Fig 2. Typical case (grade IV glioma) demonstrating post-Gd T1, uncorrected relative cerebral blood volume (rCBV) map with artificially low tumor blood volume, the K2 parameter map from our fitting algorithm showing areas of greatest correction, and the corrected rCBV map highlighting a focus of corrected very high blood volume. On the bottom are sample tumor and normal brain regions of interest based on the corrected rCBV map.