Abstract #4137

Temperature-induced chemical shift in single-shot echo-planar imaging

Chang-Sheng Mei¹, Shenyan Zong^2,3, Sheng Chen⁴, Guofeng Shen³, and Bruno Madore²

¹Department of Physics, Soochow University, Taipei, Taiwan, ²Department of Radiology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, United States, ³Biomedical Instrument Institute, School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, China, ⁴Shanghai Shende Medical Technology Co., Ltd, Shanghai, China

The proton resonance frequency (PRF) shift, whereby the Larmor frequency varies with temperature, is the effect that enables most currently-employed MR thermometry methods. The present work aimed to demonstrate that such temperature-related frequency changes can also cause non-negligible spatial distortions in single-shot EPI. In addition to demonstrating the effect, a solution is also proposed here. Phantom experiments are presented that demonstrate the problem and its solution.

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