It all comes down to the registration. See
https://surfer.nmr.mgh.harvard.edu/fswiki/eTIV
The image may have more-or-less neck and that can change the
registration and ICV. The contrast may be different. The scanner may
have had software updates. You might be comparing dewarped vs not dewarped.
On 9/10/2020 2:16 PM, Gonzalo Rojas Costa wrote:
External Email - Use Caution
Hi:
Why I got a big ICV difference between MPRAGE of the same patient
(2019: 1775887.317631, 2020: 1566398.53576 mm3), one-year difference
acquisition, and the same MRI Skyra 3T equipment? I used freesurfer
5.1.0 on the same computer, and operating system in both cases...
I reviewed the coregistration to MNI305 and it is reasonably good in
both cases...
The case was reviewed by an expert neuroradiologist, and she does
not consider that there is a significant visual difference between
both sizes.
Sincerely
Gonzalo Rojas Costa
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