Xiao-Hong Zhu1, Fei Du1, Qiang Xiong1, Hongyan Qiao1, Xiao Liu1, Jianyi Zhang2, Xiaoliang Zhang3, Kamil Ugurbil1, Wei Chen1
1Center for Magnetic Resonance Research, Department of Radiology,, Minneapolis, MN, United States; 2Department of Medicine, University of Minnesota, Minneapolis, MN, United States; 3University of California San Francisco, San Francisco, CA, United States
In vivo 31P MRS in combine with saturation transfer provides a useful tool for noninvasively measuring the cerebral metabolic fluxes of creatine kinase (CK) and ATPase reactions. However, 3D imaging of these metabolic fluxes in human brain is challenging owing to limited sensitivity and complicated quantification model when a short (desired) repetition time is used. In this study, we demonstrate that with advanced 31P MRS imaging approach and a newly developed quantification method, it is possible to image the CK and ATPase reaction rate constants and fluxes in human brain at 7T. We found that these fluxes were several folds higher in the grey matter than white matter. This study demonstrates not only the superior sensitivity achievable at high/ultrahigh field, but also the great potential of 31P approach for studying cerebral HEP metabolism and neuroenergetics associated with brain function and dysfunction.