MR Perfusion is a noninvasive way of determining blood flow to the brain in patients with strokes or brain tumors. Utilizing magnetic fields and intravenous contrast, blood flow is determined without the need for the use of x rays. Territory at risk for stroke can be compared to already infarcted tissue using diffusion weighted imaging, identifying the ischemic penumbra, or tissue not yet infarcted. In patients with brain tumors, radiation necrosis can mimic recurrent or residual tumor. MR perfusion can evaluate blood pool to try to distinguish these two entities. Tumors may be followed with perfusion as well to anticipate changes in growth.
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