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001008222 245__ $$aQuantification of the neurochemical profile of the human putamen using STEAM MRS in a cohort of elderly subjects at 3 T and 7 T: Ruminations on the correction strategy for the tissue voxel composition
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001008222 520__ $$aThe aim of this work is to quantify the metabolic profile of the human putamen in vivo in a cohort of elderly subjects using single-voxel proton magnetic resonance spectroscopy. To obtain metabolite concentrations specific to the putamen, we investigated a correction method previously proposed to account for the tissue composition of the volume of interest. We compared the method with the conventional approach, which a priori assumes equal metabolite concentrations in GM and WM. Finally, we compared the concentrations acquired at 3 Tesla (T) and 7 T MRI scanners. Spectra were acquired from 15 subjects (age: 67.7 ± 8.3 years) at 3 T and 7 T, using an ultra-short echo time, stimulated echo acquisition mode sequence. To robustly estimate the WM-to-GM metabolite concentration ratio, five additional subjects were measured for whom the MRS voxel was deliberately shifted from the putamen in order to increase the covered amount of surrounding WM. The concentration and WM-to-GM concentration ratio for 16 metabolites were reliably estimated. These ratios ranged from ~0.3 for γ-aminobutyric acid to ~4 for N-acetylaspartylglutamate. The investigated correction method led to significant changes in concentrations compared to the conventional method, provided that the ratio significantly differed from unity. Finally, we demonstrated that differences in tissue voxel composition cannot fully account for the observed concentration difference between field strengths. We provide not only a fully comprehensive quantification of the neurochemical profile of the putamen in elderly subjects, but also a quantification of the WM-to-GM concentration ratio. This knowledge may serve as a basis for future studies with varying tissue voxel composition, either due to tissue atrophy, inconsistent voxel positioning or simply when pooling data from different voxel locations.
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001008222 7001_ $$0P:(DE-Juel1)138244$$aFarrher, Ezequiel$$b1$$eCorresponding author
001008222 7001_ $$0P:(DE-Juel1)161350$$aDoppler, Christopher E. J.$$b2
001008222 7001_ $$0P:(DE-Juel1)184882$$aSeger, Aline$$b3
001008222 7001_ $$0P:(DE-Juel1)179044$$aSommerauer, Michael$$b4
001008222 7001_ $$0P:(DE-Juel1)131794$$aShah, N. Jon$$b5
001008222 773__ $$0PERI:(DE-600)2267670-3$$a10.1371/journal.pone.0286633$$gVol. 18, no. 6, p. e0286633 -$$n6$$pe0286633 -$$tPLOS ONE$$v18$$x1932-6203$$y2023
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