Either fmcpr.mcdat or fmc.mcdat
On 09/13/2012 02:07 PM, New Fei Ho wrote:
Hi Doug,
Can you point out the name of file that I should be looking at?
I assumed they were either the mcextreg and mcprextreg output files, but these only have 6 columns.
Thanks, New Fei
Hi New Fei, I did some digging and found the docs for the output (pasted below). Translations (displacement) are in mm, rotations are in degrees doug
- n : time point 2. roll : rotation about the I-S axis (degrees CCW) 3. pitch : rotation about the R-L axis (degrees CCW) 4. yaw : rotation about the A-P axis (degrees CCW) 5. dS : displacement in the Superior direction (mm) 6. dL : displacement in the Left direction (mm) 7. dP : displacement in the Posterior direction (mm) 8. rmsold : RMS difference between input frame and reference frame 9. rmsnew : RMS difference between output frame and reference frame 10. trans : translation (mm) = sqrt(dS^2 + dL^2 + dP^2)
On 09/13/2012 11:21 AM, New Fei Ho wrote:
Hi Doug,
To explicitly clarify, does this mean X: L-R Y: Anterior-Posterior Z: Inferior-Superior
And are the values of translation/rotation in millimetres?
Thanks, New Fei
If by XYZ you mean column, row, slice, then yes. The values are with respect to the middle time point (or whatever you used as the template), it is not the relative difference. doug
On 09/12/2012 05:37 PM, New Fei Ho wrote:
Hi,
I would like to compare the mean head motion between two groups.
Just to clarify the values found in the mcprextreg file:
- Do the six columns represent translationX, translationY,
translationZ and rotationX, rotationY, rotationZ?
- Are the values found in each time-point (i) absolute, i.e. the
absolute difference in displacement between this time-point and the middle time-point, or (ii) relative i.e. difference between consecutive time-points?
Thanks, Newfei _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
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-- Douglas N. Greve, Ph.D. MGH-NMR Center greve@nmr.mgh.harvard.edu Phone Number: 617-724-2358 Fax: 617-726-7422
Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting FileDrop: www.nmr.mgh.harvard.edu/facility/filedrop/index.html