I'm not sure what you mean by a QC rating. For white matter, the volume
will depend upon the boundaries with both subcortical and cortical GM,
so, in theory, you must check both. For eTIV, the value is computed from
the talairach registration, not from a segmentation, so you'd have to
check the registration. see
https://surfer.nmr.mgh.harvard.edu/fswiki/FsTutorial/Talairach_freeview
On 7/22/2021 5:49 AM, Stephanie K wrote:
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Hello,
Can you please clarify the following regarding the quality control of
phenotypes?
How do we perform quality control for cerebral white matter volume
derived using Freesurfer? Do we use the subcortical QC rating for this
the same way as for accumbens (when there is manual inspection?).
Also, is it correct that we do not use subcortical QC rating for
estimated total intracranial volume as this is accurately measured?
Do we use cortical QC rating for all regional cortical measures but
not the global measures (e.g. mean thickness/total surface area) as
these are accurately parcellated?
Sorry for my very basic questions. I am using already processed data
and only using the statistics for brain MRI data
Thanks,
Stephanie
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