[Insight-users] Fast Marching Filter produces blank output

[Charlotte Curtis]

Thanks Dan, I'll see if I can save those images and put them up tomorrow
when I get back to school.  I really do hope it's something I'm doing wrong
and not a problem with the program.

On 9/27/07, Dan Mueller <dan.muel at gmail.com> wrote:
>
> On 28/09/2007, Charlotte Curtis <curtisc at uoguelph.ca> wrote:
> > I'm using ITK filters through MeVisLab, it comes with nearly all of them
> > implemented as modules.
>
> Okay.
>
> > It was my understanding that the stopping value should be somewhere
> around
> > the values of the voxels at the edge of the region, which for me is
> > somewhere between 200 and 1000 HU.  I've tried using very large numbers,
> but
> > I still get nothing output.
>
> The stopping value has nothing to do with the intensity range of the
> input image -- it tells the algorithm at what *arrival value* the
> processing should stop. If you are not sure, make the value large or
> use the default (which will force the algorithm to take longer to
> execute, but guarantee you a result).
>
> > I posted a screenshot from the program showing (left to right): the
> input
> > image, the FastMarching dialogue box, and the speed image.  It can be
> found
> > at http://www.uoguelph.ca/~curtisc/MeVisScreenshot.png.
>
> Unfortunately a screenshot doesn't help very much. It is best to
> inspect the raw data (especially the speed function to ensure it is in
> the correct range). Can you temporarily save the speed function you
> are using and post this? Also, the initial trial seed/region would be
> helpful.
>
> Cheers, Dan
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://public.kitware.com/pipermail/insight-users/attachments/20070927/807db828/attachment.html