Dear experts,
What is your opinion on comparing longitudinal data from the same set of subjects at different time points but they were scanned in a different field strength? For example, a group of neonates was scanned at birth using a 1.5T scanner and they came back for a second scan using a 3T scanner.
Is it valid to compare the data if most parameters were the same in the protocol? (Metabolite measurements were in ratio of tCr or water)
Thank you,
Steve