[vtkusers] Dose Volume Histogram

[Jothy]

If you use a fine resolution for the structure matrix, it should not affect your dvh accuracy too much,whether you include the surface points or not. 2 or 3 mm should be fine enough.

Take a look at the documentation of the point in polygon method you use.

Jothy

On 14-Oct-2010, at 7:09 PM, Xiaofeng Z <xf10036 at hotmail.com> wrote:

> I mean voxels that's partly inside and partly outside of the polygon.
> 
> Xiaofeng Z
> 
> 
>  
> CC: karthik.krishnan at kitware.com; vtkusers at vtk.org
> From: jothybasu at gmail.com
> Subject: Re: [vtkusers] Dose Volume Histogram
> Date: Thu, 14 Oct 2010 18:27:23 +0100
> To: xf10036 at hotmail.com
> 
> What do you mean by partial volume?
> 
> Jothy
> 
> On 14-Oct-2010, at 5:48 PM, Xiaofeng Z <xf10036 at hotmail.com> wrote:
> 
> Do you take into account of partial volume?  The dose grid is typically very coarse, I don't think the partial volume can be ignored.
> 
> Xiaofeng Z
> 
> 
>  
> CC: karthik.krishnan at kitware.com; vtkusers at vtk.org
> From: jothybasu at gmail.com
> Subject: Re: [vtkusers] Dose Volume Histogram
> Date: Thu, 14 Oct 2010 17:23:47 +0100
> To: xf10036 at hotmail.com
> 
> If you are speaking from the radiotherapy point of view,it should be done in a different way from what krishnan told. You should first use point-in-polygon method(which is available in vtkPolygon class) to find the voxels inside the structure and using the voxel indices, you could get their respective dose values and use a binning/histogram to bin the dose values to get the dvh along with their volumes.
> 
> Jothy
> 
> On 14-Oct-2010, at 5:03 PM, Xiaofeng Z <xf10036 at hotmail.com> wrote:
> 
> Hi Karthik,  Thanks for your answer.  The problem is that I also have a contour and only the volume (area) inside the contour should be included the histogram.
> 
> Xiaofeng Z
> 
> 
>  
> Date: Thu, 14 Oct 2010 20:14:13 +0530
> Subject: Re: [vtkusers] Dose Volume Histogram
> From: karthik.krishnan at kitware.com
> To: xf10036 at hotmail.com
> CC: vtkusers at vtk.org
> 
> No there isn't, but it should be relatively straightforward. On your dose image,  run vtkContourFilter with isovalues, that evenly split your scalar range into the desired number of bins. Then use vtkMassProperties to compute the area within each dose isocontour and use the charting capability to plot.
> 
> On Thu, Oct 14, 2010 at 7:52 PM, Xiaofeng Z <xf10036 at hotmail.com> wrote:
> Hello VTK users,
>  
> Is there a function to generate Dose Volume Histogram?
>  
> A Dose Volume Histogram is, in essence, a histogram of the area vs. intensity within an arbitrary contour i.e. the contour points are not always at pixel center.
>  
> Thanks!
> 
> Xiaofeng Z
> 
> 
> 
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