I would still say no -- the differences could still be due to differences in acquisition parameters
On 10/03/2016 02:30 PM, Martin Juneja wrote: > Thanks Dr. Harms and Dr. Greve. > So can I do the cortical thickness comparison if we have healthy > controls data from the same scanner but acquired using different > protocol e.g. if we get access of age-matched healthy controls data > from another lab who used the same scanner? > > Thanks. > > On Fri, Sep 30, 2016 at 12:02 PM, Douglas N Greve > <gr...@nmr.mgh.harvard.edu <mailto:gr...@nmr.mgh.harvard.edu>> wrote: > > You can do the comparison, but the interpretation is difficult. If you > see a difference, how do you know it is not due to the scanner? > There's > not much you can do ... > > > On 09/29/2016 02:54 PM, Martin Juneja wrote: > > Hello FS experts, > > > > I have a data set of 20 subjects (patients) collected at location-1 > > with 3T Siemens scanner. Also, I have a set of age-matched 20 > subjects > > (controls) collected at location-2 with 3T Siemens scanner. > > > > I am interested in comparing cortical thickness between controls and > > patients using FreeSurfer but I am not sure if I can do that since I > > have both the data sets collected at two different locations. > > > > I would really appreciate any inputs on this. > > > > I tried to find some papers on scanner differences but all I could > > find was between 1.5 T vs 3T or 3T vs 7T. Is there any special > > covariates I need to define for this purpose (if so then at > which step > > during analysis?) or is it not possible at all? > > > > Thanks. > > > > > > _______________________________________________ > > Freesurfer mailing list > > Freesurfer@nmr.mgh.harvard.edu > <mailto:Freesurfer@nmr.mgh.harvard.edu> > > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer > <https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer> > > -- > Douglas N. Greve, Ph.D. > MGH-NMR Center > gr...@nmr.mgh.harvard.edu <mailto:gr...@nmr.mgh.harvard.edu> > Phone Number: 617-724-2358 <tel:617-724-2358> > Fax: 617-726-7422 <tel:617-726-7422> > > Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting > <http://surfer.nmr.mgh.harvard.edu/fswiki/BugReporting> > FileDrop: https://gate.nmr.mgh.harvard.edu/filedrop2 > <https://gate.nmr.mgh.harvard.edu/filedrop2> > www.nmr.mgh.harvard.edu/facility/filedrop/index.html > <http://www.nmr.mgh.harvard.edu/facility/filedrop/index.html> > Outgoing: > ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/ > <ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/> > > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu <mailto:Freesurfer@nmr.mgh.harvard.edu> > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer > <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 > <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. > > > > > _______________________________________________ > 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
