It should be related to the SNR, but including it as a noise measure
regressor in a GLM sounds dicey to me.
On 8/6/2020 5:02 AM, Scheffler, F, Mev [fre...@sun.ac.za] wrote:
External Email - Use Caution
Dear FreeSurfer Devs
I got a comment about including a SNR variable in my main stats
analysis and so came across a Rosen et al 2018 paper which refers to
the Euler number. I then checked the archives and came across a thread
<https://www.mail-archive.com/freesurfer@nmr.mgh.harvard.edu/msg58748.html>
where you say that in version 6.0 the numbers are included in the
aseg.stats file, specifically as a global measure called SurfaceHoles.
With regards to our QC procedures: We visually inspected all of our
scans and then followed ENIGMA’s quality assessment protocols. We
excluded scans with motion artefacts or poor-quality images and only
included the data from the scans with acceptable or good quality
segmentation. Outlier detection and the distribution of our data was
also checked prior to analysis of the data.
So, my question is, can I include the SurfaceHoles variable in my
model as a proxy for SNR? Would that be sensible, or do you have an
alternative suggestion?
Thanks very much!
Kind regards,
Freda Scheffler
PhD Candidate
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