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Kep map obtained at 3 minutes in a cerebellar pilocytic astrocytoma (left image). Green curve represents the time–signal intensity curve of a region of interest (red circle in left image); red curve represents measured arterial input function; blue line corresponds to the last image considered for calculation (3 minutes) (right image). At 3 minutes, the washout phase has not been reached and Kep value in this region of interest was 0.50 minutes−1.
