[Freesurfer] Extracting CRAS from nifti (mri_info)

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Dear Freesurfer team, I am a user of freesurfer. The tool mri_info provides me useful information from nifti files. As part of my project, I am using VTK to programmatically extract information like direction matrix, size, origin etc from a nifti file. However, I am unable to extract --cras information from a nifti file. Could you please throw some light on how I can extract the CRAS values from a NIFTI file using matlab or vtk or itk ot nibabel? If the CRAS values are computed, I would like to know how they are computed. Basically, I am trying to understand how I can get the CRAS values without using mri_info tool. Thanks in advance!

Regards, Sherin Sugathan