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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> Freesurfer mailing list
> Freesurfer@nmr.mgh.harvard.edu
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