[Insight-users] Searching for Optimal Path in 3D vectorfieldImage?

[Patrick (Peng) Cheng]

Hi,
The problem is: sometimes you can't just follow the principal vector direction.
Coz sometimes fiber cross each other, so the singal overload on each other, and the major vector direction
may not be the direction you want to go if you want to find out the connectivity between two region. (we already know there is certain connection)
How do I find the optimal path then? coz if I follow the principal direction, I found I can't reach the ending region at last.
thanks a lot
 
---------------------------
Peng (Patrick) Cheng
Biomedical Engineering
University of Iowa
Tel:(319) 400-7442
Email: peng-cheng at uiowa.edu

===========2004-07-01 10:07:11 You wrote in your letter:==============

>You could follow the principal direction of the tensor with the largest
>corresponding eigenvalue.  In areas with very low anisotropy this would not
>make sense so, in those areas the fiber should stop!
>
>It can still be done using streamlines...
>
>Greetz,
>
>
>Toon.
>
>----- Original Message ----- 
>From: "Patrick (Peng) Cheng" <peng-cheng at uiowa.edu>
>To: "Toon Huysmans" <denhuys at hotmail.com>; "insight-users"
><insight-users at itk.org>
>Sent: Thursday, July 01, 2004 6:41 PM
>Subject: Re: Re: [Insight-users] Searching for Optimal Path in 3D vector
>fieldImage?
>
>
>> Thanks Toon,
>> Yeah, the thing is there are three direction to follow at each voxel with
>different weight not only one.
>> I want to find the optimal path between two points. It's kinda like
>dynamic programming
>> But I don't know how to do it in 3D
>> ---------------------------
>> Peng (Patrick) Cheng
>> Biomedical Engineering
>> University of Iowa
>> Tel:(319) 400-7442
>> Email: peng-cheng at uiowa.edu
>>
>> ===========2004-07-01 08:52:46 You wrote in your letter:==============
>>
>> >   Use the vector as a velocity and direction of movement, then integrate
>> >the a position over time, this should run trough the corresponding fiber
>i
>> >think.  Maybe you can use streamlines:
>> >
>> >    vtkStreamer
>> >
>> >Greetings,
>> >
>> >Toon.
>> >
>> >----- Original Message ----- 
>> >From: "Patrick (Peng) Cheng" <peng-cheng at uiowa.edu>
>> >To: "insight-users" <insight-users at itk.org>
>> >Sent: Thursday, July 01, 2004 4:45 PM
>> >Subject: [Insight-users] Searching for Optimal Path in 3D vector field
>> >Image?
>> >
>> >
>> >> Hi everybody,
>> >> I am doing a fiber tracking on a 3D vector image. I want to find out
>the
>> >connectivity between two regions.
>> >> So I am trying to find the optimal path which follows the vector field.
>> >> Can anybody give some hint or clue to do this?
>> >> ---------------------------
>> >> Peng (Patrick) Cheng
>> >> Biomedical Engineering
>> >> University of Iowa
>> >> Tel:(319) 400-7442
>> >> Email: peng-cheng at uiowa.edu
>> >>
>> >>
>> >>
>> >>
>> >> _______________________________________________
>> >> Insight-users mailing list
>> >> Insight-users at itk.org
>> >> http://www.itk.org/mailman/listinfo/insight-users
>> >>
>> >_______________________________________________
>> >Insight-users mailing list
>> >Insight-users at itk.org
>> >http://www.itk.org/mailman/listinfo/insight-users
>> ================================================================
>>
>>
>>
>>
>_______________________________________________
>Insight-users mailing list
>Insight-users at itk.org
>http://www.itk.org/mailman/listinfo/insight-users
>.
================================================================