[vtkusers] Surface rendering in VTK

[安 继业]

Dear Mathieu,

Thank you very much for the suggestion.

I have taken a look at ITK and found that it is mainly used for 
segmentation and registration. And it does not address visualization. I 
think maybe I didn't describe my requirements clearly. In my application, 
the purpose is to visualize the CT slices from two studies and get the 
world coordinates of some specified point from the volume. These interested 
points may come from the surface of some organ. Can VTK achieve this goal?

By contouring, I mean it maybe a method to get better visualizing result. 
Of course accurate segmentation will be needed at last, but now I want to 
concentrate on the following things:

1. Give a 3D visualization result of a CT study, the result should contain 
multiple surfaces include the body and some organs.

2. Display two 3D results from two studies together for comparison purpose. 
The two studies is of the same person at different time.

3. Select interested points from each 3D result and give the coordinate of 
the selected points. Then I can calculate the shift vector of each two 
corresponding points from the two studies.

4. Save the visualization result(information of multi-surfaces) into a file 
of STL format so that it can be reused by some other software tool.

Then what do you think about using VTK to do these? Is a segmentation 
process necessary? I just want to make it as simple as possible and to 
achieve the above goals as soon as possible. This tool is developed for 
some other research project.

Thank you very much again.

Best Regards,
Jiye An


>From: Mathieu Malaterre <mathieu.malaterre at kitware.com>
>To: 安 继业 <an_jiye at hotmail.com>
>CC: vtkusers at vtk.org
>Subject: Re: [vtkusers] Surface rendering in VTK
>Date: Mon, 02 Feb 2004 19:19:35 -0500
>
>This typically looks like you should be using ITK instead of VTK:
>
>	http://itk.org
>
>Mathieu
>
>安 继业 wrote:
> > Hello, I am a newbie of VTK. Here I have some questions about surface
> > rendering.
> >
> > I have some DICOM images from a CT study. I want to visualize them with
> > surface rendering technique. I am interested in the surfaces of the 
body
> > and some inside organs, and the body should be displayed in
> > semi-transparent mode in order to make the inside organs visible. Can
> > anyone give me some suggestions about how to do this with VTK? Do I 
need
> > to mark the contour of the body and organs in each slice manually? Are
> > there some similar samples?
> >
> > Another requirement is that, I'd like to display two or more studies in
> > one window for comparison. After that, I will pick some interested
> > points from the volume using mouse. The coordinates of the picking 
point
> > is wanted. The final purpose is to calculate the shift vector of the 3D
> > point pair from two studies, these two points stands for the same
> > physical part of human body or organ. To ensure the shift vector make
> > sense, the coorndinates of the two volumes must be exactly the same.
> >
> > Now I can read files of DICOM format and get the original gray value
> > matrices of each slice. But I wonder how to visualize the multiple
> > surfaces from these slieces and how to retrieve the coordinates of the
> > picking points from the two volumes.
> >
> > Any suggestion will be appreciated. Thand you in advance.
> >
> > Jiye An
> >
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