[Insight-users] partial segmentation

[Luis Ibanez]

Hi Felix,

One easy way is to use FastMarching.
Put a single seed in the middle of
the tube and select the time to stop
(StoppingValue) in such a way that the
front just reaches the ends of the tube.

If you prepare the speed image for
having a value close to 1.0 inside
the tube, the time to stop will
be about half the height of the tube.

You may want to look at the SoftwareGuide
for an example on how to use the FastMarching
algorithm

    http://www.itk.org/ItkSoftwareGuide.pdf

Section 9.3.1, pdf-page 365.


Another interesting option is to do segmentation
by using model-to-image registration. You could
use the itkTubeSpatialObject as a model and
register it against the image.

For an example on model to image registration,
look at the software guide, Section 8.14,
pdf-page 328.



   Regards,


      Luis


----------------------
Felix Schwenk wrote:

> Hi all,
> i have the following situation:
> an object that could be compared with a tube or something like this. 
> this object is somewhere in the middle of the volume.
> 
> the inside of the object and the outside do have the same value. i would 
> like to segment the inside of the object. therefore
> 
> i'm using connectedthreshold. but as the object is not closed on one 
> side it doesn't work, of course.
> so my question is:
> what would be a good way of closing the object?
> 
> any help appreciated.
> 
> felix.
>