Note that the scanner gradient table does NOT account for the angulation of the subject in the magnet, nor does it account for the (relatively minor) impact of the imaging gradients on the effective diffusion sensitization — both of which are accounted for in the ‘bvecs’ file supplied with each subject. Thence my question about why you can’t use the provided ‘bvecs’ file...
The link to the gradient table that Jenn provided is tended more for individuals that want to duplicate the HCP acquisitions; not for analysis purposes. Also, note that the impact of the gradient nonlinearity is NOT accounted for in the provided ‘bvecs’, but can be handled using the ‘grad_dev.nii.gz’ file that we provide, in conjunction with the FSL modeling tools. cheers, -MH -- Michael Harms, Ph.D. ----------------------------------------------------------- Conte Center for the Neuroscience of Mental Disorders Washington University School of Medicine Department of Psychiatry, Box 8134 660 South Euclid Ave. Tel: 314-747-6173 St. Louis, MO 63110 Email: [email protected] From: <[email protected]<mailto:[email protected]>> on behalf of "Elam, Jennifer" <[email protected]<mailto:[email protected]>> Date: Monday, March 13, 2017 at 8:52 AM To: florian bernard <[email protected]<mailto:[email protected]>>, "[email protected]<mailto:[email protected]>" <[email protected]<mailto:[email protected]>> Subject: Re: [HCP-Users] need for gradient table MGH 5 subjects Hi Florian, Do you need the gradient table for the WU-Minn HCP diffusion (our project) or for the MGH diffusion? The table for WU-Minn is here: https://wiki.humanconnectome.org/display/PublicData/Gradient+Vector+Direction+table+for+HCP+dMRI Best, Jenn Jennifer Elam, Ph.D. Scientific Outreach, Human Connectome Project Washington University School of Medicine Department of Neuroscience, Box 8108 660 South Euclid Avenue St. Louis, MO 63110 314-362-9387<tel:314-362-9387> [email protected]<mailto:[email protected]> www.humanconnectome.org<http://www.humanconnectome.org/> ________________________________ From: [email protected]<mailto:[email protected]> <[email protected]<mailto:[email protected]>> on behalf of florian bernard <[email protected]<mailto:[email protected]>> Sent: Monday, March 13, 2017 6:24:53 AM To: [email protected]<mailto:[email protected]> Subject: [HCP-Users] need for gradient table MGH 5 subjects Sir, i'm trying to do create tracks with the WU Minn 5 subjects, but i need the gradient table. Is it possible for me to get it? Best regards Dr Bernard Florian, France _______________________________________________ HCP-Users mailing list [email protected]<mailto:[email protected]> http://lists.humanconnectome.org/mailman/listinfo/hcp-users _______________________________________________ HCP-Users mailing list [email protected]<mailto:[email protected]> http://lists.humanconnectome.org/mailman/listinfo/hcp-users ________________________________ The materials in this message are private and may contain Protected Healthcare Information or other information of a sensitive nature. If you are not the intended recipient, be advised that any unauthorized use, disclosure, copying or the taking of any action in reliance on the contents of this information is strictly prohibited. If you have received this email in error, please immediately notify the sender via telephone or return mail. _______________________________________________ HCP-Users mailing list [email protected] http://lists.humanconnectome.org/mailman/listinfo/hcp-users
