Abstract
A proton magnetic resonance spectroscopy (MRS) technique was used to measure 13C enrichments of glutamate and glutamine in a 3.5 × 1.8 × 2 cm3 voxel placed in the dorsal anterior cingulate cortex of five healthy participants after oral administration of [U-13C]glucose. Strong pseudo singlets of glutamate and glutamine were induced to enhance the signal strength of glutamate and glutamine. This study demonstrated that 13C labeling of glutamate and glutamine can be measured with the high sensitivity and spatial resolution of 1H MRS using a proton-only MRS technique with standard commercial hardware. Furthermore, it is feasible to measure 13C labeling of glutamate and glutamine in limbic structures, which play major roles in behavioral and emotional responses and whose abnormalities are involved in many neuropsychiatric disorders.
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