Validity of Negative High-Resolution Diffusion-Weighted Imaging in Transient Acute Cerebrovascular Events
نویسندگان
چکیده
منابع مشابه
Validity of negative high-resolution diffusion-weighted imaging in transient acute cerebrovascular events.
BACKGROUND AND PURPOSE A significant amount of strokes are reported to be diffusion-weighted imaging (DWI) negative in acute imaging. We attempted to quantify the rate of false-negative high-resolution (hr) DWI and to identify a valid screening tool to guide follow-up MRI to diagnose infarction initially not visible on hrDWI. METHODS An a priori-defined post hoc analysis of a prospective 3T M...
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BACKGROUND AND PURPOSE Among patients presenting with a transient ischemic attack (TIA), some clinical features predispose to recurrent TIA, whereas others predispose to subsequent strokes. We assessed the implication of negative diffusion-weighted imaging on a baseline MRI in predicting subsequent TIA. METHODS We prospectively studied patients presenting in the emergency department within 12...
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BACKGROUND AND PURPOSE A hypoxic-ischemic origin of transient global amnesia (TGA) has been suggested on the basis of the observation of infarctlike diffusion-weighted imaging (DWI) abnormalities in some affected individuals. We tested this hypothesis by comparing vascular risk factors, magnetic resonance imaging (MRI) markers of cerebral small-vessel disease, and other evidence of a cerebrovas...
متن کاملAccelerated High Spatial Resolution Diffusion-Weighted Imaging
Acquisition of a series of anisotropically oversampled acquisitions (so-called anisotropic "snapshots") and reconstruction in the image space has recently been proposed to increase the spatial resolution in diffusion weighted imaging (DWI), providing a theoretical 8x acceleration at equal signal-to-noise ratio (SNR) compared to conventional dense k-space sampling. However, in most works, each D...
متن کاملRole of Perfusion-Weighted Imaging in a Diffusion-Weighted-Imaging-Negative Transient Ischemic Attack
BACKGROUND AND PURPOSE The absence of acute ischemic lesions in diffusion-weighted imaging (DWI) in transient ischemic attack (TIA) patients makes it difficult to diagnose the true vascular etiologies. Among patients with DWI-negative TIA, we investigated whether the presence of a perfusion-weighted imaging (PWI) abnormality implied a true vascular event by identifying new acute ischemic lesion...
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ژورنال
عنوان ژورنال: Stroke
سال: 2013
ISSN: 0039-2499,1524-4628
DOI: 10.1161/strokeaha.113.001594