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• W2099594057 abstract "The potential usefulness of gadopentetate dimeglumine (Gd-DTPA)-based dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) for assessing hypoxia in tumors with significant necrosis was investigated. Small (100-350 mm(3)) and large (500-1000 mm(3)) D-12 and U-25 tumors were subjected to DCE-MRI, measurement of the fraction of necrotic tissue, and measurement of the fraction of radiobiologically hypoxic cells. Images of E.F (E is the initial extraction fraction of Gd-DTPA and F is perfusion) and lambda (lambda is proportional to extracellular volume fraction) were produced by subjecting the DCE-MRI data to Kety analysis. Necrotic tissue could be identified in lambda images but not in E.F images of the tumors. Most voxels in viable tissue showed lambda values of 0.15-0.70, whereas the lambda values of most voxels in necrotic tissue were either <0.15 or >0.70. The E.F and lambda frequency distributions of the viable tissue, but not the E.F and lambda frequency distributions of the whole tissue, were consistent with the observation that the four groups of tumors showed similar fractions of radiobiologically hypoxic cells. E.F and lambda images may thus provide useful information on the extent of hypoxia in tumors provided that voxels in necrotic tumor regions are identified and excluded from the images." @default.
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• W2099594057 date "2008-06-01" @default.
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• W2099594057 title "Assessment of Fraction of Hypoxic Cells in Human Tumor Xenografts with Necrotic Regions by Dynamic Contrast-Enhanced MRI" @default.
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• W2099594057 doi "https://doi.org/10.1667/rr1311.1" @default.
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