Using freesurfer-linux-centos7_x86_64-dev-20230216-9bc2be6, I receive an error following mri_synthsr.
get_data() is deprecated in favor of get_fdata(), which has a more predictable return type. To obtain get_data() behavior going forward, use numpy.asanyarray(img.dataobj).
* deprecated from version: 3.0
* Raises <class 'nibabel.deprecator.ExpiredDeprecationError'> as of version: 5.0
resuming program execution
Since this seems to be a python problem, I am using python 3.7.7 and python 3.9.12, and neither seem to work.