[Freesurfer] QDEC Cluster Analysis

Hello All,

I have some questions related to the qdec analysis I have run.

1. On running the qdec I see that FWHM is an input which changes cluster definition significantly. How would I choose the right FWHM for the analysis and can it be related to any imaging parameters?

2. Secondly, on completion of the qdec analysis I want to export the clusters created by the qdec analysis into a volumetric file (which I can later convert to .nii). Please also suggest a way that would let me only export clusters above a particular size threshold.

Thank you very much in advance.

Mohammed Goryawala Department of Radiology University of Miami, Miller School of Medicine