An update to the HCP Q3 Reference Manual:
The link to the toolbox used to obtain uniformly distributed diffusion directions in multiple q-space shells for HCP dMRI has changed to: http://www.emmanuelcaruyer.com/q-space-sampling.php For context, here is the summary of the Diffusion session from p.30 of the Reference Manual with the new link: A full HCP dMRI session includes 6 runs (each approximately 9 minutes and 50 seconds), representing 3 different gradient tables, with each table acquired once with right-to-left and left-to-right phase encoding polarities, respectively. Each gradient table includes approximately 90 diffusion weighting directions plus 6 b=0 acquisitions interspersed throughout each run. Diffusion weighting consisted of 3 shells of b=1000, 2000, and 3000 s/mm2 interspersed with an approximately equal number of acquisitions on each shell within each run. The diffusion directions were obtained using a toolbox that returns uniformly distributed directions in multiple q-space shells. The directions are optimized so that every subset of the first M directions is also isotropic. References and the diffusion directions toolbox can be found at: http://www.emmanuelcaruyer.com/q-space-sampling.php Best, Jenn Jennifer Elam, Ph.D. Outreach Coordinator, Human Connectome Project Washington University School of Medicine Department of Anatomy and Neurobiology, Box 8108 660 South Euclid Avenue St. Louis, MO 63110 <tel:314-362-9387> 314-362-9387 <mailto:[email protected]> [email protected] <http://www.humanconnectome.org> www.humanconnectome.org _______________________________________________ HCP-Users mailing list [email protected] http://lists.humanconnectome.org/mailman/listinfo/hcp-users
