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FIG 3. Pixel-by-pixel plots of rR versus rCBV for two examples of anaplastic astrocytoma (GIII) (top) and glioblastoma multiforme (GIV) (bottom). rR values show a relatively normal distribution in the grade III tumors and a more skewed distribution in the grade IV tumors. No evidence of correlation exists between rCBV and rR.
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