<div dir="ltr"><div>Richard,</div><div><br></div>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?<div><br></div><div>Cory</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Oct 15, 2015 at 11:46 AM, Richard Brown <span dir="ltr"><<a href="mailto:richard.j.brown@live.co.uk" target="_blank">richard.j.brown@live.co.uk</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word">Cory,<div><br></div><div>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: <a href="http://www.jacmp.org/index.php/jacmp/article/viewFile/4371/3082/46375" target="_blank">http://www.jacmp.org/index.php/jacmp/article/viewFile/4371/3082/46375</a>).</div><div><br></div><div>Thanks,</div><div>Richard</div><div><div class="h5"><div><br><div><blockquote type="cite"><div>On 15 Oct 2015, at 15:14, Cory Quammen <<a href="mailto:cory.quammen@kitware.com" target="_blank">cory.quammen@kitware.com</a>> wrote:</div><br><div><div dir="ltr"><div>Richard,</div><div><br></div>If your kernel is spatially invariant, you may want to look into vtkFastSplatter [1].<div><br></div><div>Thanks,</div><div>Cory</div><div><br></div><div>[1] <a href="http://www.vtk.org/doc/nightly/html/classvtkFastSplatter.html#a921b3de4b2b70437aa7273342fedfb74" target="_blank">http://www.vtk.org/doc/nightly/html/classvtkFastSplatter.html#a921b3de4b2b70437aa7273342fedfb74</a></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Oct 15, 2015 at 8:23 AM, mbcx9rb9 <span dir="ltr"><<a href="mailto:richard.j.brown@live.co.uk" target="_blank">richard.j.brown@live.co.uk</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi all,<br>
<br>
Im working on internal radiotherapy and, currently, I calculate my absorbed<br>
dose information (DVH etc.) by adding a kernel (vtkImageData) at each<br>
treatment point to a large dose grid (vtkImageData) that covers the whole<br>
treatment region. Then I pass by vtkImageAccumulate to do the dosimetry.<br>
<br>
Is this the best way to do it? Because if the majority receives no absorbed<br>
dose, it seems wasteful (in terms of memory) to have those voxels at the<br>
same resolution as in my kernel, where I have a very steep gradient of<br>
absorbed dose.<br>
<br>
Are there any other approaches? Would it, for example, be possible to store<br>
my kernel as a vtkUnstructuredGrid and still pass it by vtkImageAccumulate<br>
and get the same results?<br>
<br>
Thanks for any responses in advance.<br>
<br>
<br>
<br>
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</div></blockquote></div><br></div></div></div></div></blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature">Cory Quammen<br>R&D Engineer<br>Kitware, Inc.</div>
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