Hi, Re (1): If you want to work with streamlines in MNI space then you have to accept the "drift" (volume expansion) that is part of MNI space itself.
Re (2): Maps may be resampled to surfaces in MNI space. But all the FreeSurfer structural quantities that we provide in the database/spreadsheet in ConnectomeDB are measured in the subject's real (native) space. Cheers, -MH -- Michael Harms, Ph.D. ----------------------------------------------------------- Associate Professor of Psychiatry Washington University School of Medicine Department of Psychiatry, Box 8134 660 South Euclid Ave. Tel: 314-747-6173 St. Louis, MO 63110 Email: mha...@wustl.edu On 7/2/18, 7:14 AM, "hcp-users-boun...@humanconnectome.org on behalf of Claude Bajada" <hcp-users-boun...@humanconnectome.org on behalf of c.baj...@fz-juelich.de> wrote: Dear experts, I have a few questions: 1) I am currently working on a project using tractography and the HCP data. I have used the HCP provided FNIRT based MNI registration in order to register individual streamlines from "native" or diffusion space (as per post HCP minimal processing pipeline) to MNI space. However, in Glasser 2016 supplementary text, it states that the MNI space is drifted relative to the mean brain size of individual brains (greatest along the x and z axes). I've been told that it is possible to "dedrift" these data and I wonder if anyone has experience in doing this and is able to point me in the right direction. 2) from what I understand, structural qualities such as cortical thickness etc are measured in the individual's real space. However then, what I do not understand is the file structure of the HCP data. The structural measures such as cortical thickness, curvature and myelin maps etc live in the MNINonLinear/fsaverage_LR32k rather than in the 'native space' directory. Can anyone shed light on this? Regards, Claude ------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------ Forschungszentrum Juelich GmbH 52425 Juelich Sitz der Gesellschaft: Juelich Eingetragen im Handelsregister des Amtsgerichts Dueren Nr. HR B 3498 Vorsitzender des Aufsichtsrats: MinDir Dr. Karl Eugen Huthmacher Geschaeftsfuehrung: Prof. Dr.-Ing. Wolfgang Marquardt (Vorsitzender), Karsten Beneke (stellv. Vorsitzender), Prof. Dr.-Ing. Harald Bolt, Prof. Dr. Sebastian M. Schmidt ------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------ _______________________________________________ HCP-Users mailing list HCP-Users@humanconnectome.org 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 HCP-Users@humanconnectome.org http://lists.humanconnectome.org/mailman/listinfo/hcp-users
