[Insight-users] Colliding front level set filter

[Luca Antiga]

Hi Gaurav,
  I'll just add a detail to make sure what the filter does is clear:  
the outcome of the filter is
a region (in general not a line) between the two seed points.
Note that you may need to threshold the input image in order to limit  
wave propagation
to the intensity range of your vessels.
You can find an example of colliding fronts in action here
http://www.vmtk.org/Main/Screenshots (third image from the top)
Best regards

Luca


On Feb 16, 2010, at 12:21 AM, Luis Ibanez wrote:

> Hi Gaurav,
>
> The outcome of the filter will be the sequence of
> pixels that trace a line between the two seed points,
> and follows the intensities of the image.
>
>
> If you also need to segment the inflated portion of
> the aneurysm, then you could follow up this with a
> standard FastMarchingImageFilter segmentation.
>
> This filter is described in the ITK Software Guide
>
>     http://www.itk.org/ItkSoftwareGuide.pdf
>
> and you will find examples in
>
>            Insight/Examples/Segmentation
>
> as well as interactive applications in
>
>     InsightApplications/FastMarchingLevelSet
>
>
>
>    Regards,
>
>
>            Luis
>
>
> ------------------------------------------------------------------------------------------------------------
> On Mon, Feb 15, 2010 at 6:08 PM, Gaurav Sharda
> <gaurav.sharda.uiowa at gmail.com> wrote:
>> Hi!
>>
>> Sounds good. Still a little curious as to what will happen when we  
>> pass two
>> seed points.
>> Will it trace out the region i.e. in this case the aneurysm and the
>> corresponding vessel.
>> I know am bugging you a lot. Sorry..
>>
>> And thanks a ton for your help so far.
>>
>> Thanks,
>> Gaurav
>>
>> On Mon, Feb 15, 2010 at 4:59 PM, Luis Ibanez  
>> <luis.ibanez at kitware.com>
>> wrote:
>>>
>>> Hi Gaurav,
>>>
>>> In order to use this filter you need to pass two seed points,
>>> one at each end of the vessel that you want to extract.
>>>
>>> You could put one seed point in the aneurysm and the other
>>> in one section of the vessel in which the aneurysm is located.
>>>
>>> You will find a source code example on how to use this
>>> class in the file:
>>>
>>>
>>>      Insight/Testing/Code/Algorithms/
>>>                      itkCollidingFrontsImageFilterTest.cxx
>>>
>>>
>>>
>>>     Regards,
>>>
>>>
>>>               Luis
>>>
>>>
>>>
>>> ----------------------------------------------------------------------
>>> On Mon, Feb 15, 2010 at 5:51 PM, Gaurav Sharda
>>> <gaurav.sharda.uiowa at gmail.com> wrote:
>>>> Hi !
>>>>
>>>> Can you give information about the Colliding level set filter. I  
>>>> mean
>>>> any
>>>> example or sample codes that could help me in understanding the  
>>>> use of
>>>> this
>>>> filter in segmenting brain aneurysm and its corresponding vessel  
>>>> only
>>>> from
>>>> 2D cerebral angiograms?
>>>>
>>>> Thanks,
>>>> Gaurav.
>>>>
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>>
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