Feasibility of a novel, rosette trajectory UTE (70 μs) 3D 31P MRSI sequence is tested at 3T in phantoms and in upper leg scan with healthy subject. Braino phantom, proton resolution phantom, and highly concentrated 31P phantom test demonstrated proper reconstruction and metabolite localization. In vivo calculations of acquired PCr and β-ATP signals showed competitive SNR across 20 voxels of interest. With further acceleration, the sequence may serve as a superior alternative to conventional weighted 3D MRSI, allowing for greater SNR or resolution in briefer times. Notably, this unprecedentedly short UTE 31P MRSI intrinsically avoids baseline and phasing issues.
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