Hi Laura, it depends on how the data was acquired. These days we find that 3T multi-channel data you are probably better off avoiding the blurring associated with motion correction and averaging, and thta 1 volume is better. On the other hand if it's 1.5T single channel data at 1mm it may be too noisy with just a single acquisition. cheers Bruce On Fri, 28 May 2010, [email protected] wrote:
> Hi everyone, > > maybe this is a trivial question but I didn't find an answer in the archives, > so I'll post it anyway. > I've noticed in articles on cortical thickness using freesurfer that the > number of initial T1 volumes (orig) is quite variable, ranging from 1 to 3 or > 4. > We are planning to evaluate the cortical thickness for a large sample (30/40 > subjects), and we have 1 volume for each subject (3T, 200 slices. 1mm). I was > wondering whether using a single volume could affect the results. However, > I've already processed 15 subjects and the results look nearly perfect to me. > > Best regards > > Laura > _______________________________________________ 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.
