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

[Scott Johnson]

Thanks Lars.

I got around that problem, but now I've moved to using vtkImageReslice for creating the other slice orientations and the ROI slice is floating out in space away from the images.  It works fine for the axial but sagittal, coronal, and oblique slices of the ROI are in the wrong location.

I've been playing with origins, centers, and positions of the vtkActor connected to the vtkCutter without any luck.

		-- Scott

-----Original Message-----
From: Lars Friedrich Lars [mailto:lars-friedrich at gmx.net] 
Sent: Tuesday, May 04, 2010 9:36 AM
To: Scott Johnson; vtkusers at vtk.org; xf10036 at hotmail.com
Subject: Re: [vtkusers] Create an approximate cross-section of a RT ROI

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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