[vtkusers] Create an approximate cross-section of a RT ROI

[Scott Johnson]

Hello Xiaofeng,

 

I'm not working with scenes that are that complex, but I don't see a delay as I move through image slices with 2 ROIs.

 

I'll try vtkPolyDataMapper2D.  Thanks for the pointer.

 

                                -- Scott

 

From: Xiaofeng Z [mailto:xf10036 at hotmail.com] 
Sent: Tuesday, May 04, 2010 10:04 AM
To: lars-friedrich at gmx.net; Scott Johnson; VTK
Subject: RE: [vtkusers] Create an approximate cross-section of a RT ROI

 

Scott and lars,
 
Since you are working on the similar thing, I would be interested to know how satisfactory is the performance (how long does it take to cut in a typical RT case of 20 or so ROIs).  create a surface from the contours and use vtkCutter to get the cross-section is certainly a more "accurate" way than the rudimentary method of connecting the points, but in myexperience, the cutting of a typical RT case takes over a second.  I can't use that in real time.

Also I found that using vtkPolyMapper2D in conjuction of vtkActor2D makes a better contour display (no artificial shifing of the contour, etc.).  Make sure to set the transformation of the mapper to world coordinate system:
 
vtkCoordinate* coordinate = vtkCoordinate::New();
coordinate->SetCoordinateSystemToWorld();
vtkPolyDataMapper2D* mapper = vtkPolyDataMapper2D::New();
mapper->SetColorModeToDefault();
mapper->SetTransformCoordinate(coordinate);
 
Regards,
Xiaofeng


 
> Date: Tue, 4 May 2010 16:36:14 +0200
> From: lars-friedrich at gmx.net
> Subject: Re: [vtkusers] Create an approximate cross-section of a RT ROI
> To: Scott.Johnson at neuwave.com; vtkusers at vtk.org; xf10036 at hotmail.com
> 
> Scott,
> 
> I had a similar problem with 'free planes' at the beginning, but I usually define the cut plane 'a bit' (0.001 mm or so) in front of the image slice (towards view position).
> 
> regards,
> 
> lars
> 
> -------- Original-Nachricht --------
> > Datum: Tue, 4 May 2010 09:12:33 -0500
> > Von: "Scott Johnson" <Scott.Johnson at neuwave.com>
> > An: "Xiaofeng Z" <xf10036 at hotmail.com>, "VTK" <vtkusers at vtk.org>
> > Betreff: Re: [vtkusers] Create an approximate cross-section of a RT ROI
> 
> > Hello Xiaofeng,
> > 
> > 
> > 
> > I've been working on something similar, but am not quite there yet. I
> > can get you started.
> > 
> > 
> > 
> > The general idea is that you will need to create a polygonal shape from
> > the contours in the RT structure set, then create a vtkPlane which
> > represents the plane you wish to cut. You can then create a pipeline
> > which looks something like:
> > 
> > 
> > 
> > vtkCutter -> vtkPolyDataMapper -> vtkActor
> > 
> > 
> > 
> > Set the properties of the actor to have EdgeVisibilityOn and an
> > EdgeColor or the cut shape will not be visible. The actor will show a
> > cross section of the ROI intersected with the plane.
> > 
> > 
> > 
> > The issue I'm having is properly displaying the vtkActor with the
> > images. I've extended beyond axial sagittal and coronal and I seem to
> > be missing something in the coordinate conversions.
> > 
> > 
> > 
> > Good luck.
> > 
> > 
> > 
> > -- Scott
> > 
> > 
> > 
> > From: vtkusers-bounces at vtk.org [mailto:vtkusers-bounces at vtk.org] On
> > Behalf Of Xiaofeng Z
> > Sent: Monday, May 03, 2010 7:12 PM
> > To: VTK
> > Subject: [vtkusers] Create an approximate cross-section of a RT ROI
> > 
> > 
> > 
> > Hi vtkUsers,
> > 
> > I have a set of contours in axial orientation representing a ROI. I
> > need to sketch the ROI in coronal and sagittal plane, by connection the
> > points made from the intersection of the contours and the cutting plane.
> > Is there a function to do that in vtk or in ITK?
> > 
> > I know the result is not "precise" in a sense that the contours make
> > this way is not always consistent between themselves. But it seemed to
> > be the only viable way to sketch a ROI in a multi-planar rendering in
> > real time.
> > 
> > Many thanks!
> > Xiaofeng
> > 
> > 
> > 
> > 
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