HU bone section

Hi, , im new in 3dSlicer,this is a powerfoul software, but im not able to use python, i need export csv from a cilinder selection segmentation .there is a video tutorial or a simple guide to do that?i`paste and copy a script, but my data are replaced from a brain scan.Can someone help me to generate the dada and expot a csv table ?Thanks

I would recommend to start with the PerkLab Bootcamp Slicer programming tutorial.