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Abstract #3024

MEGA-PRIAM: Dual-volume excitation and parallel reconstruction for J-difference-edited MR spectroscopy

Georg Oeltzschner1,2, Nicolaas A.J. Puts1,2, Kimberly L. Chan1,2,3, Vincent O. Boer4, Peter B. Barker1,2, and Richard A.E. Edden1,2

1Russell H. Morgan Department of Radiology and Radiological Science, The Johns Hopkins University School of Medicine, Baltimore, MD, United States, 2F.M. Kirby Research Center for Functional Brain Imaging, Kennedy Krieger Institute, Baltimore, MD, United States, 3Department of Biomedical Engineering, The Johns Hopkins University School of Medicine, Baltimore, MD, United States, 4Hvidovre Hospital, Danish Research Center for Magnetic Resonance, Hvidovre, Denmark

A twofold acceleration of MEGA-edited spectroscopy, using Parallel Reconstruction In Accelerated Multivoxel (MEGA-PRIAM) to simultaneously acquire data in two separate locations, is demonstrated. PRIAM separates the signals from two dualband-excited voxels using spatial receiver-coil sensitivity profiles. Phantom experiments show that MEGA-PRIAM separates GABA- and glutathione-edited spectra with low crosstalk between the voxels. In-vivo experiments establish that dual-voxel MEGA-PRIAM increases signal-to-noise ratio (SNR) 40% compared to sequentially acquired single-voxel MEGA-PRESS measurements with the same total duration. GABA and glutathione estimates are consistent between dual-voxel MEGA-PRIAM and single-voxel MEGA-PRESS acquisitions.

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