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Hello, I am using FreeSurfer 8.2.0 and noticed some enclosed holes in the intracranial cavity (ICC) mask produced by recon-all. The holes appear in several slices, and they account for approximately 3% of voxels in one subject. Could you let me know:

1. Is this expected behavior for the ICC mask? 2. Is there a FreeSurfer option or recommended command to avoid or fill these holes?

I have attached an anonymized screenshot showing an example. [cid:0c624e69-4e2b-463c-a0cc-5181c59362b3]

Thanks, Thomas Cajgfinger --Confidentiality Notice: This e-mail transmission may contain restricted, confidential, and/or legally privileged information that is intended only for the individual(s) or entity(ies) named in the e-mail address(es), or the individual(s) or entity(ies) reasonably understood to be the intended recipient(s) via the content or context of the transmission. If you are not the intended recipient, any disclosure, copying, distribution, or reliance upon the contents of this e-mail is by you is prohibited. If you have received this transmission in error, please reply directly to the sender to notify them of their error then immediately delete the message.