High Resolution EPR Imaging and T2-Based Oximetry Using a Combination of Spin-Echo and Single Point Imaging

Sankaran Subramanian¹, Nallathamby Devasahayam¹, Shingo Matsumoto¹, Cherukuri M. Krishna¹

Time-domain Electron Spin Resonance Imaging at RF frequency (300 MHz) has been developed for mapping oxygen distribution in mouse models of tumor. Oximetry is based on the relaxivity of in vivo pO2 on trityl radicals infused intravenously into the animals. A combination of spin echo and single point (constant-time) imaging (SPI) leads to highly resolved images with T2-weighting and generates quantitaive sptailly resolved oxygen ditribution maps.