Dear list, we are currently working with some longitudinal data where we would like to measure volume changes over time and compare the cross-sectional and longitudinal stream on.
When we run the cross-sectional stream and just look at changes of eTIV within subjects over a period of 6 months to a year we get 3-4 subjects out of 110 that have eTIV changes of 20-30%. I've double checked the tailarach transforms using the talairach_afd tools and also manually checked the transforms with tkregister. Everything seems to be ok. I know when using the longitudinal stream we can use the single eTIV value for volume correction, but for comparison in case of the cross-sectional stream we want to use the single time point values of eTIV. Any ideas what else I can check or is this simply noise transferred from the linear estimation of eTIV? Cheers, Mel -- Melanie Ganz-Benjaminsen, MSc, Ph.D. Neurobiology Research Unit University of Copenhagen Rigshospitalet Rockefeller Center Juliane Maries Vej 28/30, 3. DK-2100 Copenhagen Denmark phone: +45 3545 6718 e-mail: melanie.g...@nru.dk web: http://melanie.clausundmelanie.de/ _______________________________________________ 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.
