In mri_glmfit, this is just the contrast value (gamma) divided by the residual stddev (rstd), and something similar for the selxavg3-sess. In mri_glmfit, the residual is the residual of the group model; in selxavg it is the residual from the timer series modeling, so they are very different
On 12/21/2017 12:17 PM, sha...@nmr.mgh.harvard.edu wrote: > Hi Surfers, > As you know, there are multiple ways to measure contrast to noise > ration (CNR). I am trying to understand how is cnr.nii generated as an > output from mri_glmfit command. > I also noticed that, cnr.nii values are mostly NaN when I have one > subject only. I am wondering why it is not the same as cnr.nii > generated by selxavg3-sess for the same subject. > > Regards > > > _____________________________________ > > Shahin Nasr > > PhD in Cognitive Neuroscience > Martinos Imaging Center, MGH > Harvard Medical School > Bldg 149, 13th street, > Charlestown, MA 02129 > > _______________________________________________ > 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: https://gate.nmr.mgh.harvard.edu/filedrop2 www.nmr.mgh.harvard.edu/facility/filedrop/index.html Outgoing: ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/ _______________________________________________ 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.
