[Insight-developers] fast marching and paths

[Luis Ibanez]

Hi Richard,

There is no direct support right now for extracting paths, but here are
two options that come to mind for implementing this functionality:


   1) Intercept the update process of FastMarching in lines 510-520 or
      the file Insight/Code/Algorithms/itkFastMarchingImageFilter.txx.
      This is reasonable if you want to track the evolution of a couple
      of points in the front.

OR

   2) Let FastMarching run, and then take the gradient (vector field)
      of the time-crossing map at the end of the filter's execution.
      In this context you could use a similar approach to what is
      currently used for fiber tracking.  In particular, VTK has a
      couple of filters that will help with generating stream lines
      out of vector fields.



  Regards,


     Luis



-----------------------
Richard Beare wrote:
> Hi everyone,
> 
> One of the widely reported applications of fast marching is in various
> forms of path extraction. I believe this is done by computing the
> arrival times at every point using fast marching and then backtracking
> to the source point using gradient information. I haven't been able to
> find any support for this in the ITK fast marching filters - can
> anyone suggest where it might be hidden away?
> 
> Thanks
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