Thank you both very much for your responses.
I have changed my approach to use a factorial design (which gives me very similar, although slightly less extensive group differences than when the scanner was modelled as a covariate).
In this case both sets of data were collected using the same scanning parameters and voxel sizes, so I have entered all images from both scanners at the stage when creating a study specific template in DARTEL. I have another data set, however, where the voxel size is different – would this follow the same procedure at this template creation stage, or would it be best to use a different approach?
Thank you,
Jess.
|