Did you also download the structural packages for those subjects?

Peace,

Matt.

From: 
<[email protected]<mailto:[email protected]>>
 on behalf of Gregory Butron 
<[email protected]<mailto:[email protected]>>
Date: Monday, January 11, 2016 at 1:54 PM
To: "[email protected]<mailto:[email protected]>" 
<[email protected]<mailto:[email protected]>>
Subject: [HCP-Users] Missing T1w_acpc_dc_restore files

Hi All.

I'm working with MEG data and I want to coregister it to the 
T1w_acpc_dc_restore.nii.gz processed structure scan as recommended by the 
reference manual.

I downloaded the MEG data for the subjects who had resting state MEG data, but 
I discovered that 16 of them do not have a T1w_acpc_dc_restore.nii.gz file.

Is there a reason why these subjects don't have this structure file? One of the 
subjects (725751) don't have any MRI data at all, so I suppose that is an 
excellent reason for not having the structure file, but I am a little confused 
by the others.

Since almost a quarter of the subjects with MEG data don't have the 
T1w_acpc_dc_restore.nii.gz file, I would like to use an alternative. Every 
subject that has a MRI scan has a T1.mgz file, so I think I can use this file 
instead, but I have a few questions that I have not found answers to in the 
documentation.

First, what coordinate system does the T1.mgz file (i.e. 
s3://hcp-openaccess/HCP/subjectID/T1w/subjectID/mri/T1.mgz) use? I think I 
would relate it to the MEG data using the vox07mm transforms that come with the 
MEG data, but I haven't found confirmation of that in the documentation.

Second, what sort of preprocessing has been done to the T1.mgz file? Have the 
axes been realigned? Has it been mapped to fit any standard models?

Thank you for your time,
Gregory Butron

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