I am beginner for FreeSurfer... I want to run recon-all on my MRI T1 data. I have a series of dcm files for an individual and these dcm files are archived in a tgz file. What should I import to FreeSurfer for recon-all? A single dcm file, or some selected dcm files, or all dcm files, or the archived tgz file? Do I need to convert these dcm files to  certain types of files?

Thank you!

Jiajun