[vtkusers] internal radiotherapy kernel

[Richard Brown]

Cory, 

Still trying to get my head around vtkFastSplatter. Do you have any other examples other than the example in Imgaging->Core->Testing->Cxx->FastSplatter.cxx ?

Regards,
Richard

> On 16 Oct 2015, at 09:10, Richard Brown <richard.j.brown at live.co.uk> wrote:
> 
> Cory, 
> 
> Yes, that is an assumption we’re going with (but it is a 3D kernel function). I’ll take a look at vtkFastSplatter then.
> 
> Cheers,
> Richard
> 
>> On 15 Oct 2015, at 17:52, Cory Quammen <cory.quammen at kitware.com <mailto:cory.quammen at kitware.com>> wrote:
>> 
>> Richard,
>> 
>> By spatially invariant, I mean that the 2D kernel function that is accumulated in the dose grid is the same no matter where the treatment point is. Is that the case?
>> 
>> Cory
>> 
>> On Thu, Oct 15, 2015 at 11:46 AM, Richard Brown <richard.j.brown at live.co.uk <mailto:richard.j.brown at live.co.uk>> wrote:
>> Cory,
>> 
>> Thanks for the reply, but the kernel is not spatially invariant, it has a sharp peak in the centre (like the image in this link: http://www.jacmp.org/index.php/jacmp/article/viewFile/4371/3082/46375 <http://www.jacmp.org/index.php/jacmp/article/viewFile/4371/3082/46375>).
>> 
>> Thanks,
>> Richard
>> 
>>> On 15 Oct 2015, at 15:14, Cory Quammen <cory.quammen at kitware.com <mailto:cory.quammen at kitware.com>> wrote:
>>> 
>>> Richard,
>>> 
>>> If your kernel is spatially invariant, you may want to look into vtkFastSplatter [1].
>>> 
>>> Thanks,
>>> Cory
>>> 
>>> [1] http://www.vtk.org/doc/nightly/html/classvtkFastSplatter.html#a921b3de4b2b70437aa7273342fedfb74 <http://www.vtk.org/doc/nightly/html/classvtkFastSplatter.html#a921b3de4b2b70437aa7273342fedfb74>
>>> 
>>> On Thu, Oct 15, 2015 at 8:23 AM, mbcx9rb9 <richard.j.brown at live.co.uk <mailto:richard.j.brown at live.co.uk>> wrote:
>>> Hi all,
>>> 
>>> Im working on internal radiotherapy and, currently, I calculate my absorbed
>>> dose information (DVH etc.) by adding a kernel (vtkImageData) at each
>>> treatment point to a large dose grid (vtkImageData) that covers the whole
>>> treatment region. Then I pass by vtkImageAccumulate to do the dosimetry.
>>> 
>>> Is this the best way to do it? Because if the majority receives no absorbed
>>> dose, it seems wasteful (in terms of memory) to have those voxels at the
>>> same resolution as in my kernel, where I have a very steep gradient of
>>> absorbed dose.
>>> 
>>> Are there any other approaches? Would it, for example, be possible to store
>>> my kernel as a vtkUnstructuredGrid and still pass it by vtkImageAccumulate
>>> and get the same results?
>>> 
>>> Thanks for any responses in advance.
>>> 
>>> 
>>> 
>>> --
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>>> 
>>> 
>>> -- 
>>> Cory Quammen
>>> R&D Engineer
>>> Kitware, Inc.
>> 
>> 
>> 
>> 
>> -- 
>> Cory Quammen
>> R&D Engineer
>> Kitware, Inc.
> 
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