you should post your question to the FSL list (they developed and support flirt)
On 02/21/2018 05:34 PM, Yixin Ma wrote:
Hi freesurfer developers and users,
I'm writing to ask about the search angle limitation (--searchrx, -- searchry and --searchrz) in the flirt function. I use the search angle option a lot for limited angle search, which usually generate a better registration result compared with the broad angle search. But I still don't quite understand how rx,ry and rz are defined and how negative and positive angles affect the result. Because sometimes I find the result after the angle limitation does not align well with my expectation of rotation angle.
Thank you for your help,
Yixin Ma
Brain Image and Analysis Center
Duke university
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