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diffusion weighted imaging


Definition: MRIs with intensity proportional to the diffusion constant of water; because of the impaired movement of water in myelin, the signal is strongest parallel to nerve tracts; used primarily to evaluate edema in acute stroke, but also shows demyelinating diseases, and has been used in mapping muscle fiber direction in the heart.

Synonym(s): diffusion imaging

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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.