Hi Gonzalo,
images across scanners are not comparable. You basically change
everything there is: vendor, field strength.
In addition to that, even if you used the same scanner three years
later, there is lot's of reasons, a brain can look larger:
- less motion artefacts
- better hydration leve
Hola Gonzalo,
field strength affects T1, so different field strengths (e.g., 1.5T vs
3.0T) give somewhat different T1 contrast, which Freesurfer uses to
estimate surfaces and boundaries to then thickness and volumes. You
would have probably found also morphometric differences even if you
would
Hi:
We have GE 1.5T MRI fspgr volumetric acquisition of a MS patient (39 years
old) and a Siemens 3T MRI mprage acquisition of the same patient three
years after (42 years old)... we processed that images to got the volume of
some structures that we need and compare... but, we found that multiple
b
