[Rtk-users] Few questions about FirstReconstruction.cxx

[Simon Rit]

Hi,
No, this is not a bug. This image is filled with 0 values so that's what
you expect. This is the input image in which you are going to reconstruct.
RayEllipsoidImageFitler calculates analytically the intersection between an
ellipsoid defined by it's semi axes and it's density and the rays defined
by a stack of projections and a geometry file. You should therefore get a
stack of projections of an ellipsoid.
Simon

On Fri, May 15, 2020 at 6:31 AM 나윤호 <yoonho94.na at gmail.com> wrote:

> Hi everyone.
>
> I am studying RTK with FirstReconstruction.cxx.
>
> right now I am visualizing every step to understand it.
> (visualize using view from itkwidgets)
>
> and I have few questions about it.
>
> first,
> when I visualized ConstantImageSource I could see rectangular shape
> by clicking X, Y, Z plane. but I couldn't see in 3d volume shape.
> Is it a bug?
>
> and second,
> what is RayEllipsiodIntersectionImageFilter?
> I visualized the output after constantimagesource
> going through RayEllipsoidIntersectionImageFilter.
> the shape was like a curved cylinder.
> I also saw docs
> <http://www.openrtk.org/Doxygen/classrtk_1_1RayEllipsoidIntersectionImageFilter.html> but
> I still don't get it.
> someone give me an intuition please.
>
> Best regards.
>
> Yoonho.
>
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