Hi Marie, But division by 5 would give the average area of the 5 mid slices. Maybe that is even more meaningful (reliable) than just a single slice.
Best, Martin On 04/14/2013 09:05 AM, Bruce Fischl wrote: > Hi Marie, > > no, that won't account for variability across slices in the l/r > direction. Try rerunning mri_cc with -t 0 (thickness) and see if it > generates a cc in just the midsagittal plane > > cheers > Bruce > > > On Sun, 14 Apr 2013, Marie Schaer wrote: > >> Hi Bruce, >> >> Thanks for your response. Then I assume that I can divide these values by 5 >> and present them as area of the CC on the midline section, right? >> >> Have a nice week-end, >> >> Marie >> >> On Apr 13, 2013, at 5:18 AM, Bruce Fischl <fis...@nmr.mgh.harvard.edu> >> wrote: >> >> Hi Marie >> It is mm^3 of I believe a 5 mm thick cc. We don't measure the >> thickness by default >> Cheers >> Bruce >> >> >> >> On Apr 13, 2013, at 2:18 AM, Marie Schaer <marie.sch...@unige.ch> >> wrote: >> >> >> Hi Bruce, >> >> Thanks for your response. My question was indeed: what is >> the unit of the CC_* output in the aseg.stats? E.g. in the >> attached file, the last 5 rows depict CC segmentation >> measurements (between ~400+ and 900+), and I was wondering >> what was the unit of these measurements. The other values >> are clearly mm^3, but what about the CC? From what I >> understood from Diana Rosas' paper, the CC was measured as >> the thickness / distance from the medial axis of the CC to >> the superior and inferior boundaries, but I may have >> wrongly understood. >> >> Thanks for the clarification, >> >> Marie >> >> >> >> >> >> >> On Apr 12, 2013, at 8:07 PM, Bruce Fischl >> <fis...@nmr.mgh.harvard.edu> wrote: >> >>> Hi Marie, >>> 400 or 900 what? Not mm. How are you calculating thickness? I >> think in Diana's paper it was the radius of the inscribed circle >> on the medial axis, wasn't it? >>> Bruce >>> >>> >>> On Apr 12, 2013, at 10:44 PM, Marie Schaer >> <marie.sch...@unige.ch> wrote: >>>> Hi all, >>>> >>>> I have a quick question related to the corpus callosum >> segmentation: I read in previous posts that the reference >> explaining more about the CC subdivision in 5 segments was the >> one by Rosas et al, Neuroimage 2010. But in this publication, >> you show thickness of the corpus callosum as the main outcome >> variable, with average values ranging from ~4 to 9 mm. And when >> I extract the values from the aseg.stats, in my dataset I rather >> get average values that are ranging between ~400 and 900 >> depending on the segment. Do these values correspond to >> thickness in mm/100, or to area, or to something else? Is that a >> thickness measurement, or a surface area measurement? >>>> Many thanks in advance for your reply, >>>> >>>> Marie >>>> _______________________________________________ >>>> 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. >>> >> <aseg.stats> >> >> >> >> > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer > > -- Dr. Martin Reuter Assistant in Neuroscience - Massachusetts General Hospital Instructor in Neurology - Harvard Medical School MGH / HMS / MIT A.A.Martinos Center for Biomedical Imaging 149 Thirteenth Street, Suite 2301 Charlestown, MA 02129 Phone: +1-617-724-5652 Email: mreu...@nmr.mgh.harvard.edu reu...@mit.edu Web : http://reuter.mit.edu _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
