[Mristudio-users] fiber tracking and tensor transformation algorithms

[Xin Li]

Hello,

To understand the tensor transformation algorithm, please refer to this paper.

Spatial Normalization of Diffusion Tensor Fields 
by Dongrong Xu, Susumu Mori
Magnetic Resonance in Medicine 50:175-182 (2003)


>  Another two small questions about LandMarker:
>  1. Is the overall matrix combining AIR transformation and LDDMM in 
> the same 
>  format as LDDMM raw?

Yes.


>  2. I found two channel LDDMM finished much faster than single channel 
> LDDMM 
>  (2 channels in about 2 hours, and single channel ain bout 48 hours). 
> Is that 
>  normal? I am just curious.

It is not normal. It shouldn't take 48 hours to process any data. Please try again. If you still have the same problem, please let me know.


Xin


----- Original Message -----
From: Yi Jiang <yj3 at duke.edu>
Date: Friday, August 28, 2009 4:21 pm
Subject: [Mristudio-users] fiber tracking and tensor transformation	algorithms
To: "DTI Studio, ROI Editor,	Landmarker Questions/Support" <mristudio-users at mristudio.org>


> Hello,
>  
>  I am using DTIstudio to track fibers and using LandMarker to register 
> the 
>  brains and transform (reorient) tensors in each brain by the overall 
> matrix 
>  combining AIR linear affine and LDDMM.
>  
>  May I have a simple description about the fiber tracking algorithm 
> (FACT or 
>  other?) in DTIstudio, and the tensor transformation (reorienting 
> )algorithm 
>  (preserve the principal direction? or other?) in LandMarker? And I 
> would 
>  like to have the references to the above algorithms (tracking, 
> registration, 
>  and tensor transformation) so I can cite in my paper.
>  
>  Another two small questions about LandMarker:
>  1. Is the overall matrix combining AIR transformation and LDDMM in 
> the same 
>  format as LDDMM raw?
>  2. I found two channel LDDMM finished much faster than single channel 
> LDDMM 
>  (2 channels in about 2 hours, and single channel ain bout 48 hours). 
> Is that 
>  normal? I am just curious.
>  
>  Thank you very much for your help!
>  
>  Best,
>  Yi
>  
>  
>  _______________________________________________
>  Mristudio-users mailing list
>  Mristudio-users at mristudio.org
>  
>  Unsubscribe, send a blank email to: Mristudio-users-unsubscribe at mristudio.org