I had no answer to these my simply questions.
I 'm working with PET images in order to superimpose normal patient to patients with desease.
- Do I need to realign different PET scans from different normal patients (one scan for eash patient)? If yes, in the realignment, the smoothing (FWHM) to be used for PET images is 5 or 7? In the SPM manual it is written 7 but the default value for PET is 5.
- When I'm doing the normalisation, in the writing options, I have to use "preserve amount" or "preserve concentrations"? My feeling is for the first one. And about the voxel size, I have to leave the default values (2 2 2)?
- it is fine 12 for the FWHM of the smmothing?