[Freesurfer] white matter segmentation incorrect after intensity change

Hi FreeSurfer experts,

After running -autorecon2 and -autorecon3, we're seeing issues for some of the subjects, which now start showing changes in intensity/brightness in some voxels, and this increased intensity is now missed by the white matter and grey matter segmentation, and is labeled as non-brain matter.

Attached is an example of a subject's brain that was segmented incorrectly, which we think is due to the intensity around that frontal region. We hadn't added control points in that region, so we are unsure what the cause of the intensity change is. In our first pass before running -autorecon2 -autorecon3, we did not notice this error or the intensity values to be so bright for that region.

Thanks for your help!

BR