Hi,
I am interested in applying AlphaSim to a PET dataset.
I learned from an older post that I could use 3dFWHMx to estimate smoothness for PET data using the -2difMAD option.
This however retrieved 0 smoothness to the data, which I know is not true.
To understand what the error was I then tried to apply 3dFWHMx to a PET dataset available at the SPM website (PET motor), which has 8mm FWHM. However, 3dFWHMx gave the following values for one of the PET images 4.49814 1856.25 3712.49 (314.132), which is a much higher value than the expected.
Any ideas of what could be wrong?
Thank you very much,
ines