Abstract #4498

Probing Tumor Oxygenation Response to Hypoxic Gas Breathing

Donghan Mo Yang¹, Tatsuya J Arai¹, James Campbell¹, and Ralph P Mason¹

¹Radiology, The University of Texas Southwestern Medical Center, Dallas, TX, United States

Tumor oxygenation response to hypoxic gas breathing is studied in rat 13762NF breast tumors using BOLD and TOLD MRI, with hyperoxic gas breathing as reference. Time course of R₂* and R₁-weighted signal is analyzed for 100%, 16%, and 14% O₂ breathing challenges, respectively. Evidence for decreased blood oxygen saturation (sO₂) and decreased tissue oxygen partial pressure (pO₂) is observed, revealing different patterns depending on the tumor size.

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