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Hi Jamie, It’s a message from mri_robust_register in the initialization of the atlas position. If the finaloutput looks reasonable (which it mostly likely will), don’t worry too much. Cheers, /Eugenio

-- Juan Eugenio Iglesias ERC Senior Research Fellow Centre for Medical Image Computing (CMIC) University College London http://www.jeiglesias.com http://cmictig.cs.ucl.ac.uk/

From: freesurfer-bounces@nmr.mgh.harvard.edu on behalf of Jamie Hanson jamielarshanson@gmail.com Reply-To: Freesurfer support list freesurfer@nmr.mgh.harvard.edu Date: Friday, 10 August 2018 at 17:13 To: "freesurfer@nmr.mgh.harvard.edu" freesurfer@nmr.mgh.harvard.edu Subject: [Freesurfer] Hippocampal subfield registration question.

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Dear FS List,

I was just started to run hippocampal subfield segmentation and had a question about registration (and a related output warning). In the ~5 test subjects I've tried the SF routine, I get a warning early on that says--

********************************************************** * * WARNING: Registration did not converge in 5 steps! * Problem might be ill posed. * Please inspect output manually! * **********************************************************

Two questions-- 1) Is that anything to be concerned about? 2) If so, are there relevant documents regarding checking the outputs to flag potential poor registration/segmentation?

Any information or thoughts are greatly appreciated! Thanks much!

All the best, Jamie.

-- Jamie Hanson Assistant Professor, Psychology Research Scientist, Learning Research and Development Center University of Pittsburgh Personal website: jamiehanson.orghttp://jamiehanson.org