Hi Till and Alfonso,

I was wondering whether all the sites in your data had same fMRI acquisition protocol and scanner models (such as GE / Philips etc)?

I am also looking into combining the data acquired from different scanner models (Philips + Siemens) and of course the protocols are not exactly the same. Can the multi-site 2nd-level covariate correction method be applied to the data with different scanner brands and MRI protocol? The data I have is both structural and functional scans from dementia cohorts and the aim is to combine the matching subjects from different sites into one fMRI analysis pipeline and investigate the different hypothesis?

Thank you!,

Regards,
Dilip Kumar