It is standard dti analysis, so it computes the log(y), then sets up a seven column matrix with 1 b*gx*gx b*gx*gy b*gx*gz b*gy*gy b*gy*gz b*gz*gz
The b, gx, gy, and gz change with each row according to the bval and bvec files doug On 05/08/2015 05:29 AM, Anders Eklund wrote: > Dear freesurfer experts, > > I looked at the help text for the dt_recon function, and wonder how > the GLM is setup for the DTI data, is there a paper that describes how > freesurfer does it? Specifically, I'm interested in how a dataset with > 3-4 different b-values is analyzed. Is there a dummy variable in the > GLM that models the different b-values, since the data from different > b-values have very different variance? > > http://freesurfer.net/fswiki/dt_recon > > Regards, > Anders > > > _______________________________________________ > Freesurfer mailing list > [email protected] > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer -- Douglas N. Greve, Ph.D. MGH-NMR Center [email protected] 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 [email protected] 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.
