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Fluid-attenuated inversion recovery (FLAIR) is a magnetic resonance imaging sequence with an inversion recovery set to null fluids. For example, it can be used in brain imaging to suppress cerebrospinal fluid (CSF) effects on the image, so as to bring out the periventricular hyperintense lesions, such as multiple sclerosis (MS) plaques. [ 1 ]
In diffusion weighted imaging (DWI), the intensity of each image element reflects the best estimate of the rate of water diffusion at that location.Because the mobility of water is driven by thermal agitation and highly dependent on its cellular environment, the hypothesis behind DWI is that findings may indicate (early) pathologic change.
Diffusion weighted (DWI) Conventional: DWI: Measure of Brownian motion of water molecules. [14] High signal within minutes of cerebral infarction (pictured). [15] Apparent diffusion coefficient: ADC: Reduced T2 weighting by taking multiple conventional DWI images with different DWI weighting, and the change corresponds to diffusion. [16]
The DWI enhancement appears within 5–10 minutes of the onset of stroke symptoms (as compared to computed tomography, which often does not detect changes of acute infarct for up to 4–6 hours) and remains for up to two weeks. Coupled with imaging of cerebral perfusion, researchers can highlight regions of "perfusion/diffusion mismatch" that ...
On the FLAIR, DWI and T2*-weighted images a small bleed is identifiable. DAI is difficult to detect since it does not show up well on CT scans or with other macroscopic imaging techniques, though it shows up microscopically. [9] However, there are characteristics typical of DAI that may or may not show up on a CT scan.
When both DWI and DUI are used by a particular state, the DWI may be a more serious charge. Then what is a DUI? With a DUI, the charge could mean that the driver was driving under the influence of ...
They didn't go that far. They balanced your constitutional rights, versus the states interest, in enforcing DWI's," says Fry. Redlich now has Fair DUI Flyers tailored to laws in over 12 states online.
A DWI, in vehicular crime, is a charge of driving whilst intoxicated (by alcohol) or impaired (by drugs). Dwi or DWI may also refer to: Dwi-, a prefix once used for undiscovered chemical elements; Diffusion-weighted imaging, in magnetic resonance imaging; Drinking Water Inspectorate, England and Wales