[Insight-users] Geodesic Active Contour giving negative levelset both inside and outside of vessel and padded boundary

[Dan Mueller]

Hi Liza,

The output of your sigmoid seems to be the issue. Can you please
describe step-by-step what you are doing to generate the speed
function?

Perhaps consider posting code and data so we can easily reproduce your issue.

Regards, Dan

On 26 June 2013 00:56, liza <lizashr at outlook.com> wrote:
> Hi Dan,
>
> Thank you for your reply. My initial levelset does have negative values
> inside the initial contour. And even in the result of the geodesic
> ActiveContourLevelSetImageFilter, I am getting negative levelset inside of
> my object. But the problem is I am getting negative levelset on the outside
> of my object too. I have attached a result of my segmentation after
> geodicactivecontourlevelsetimagefilter.
>
> Though I apply binary thresholding after this, I am getting things inside
> aneurysm to be white and everything outside aneurysm to be white too and
> then the image has black padding on the boundary. I have attached the result
> of final binary threshold filter too.
>
> Thanks,
> Liza...
>
> I think this problem is occurring because the aneurysm geometry that I have
> is acting as a hollow object rather than a solid object as we can see in the
> result of sigmoid filter-(SigmoidResult.png)
> <http://itk-insight-users.2283740.n2.nabble.com/file/n7583372/SigmoidResult.png>
>
> <http://itk-insight-users.2283740.n2.nabble.com/file/n7583372/Screenshot-5.png>
> <http://itk-insight-users.2283740.n2.nabble.com/file/n7583372/BinaryThresholdResult.png>
>
>
>
> -----
> Liza
> --
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