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Abstract #4137

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

Chang-Sheng Mei1, Shenyan Zong2,3, 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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