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Abstract #1129

Toward Distinguishing Radiation Effects from Tumor Regrowth in an Irradiated Glioma Model

Carlos J Perez-Torres 1 , John A Engelbach 1 , Jeremy Cates 2 , Dinesh K Thotala 2 , Robert E Drzymala 2 , Joseph JH Ackerman 1,3 , and Joel R Garbow 1

1 Department of Radiology, Washington University, Saint Louis, MO, United States, 2 Department of Radiation Oncology, Washington University, Saint Louis, MO, United States, 3 Department of Chemistry, Washington University, Saint Louis, MO, United States

A major unmet challenge in the treatment of brain tumors is non-invasively differentiating recurrent tumor from delayed radiation injury. Our work focused on the difference in cellularity between tumor and radiation injury via Diffusion Weighted Imaging (DWI) and Magnetization Transfer Contrast (MTC) MRI. Our results in preclinical rodent models suggest that DWI may help discriminate between tumor and radiation effects while MTC, though sensitive , is mostly incapable of differentiating between tumor and radiation effects.

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