Tim Coalson can explain how to dedrift MNI space (which as Mike says is no
longer true MNI space).

Peace,

Matt.

On 7/2/18, 10:10 AM, "[email protected] on behalf of
Harms, Michael" <[email protected] on behalf of
[email protected]> wrote:

>
>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: [email protected]
>On 7/2/18, 7:14 AM, "[email protected] on behalf of
>Claude Bajada" <[email protected] on behalf of
>[email protected]> 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
>
>
>
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