25Mg spectroscopy and imaging were performed for the first time in vivo. T1 and T2* of 25Mg were evaluated in model solutions and T2* was additionally estimated in vivo for the human calf. 25Mg spectroscopy of an MgCl2 model solution exhibits a single resonance attributed to free 25Mg2+ ions, while in vivo spectroscopy of a human calf displays an additional resonance possibly attributable to bound 25Mg. Phantom and in vivo 25Mg imaging of the human calf were performed with a voxel size of 25×25×25 mm3.
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