Shame to admit - we didn't think about it. After the visual inspection - something obviously went wrong. We'll try to correct manually. Thanks for the tip!
Best regards, Patrycja
2017-11-28 16:00 GMT+01:00 Bruce Fischl fischl@nmr.mgh.harvard.edu:
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
[icon-envelope-tick-round-orange-animated-no-repeat-v1.gif] Wolny od wirusów. www.avast.com
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.