
<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Cory, <div class=""><br class=""></div><div class="">Yes, that is an assumption we’re going with (but it is a 3D kernel function). I’ll take a look at vtkFastSplatter then.</div><div class=""><br class=""></div><div class="">Cheers,</div><div class="">Richard</div><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On 15 Oct 2015, at 17:52, Cory Quammen <<a href="mailto:cory.quammen@kitware.com" class="">cory.quammen@kitware.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class=""><div class="">Richard,</div><div class=""><br class=""></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 class=""><br class=""></div><div class="">Cory</div></div><div class="gmail_extra"><br class=""><div class="gmail_quote">On Thu, Oct 15, 2015 at 11:46 AM, Richard Brown <span dir="ltr" class=""><<a href="mailto:richard.j.brown@live.co.uk" target="_blank" class="">richard.j.brown@live.co.uk</a>></span> wrote:<br class=""><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word" class="">Cory,<div class=""><br class=""></div><div class="">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" class="">http://www.jacmp.org/index.php/jacmp/article/viewFile/4371/3082/46375</a>).</div><div class=""><br class=""></div><div class="">Thanks,</div><div class="">Richard</div><div class=""><div class="h5"><div class=""><br class=""><div class=""><blockquote type="cite" class=""><div class="">On 15 Oct 2015, at 15:14, Cory Quammen <<a href="mailto:cory.quammen@kitware.com" target="_blank" class="">cory.quammen@kitware.com</a>> wrote:</div><br class=""><div class=""><div dir="ltr" class=""><div class="">Richard,</div><div class=""><br class=""></div>If your kernel is spatially invariant, you may want to look into vtkFastSplatter [1].<div class=""><br class=""></div><div class="">Thanks,</div><div class="">Cory</div><div class=""><br class=""></div><div class="">[1] <a href="http://www.vtk.org/doc/nightly/html/classvtkFastSplatter.html#a921b3de4b2b70437aa7273342fedfb74" target="_blank" class="">http://www.vtk.org/doc/nightly/html/classvtkFastSplatter.html#a921b3de4b2b70437aa7273342fedfb74</a></div></div><div class="gmail_extra"><br class=""><div class="gmail_quote">On Thu, Oct 15, 2015 at 8:23 AM, mbcx9rb9 <span dir="ltr" class=""><<a href="mailto:richard.j.brown@live.co.uk" target="_blank" class="">richard.j.brown@live.co.uk</a>></span> wrote:<br class=""><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi all,<br class="">

<br class="">

Im working on internal radiotherapy and, currently, I calculate my absorbed<br class="">

dose information (DVH etc.) by adding a kernel (vtkImageData) at each<br class="">

treatment point to a large dose grid (vtkImageData) that covers the whole<br class="">

treatment region. Then I pass by vtkImageAccumulate to do the dosimetry.<br class="">

<br class="">

Is this the best way to do it? Because if the majority receives no absorbed<br class="">

dose, it seems wasteful (in terms of memory) to have those voxels at the<br class="">

same resolution as in my kernel, where I have a very steep gradient of<br class="">

absorbed dose.<br class="">

<br class="">

Are there any other approaches? Would it, for example, be possible to store<br class="">

my kernel as a vtkUnstructuredGrid and still pass it by vtkImageAccumulate<br class="">

and get the same results?<br class="">

<br class="">

Thanks for any responses in advance.<br class="">

<br class="">

<br class="">

<br class="">

--<br class="">

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</blockquote></div><br class=""><br clear="all" class=""><div class=""><br class=""></div>-- <br class=""><div class="">Cory Quammen<br class="">R&D Engineer<br class="">Kitware, Inc.</div>

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</div></blockquote></div><br class=""></div></div></div></div></blockquote></div><br class=""><br clear="all" class=""><div class=""><br class=""></div>-- <br class=""><div class="gmail_signature">Cory Quammen<br class="">R&D Engineer<br class="">Kitware, Inc.</div>

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