Hi Tamara have you visualized the multiple time points of a subject whose ventricular volume is decreasing? How big a decrease are you seeing?
cheers Bruce On Tue, 5 Sep 2017, Tamara Tavares wrote: > Hello, > I used the default longitudinal stream to calculate ventricular volumes over > time. When I examined > the difference score (longitudinal-baseline) I noticed that for some > participants ventricular > volumes decreased. The same site, scanner and scanning protocol was used for > both baseline and > longitudinal scans. I processed the cross, template and longitudinal time > points on the same > computer using the same Freesurfer version (v 5.1). Furthermore, this > decrease in ventricular volume > is evident before and after manual corrects were made to the aseg file. Is it > common to see an > decrease in ventricular volume over time? Can this be due to Freesurfer > variability or slight > differences in the scanner over the two time points? > > Thank you in advance for your help. > > Best, > Tamara > > _______________________________________________ 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.
