[Freesurfer] recon-all outpputs for deep learning

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Hello Freesurfer experts

I want to apply deep learning to structural brain images processed by Recon-all. My goal is to demonstrate the morphological variation(e.g., gray matter volumes or cortical thickness) of brain regions in structural magnetic resonance imaging using convolutional neural networks (CNN). Then interpret those models on the basis of the region of interest.

But I'm still distracted by the model input . I searched before but still couldn't decide which Recon-all output I should use to perform the task. I think I'll use the folder(mri) but I'm not sure which file.

can any one guide me .

Thanks,