[Insight-users] Selecting the sigma for the vesselness

[Chris McIntosh]

Hello,

I'm not sure if this helps, but just in case.

In general, using a constant sigma for an image is troublesome because 
the ideal scale for each vessel
is the actual radius of that vessel (in voxels). So you need a different 
scale at each voxel.

I would suggest looking at:
http://hdl.handle.net/1926/558

They implement a powerful multi-scale technique for vessel filtering, 
where each pixel's response
is tested under a range of scales and the maximal response is taken.


Cheers,

Chris

rashedk wrote:
> Hi everyone, 
>
> I am currently using the vesselness filters to detect vessels. I use a
> pipeline with HessianRecursiveGaussianImageFilter and
> Hessian3DToVesselnessMeasureImageFilter filters which works fine. However, I
> am using a trial and error approach for selecting the sigma. In a previous
> post I came across an approach whereby sigma selection can be done
> effectively by observing the responses of a single pixel that is known to be
> part of a vessel (a.k.a multi-scale analysis). How do I constraint the above
> filters to only process a single pixel and not the entire image? 
>
> Thanks, 
>
> Rashed Karim
>