Chemical exchange between endogenous labile guanidinium (Guan) protons of creatine and free water and its thermal dependency were investigated with CEST imaging. The apparent offsets of Cr-CEST were linearly correlated to the experiment temperatures and was relatively insensitive to Cr concentration and pH variations at a range corresponding to physiological and pathological conditions, suggesting a potential utility of Cr-CEST for in vivo thermometry based on endogeneous creatine of the biological tissue.
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Cai et al. (2024) studied this question.
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