[vtkusers] Fwd: Re: RE: Create an approximate cross-section of a RT ROI

Tue May 4 12:44:43 EDT 2010

Some vtkCutter and vtkVoxelContoursToSurfaceFilter test example should tell the story well.

Xiaofeng

> Date: Tue, 4 May 2010 17:12:31 +0100
> Subject: Re: [vtkusers] Fwd: Re: RE: Create an approximate cross-section of a RT ROI
> From: jothybasu at gmail.com
> To: xf10036 at hotmail.com
> CC: lars-friedrich at gmx.net; vtkusers at vtk.org
> 
> Hi Guys,
> 
> You seems to be creating some dicom RT viewer, are you importing RT
> structs into your applications and converting into 3D meshes. If yes,
> could some one give me the steps involved in that, maybe some
> flowchart type ( or if you don't mind, the function in any language).
> After some time I might have to do this , so if anyone can give me
> some guidance so my life will be easier :).
> 
> Thanks,
> 
> Jothy
> 
> On Tue, May 4, 2010 at 4:59 PM, Xiaofeng Z <xf10036 at hotmail.com> wrote:
> > Thanks for the information.  I may revisit this later.  Maybe I did
> > something wrong that causes the performance issue.
> >
> > I use a dual Xeon computer.  Although I have eight processing cores, the
> > speed of each core is not very fast (2GHz).
> >
> > Another reason I am not using  vtkVoxelContoursToSurfaceFilter is that it
> > requires contours with integer vertices while dicom RT contour points can be
> > off voxel centers.  I wonder what do you do to make sure you don't loss
> > resolution.
> >
> > Thanks!
> >
> > Xiaofeng
> >
> >
> >
> >> Date: Tue, 4 May 2010 17:50:37 +0200
> >> From: lars-friedrich at gmx.net
> >> Subject: Re: RE: [vtkusers] Fwd: Re: RE: Create an approximate
> >> cross-section of a RT ROI
> >> To: xf10036 at hotmail.com; vtkusers at vtk.org
> >>
> >> No, using a 'modern' PC is usually sufficient, all keeps flowing when a
> >> user interactively modifies the cut plane (although 3 planes are cut
> >> simultaneously and a 3D scene is updated as well). In our case we usually
> >> represent the 3D structures with transparency; as we update the 3D scene as
> >> well this makes the application sometimes a bit stuttering. But as I
> >> understand your plan you do not have to update any 3D scene during cutting.
> >> The cutting is really fast.
> >>
> >> lars
> >>
> >> -------- Original-Nachricht --------
> >> > Datum: Tue, 4 May 2010 11:12:05 -0400
> >> > Von: Xiaofeng Z <xf10036 at hotmail.com>
> >> > An: lars-friedrich at gmx.net, VTK <vtkusers at vtk.org>
> >> > Betreff: RE: [vtkusers] Fwd: Re: RE: Create an approximate cross-section
> >> > of a RT ROI
> >>
> >> >
> >> > Lars,
> >> >
> >> >
> >> >
> >> > Is there any noticable lagging at all?
> >> >
> >> >
> >> >
> >> > Thanks!
> >> > Xiaofeng
> >> >
> >> >
> >> >
> >> > > Date: Tue, 4 May 2010 16:34:24 +0200
> >> > > From: lars-friedrich at gmx.net
> >> > > To: vtkusers at vtk.org
> >> > > Subject: [vtkusers] Fwd: Re: RE: Create an approximate cross-section
> >> > > of
> >> > a RT ROI
> >> > >
> >> > >
> >> > > Xiaofeng,
> >> > >
> >> > > I use a quite comparable approach for the same purpose as you, I
> >> > > guess:
> >> > I cut multiple (!) 3D RT structures in 3 orthogonal planes
> >> > simultaneously
> >> > and cut the referenced RT volume (CT) at the same time. The structures
> >> > include quite complex anatomy such as the skeletons with many vertices.
> >> > > In my implementation (and that is nothing more than I wrote in the
> >> > morning) this works 'very' interactively. For me that is real-time
> >> > enough ;)
> >> > >
> >> > > regards,
> >> > >
> >> > > lars
> >> > >
> >> > >
> >> > > -------- Original-Nachricht --------
> >> > > > Datum: Tue, 4 May 2010 09:37:22 -0400
> >> > > > Von: Xiaofeng Z <xf10036 at hotmail.com>
> >> > > > An: lars-friedrich at gmx.net
> >> > > > Betreff: RE: [vtkusers] Create an approximate cross-section of a RT
> >> > ROI
> >> > >
> >> > > >
> >> > > > lars,
> >> > > >
> >> > > >
> >> > > >
> >> > > > I consider the method you described a more accurate way to do it.
> >> > > > Unfortunately, vtkCutter is too slow to be used in real time.
> >> > > >
> >> > > >
> >> > > >
> >> > > > Thanks for your reply though!
> >> > > >
> >> > > > Xiaofeng
> >> > > >
> >> > > >
> >> > > >
> >> > > > > Date: Tue, 4 May 2010 07:55:33 +0200
> >> > > > > From: lars-friedrich at gmx.net
> >> > > > > Subject: Re: [vtkusers] Create an approximate cross-section of a
> >> > > > > RT
> >> > ROI
> >> > > > > To: xf10036 at hotmail.com; vtkusers at vtk.org
> >> > > > >
> >> > > > > Hi Xiaofeng,
> >> > > > >
> >> > > > > just an idea:
> >> > > > > - produce a surface from the axial contours by using
> >> > > > vtkVoxelContoursToSurfaceFilter (which works quite well provided
> >> > > > your
> >> > source contours are
> >> > > > evenly distributed)
> >> > > > > - take vtkCutter(s) with plane implicit functions that define your
> >> > new
> >> > > > contouring orientation(s) and cut the volume to produce new contours
> >> > from
> >> > > > that directions
> >> > > > >
> >> > > > > HTH,
> >> > > > > lars
> >> > > > >
> >> > > > >
> >> > > > > -------- Original-Nachricht --------
> >> > > > > > Datum: Mon, 3 May 2010 20:12:22 -0400
> >> > > > > > Von: Xiaofeng Z <xf10036 at hotmail.com>
> >> > > > > > An: VTK <vtkusers at vtk.org>
> >> > > > > > Betreff: [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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