Serial Study of Apparent Diffusion Coefficient and Anisotropy in Patients With Acute Stroke
نویسندگان
چکیده
منابع مشابه
Serial study of apparent diffusion coefficient and anisotropy in patients with acute stroke.
BACKGROUND AND PURPOSE We sought to characterize the evolution of apparent diffusion coefficient (ADC) and apparent diffusion anisotropy (ADA) in acute stroke and to evaluate their roles in predicting stroke evolution and outcome. METHODS We studied 26 stroke patients acutely (<24 hours), subacutely (3 to 5 days), and at outcome (3 months). Ratios of the ADC and ADA within a region of infarct...
متن کاملPredictors of apparent diffusion coefficient normalization in stroke patients.
BACKGROUND AND PURPOSE We sought to describe the frequency of normalization of apparent diffusion coefficient (ADC) values that are decreased in hyperacute stroke and to identify characteristics of tissue demonstrating normalization. METHODS Sixty-eight acute ischemic stroke patients underwent MRI examination (including diffusion/perfusion imaging and MR angiography) within 6 hours (mean, 2.8...
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Figure 2. (a) ADC (unit 1×10 mm/s) changes in the presence and absence of reperfusion; (b)histogram of tp2 ADC in the reperfused ROI that did (infarct) and did not (noninfarct) go on infarction. The two vertical lines show ADC abnormal threshold (left) and normal mean (right). Figure 1. Representative ADC, MTT at tp1 and tp2 and FLAIR at tp3 from two patients. The range of the colorbar is from ...
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Diffusion tensor imaging (DTI) studies of human ischemic stroke within 24 h of symptom onset have reported variable findings of changes in diffusion anisotropy. Serial DTI within 24 h may clarify these heterogeneous results. We characterized longitudinal changes of diffusion anisotropy by analyzing discrete ischemic white matter (WM) and gray matter (GM) regions during the hyperacute (2.5-7 h) ...
متن کاملEvolution of apparent diffusion coefficient, diffusion-weighted, and T2-weighted signal intensity of acute stroke.
BACKGROUND AND PURPOSE Serial study of such MR parameters as diffusion-weighted imaging (DWI), apparent diffusion coefficient (ADC), ADC with fluid-attenuated inversion recovery (ADC(FLAIR)), and T2-weighted imaging may provide information on the pathophysiological mechanisms of acute ischemic stroke. Our goals were to establish the natural evolution of MR signal intensity characteristics of ac...
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ژورنال
عنوان ژورنال: Stroke
سال: 1999
ISSN: 0039-2499,1524-4628
DOI: 10.1161/01.str.30.11.2382