Yes, this is confusing. We can apply a transform to the MNI305 coords to get approx Tal coords. If QDEC is showing you "Tal" coords, then this is what has happened. I don't know what other papers reported. If they used the command line stream (ie, no QDEC), then it is probably MNI305

On 8/22/2019 4:01 PM, Avi Gharehgazlou wrote:

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Hi,

Thank you so much for your reply

I reviewed the link you sent and now know how to convert MNI305 to MNI 152 coordinates based on example of Case 8.

However, I am still confused regarding my question number 1... When I use QDEC to do my own analyses of lGI QDEC gives me Tal x,y,z (Talairach) coordinates in mc-z.abs.th13.sig.cluster.summary file. Wouldn't this mean that the coordinates reported in other lGI papers is also in Talairach space? But you say these coordinates are in MNI305 (fsaverage) space...

Will you please clarify this for me?

Thanks so much,

Avi

On Tue, Aug 13, 2019 at 6:36 PM Greve, Douglas N.,Ph.D. <DGREVE@mgh.harvard.edumailto:DGREVE@mgh.harvard.edu> wrote: Those coordinates are in mni305 space. See this page, case 8 https://surfer.nmr.mgh.harvard.edu/fswiki/CoordinateSystems

On 8/13/19 1:56 PM, Avi Gharehgazlou wrote:

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Hi,

I am conducting a meta-analysis on papers that have looked at local gyrification index (lGI) in Autism Spectrum Disorder (ASD) relative to typically developing (TD) peers.

All lGI papers have used the FreeSurfer software and have reported x,y,z coordinates for their significant clusters (in which lGI in ASD is different from TD).

Please help me with the below 2 questions:

1. My understanding is that these coordinates reported in lGI papers

are "surface coordinates" (of fsaverage). Is this correct?

2. How can I convert these x,y,z surface coordinates to MNI space

coordinates?

I'd really appreciate your reply,

Thanks so much,

Avi

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