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Hello FreeSurfer developers, 

I am attempting to run the mri_normalize function on T1 MPRAGE data and some of my subjects get an error:

Iterating 2 times

-------------

3d normalization pass 1 of 2

error: No such file or directory

error: MRInormFindControlPoints: could not find enough control points

error: No such file or directory

error: MRInormFindControlPoints failed

This error comes up with some subjects but not others in the group with the same acquisition details. It is cross vendor (it has  come up for both Siemens and Philips). 

Strangely enough, when I gave the data to someone else to run on their end, mri_normalize worked just fine... they are running FreeSurfer 5.3.0. 

On my own computer, running freesurfer version 7,  I can get it to work by changing the orientation using mri_convert... though most subjects work with the original input orientation, and I would prefer not to have to do what feels like an arbitrary orientation change.

Do you know why this could be happening? Were there any changes made to the mri_normalize function between v5.3.0 and v7?

Thank you so much for any advice.

Zoe O'Brien-Moran

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