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

Tue May 4 12:54:36 EDT 2010

I cut with vtkCutter,but the first step is to read RT structure data
as vtkPolyData. How would you do that?

I found one example in gdcm, but its in c++ and it was very comples
for me who use python,to understand.

An example of reading RT structure should be nice one for vtk wiki!

Thanks,

Jothy

On Tue, May 4, 2010 at 5:44 PM, Xiaofeng Z <xf10036 at hotmail.com> wrote:
> 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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