Hi Patrycja

did you check to see if the talairach transform was reasonably accurate?

cheers
Bruce
On Tue, 28 Nov 2017, Patrycja Naumczyk wrote:

Hi experts!
We are doing some QA exams with one subject scanned on different 3T scanners (with comparable/nearly
identical imaging parameters). Afterwards, we looked into aseg values to compare them with the
standard recon-all procedure. And we came across a strange result. Between two scanners the raw
volumes are roughly the same, but the eICV's differ a lot (almost 30%). We looked into the data and
found that even the mask volumes are alike (they differ less than 5% between the machines). the only
outlier value is the eICV of one of the scanners. As this value is estimated, can this be a marker
of some difficulties in normalization to Talairach upon the data of the scanner? Should it be
alarming when an eICV is 30% lower than the mask volume? 

Best regards,
Patrycja

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