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
1. 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: >>> 1. Do the six columns represent translationX, translationY, translationZ >>> and rotationX, rotationY, rotationZ? >>> >>> 2. 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 >>> >>> >> -- >> Douglas N. Greve, Ph.D. >> MGH-NMR Center >> gr...@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 >> >> _______________________________________________ >> Freesurfer mailing list >> Freesurfer@nmr.mgh.harvard.edu >> https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer >> >> >> > -- Douglas N. Greve, Ph.D. MGH-NMR Center gr...@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 _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer The information in this e-mail is intended only for the person to whom it is addressed. If you believe this e-mail was sent to you in error and the e-mail contains patient information, please contact the Partners Compliance HelpLine at http://www.partners.org/complianceline . If the e-mail was sent to you in error but does not contain patient information, please contact the sender and properly dispose of the e-mail.
