAIR for all etiologies and in all anatomic locations. In the hyperacute period (0 to 6 hours), DWI more than triples the likelihood of acute-stroke detection over FLAIR. PWI reveals a measurable mismatch compared with DWI nearly 50% of the time; and in more than half of these patients, the ratio of the volume of the PWI lesions to the DWI lesion in several times larger than the core ischemic lesion itself. In the final analysis, approximately one fourth of all stroke patients present with a large volume of potentially salvageable tissue at risk for infarction. |
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cerebrovascular accident
cerebrovascular accident,volume
ischemic penumbra
MRI
MRI,abnormal
MRI,diffusion weighted
MRI,FLAIR
MRI,mismatch between perfusion/diffusion
MRI,perfusion
neurologic disease,diagnoses of
review article
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