Division of Neuroradiology Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International Yes The Johns Hopkins University School of Medicine NITRC Multi-site Frequency Drift MR Spectroscopy This dataset consists of PRESS data acquired before and after running a heavy gradient duty fMRI sequence using standardized protocols for GE, Philips and Siemens scanners. 1) Pre-fMRI PRESS (TR/TE = 5000/35 ms; FA = 90°; 64 transients; no water suppression; voxel size = 2 × 2 × 2 cm3; second-order shim; scan duration = 5:20 min); 2) BOLD-weighted EPI based on the ADNI-3 protocol (Weiner et al., 2017) (TR/TE = 3000/30 ms; 197 dynamics; EPI factor/echo train length = 31/64, duration = 10 min); -3) Post-fMRI PRESS (same parameters as for pre-fMRI PRESS except 360 transients and duration = 30 min). This dataset is distributed freely under the Creative Commons Attribution-NonCommercial-ShareAlike license and consensus from co-authors. 2021-6-23 2.0 2021-4-26 1.0 Multi-site Frequency Drift MR Spectroscopy MR, Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International http://www.nitrc.org/projects/bigdrift/