[Mristudio-users] saving fibers - flipping?

[Miguel Burgaleta]

Hi Hangyi,

Thanks for your email. I'm afraid I'm not able to load my Analyze  
files with MriView3D either. The message is:

CMriView3DDoc()::CreateImgWithAnalyzeFile()
Unrecognized Analyze Header File:

And then the path and filename of the header. Any suggestions?

Thanks again,
Miguel


On Nov 19, 2010, at 3:03 PM, Hangyi Jiang wrote:

> hi, Miguel,
>
> if your file is in Analyze, you should open/load it as Analyze, not  
> Philips REC (athough the .img looks like .rec file) .  their  
> coordinate system are different.  Analyze uses left-hand system, REC  
> is right-handed.
>
> in DtiStudio -> DTI Mapping,  it does't accept Analzye file because  
> it only takes the original DW-Image, not pre-processed images (which  
> may contain scaling factors, and affact the tenosr calculation  
> results).
>
> you may try:  Dtistudio->MriView3D-> load Analyze files  -> resave  
> all images as on "RAW" file and then
>                    Dtistudio->DtiMapping-> load "RAW" file as  
> Philips REC format..... OK
>
>
> basically, when you loaded the Analyze file, the program will adjust  
> its coordinate system accordingly, and re-construct the images  
> correctly.  then, resaved "RAW" file is in same format as that of  
> Philips REC.  in this way, you can processing the "RAW" file as REC  
> format.
>
> regards,
>
> hangyi
>
>
>
>
>
>
>
>
>
> ________________________________
> From: mristudio-users-bounces at mristudio.org [mristudio-users-bounces at mristudio.org 
> ] On Behalf Of Miguel Burgaleta [miguel.burgaleta at uam.es]
> Sent: Friday, November 19, 2010 5:16 AM
> To: DTI Studio, ROI Editor, DiffeoMap Questions/Support
> Subject: Re: [Mristudio-users] saving fibers - flipping?
>
>
> 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
>
>
>
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