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 fischl@nmr.mgh.harvard.edu wrote:
Hi MarieIt 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.Schaer@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, MarieOn Apr 12, 2013, at 8:07 PM, Bruce Fischl fischl@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.Schaer@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,
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