[Mristudio-users] saving fibers - flipping?

[Miguel Burgaleta]

Hi Susumu,

Not sure if that solves my problem... Also, Hangyi's answer was:

> please beware that the Analyze file is in Format 7.5.  it is left- 
> handed  system.
> if you loaded it as Nifti-Analyze,  the program may loaded as Nifti  
> format, which is right-hand system.


Let me give you more info.

I processed my DWI in FSL for motion and eddy currents correction.  
Saved the images as 4D with .img extension, and opened them in  
DTIStudio as REC (the only option that worked out... when trying to  
open as Analyze, it complained about the header. None of the other  
format options worked). Did the fiber tracking and saved the fiber as  
Analyze.

Please see attached a capture of a small bundle (but strategically  
located in the brain to track potential rotations) as it was  
reproduced in DTIStudio, and then opened with fslview. First, in  
DTIStudio, right seems to be right. Second, it looks like, when  
importing into FSL, the fiber is flipped along the AP and SI axes, and  
perhaps LR as well...

This looks like a real mess...Any suggestions? Perhaps start from the  
scratch?? ;)
Thanks,
Miguel






On Nov 16, 2010, at 3:43 AM, susumu mori wrote:

> Do you think FAQ15 in https://www.mristudio.org/wiki/faq answers the  
> question?
>
> On Sun, Nov 14, 2010 at 7:25 PM, Miguel Burgaleta <miguel.burgaleta at uam.es 
> > wrote:
>
> Hi DTIStudio experts,
>
> I am saving my fibers in Analyze format and trying to export them into
> FSL to do some stats in batch mode, but the resulting binary files
> seem to experience an unexpected anterior-posterior flipping. I was
> wondering if this is a known issue. Any advice to safely export fibers
> will be highly appreciated.
>
> Best,
> Miguel
>
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