<div dir="ltr">Hi Christopher<div><br></div><div>Yes, I think you are right when you write "I believe the problem lies in my discretization of the dose actor". Did you play with the values of setVoxelSize?<br></div><div>What you have to see is the target sphere (R=1cm), 1mmx1mmx1mm is enough to see a sphere form with a sphere size like this. Just remenber that setSize is not necessary. Did you remove the <b>#</b> for Position, voxelSize and Resolution lines? otherwise they do not work.</div><div><br></div><div>Best regards</div><div>Maikol</div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr">El jue., 22 nov. 2018 a las 11:28, Christopher Watanabe (<<a href="mailto:chris.r.watanabe@gmail.com">chris.r.watanabe@gmail.com</a>>) escribió:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><div><div><div>Hi Maikol, <br><br></div>Thanks for the response. I'm a little confused by this though. Generally, no matter where I put the source, shouldn't I expect a spherical distribution around it? (At least the way I defined it, essentially being an isometric point source) <br><br></div>I believe the problem lies in my discretization of the dose actor. When one attaches the dose actor to the volume, does it automatically take the shape of the volume? I guess in the end, I'm just not sure how to define my dose actor appropriately, because the dose really shouldn't be cubically shaped, especially given that the target around the source is a spherical volume of water...<br><br></div>Best, <br><br></div>Chris<br></div><br><div class="gmail_quote"><div dir="ltr">On Tue, Nov 20, 2018 at 2:44 PM Maikol Salas Ramirez <<a href="mailto:mmsalas@gmail.com" target="_blank">mmsalas@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div dir="ltr">Hi Christopher<div><br></div><div>1- If you define a sphere in the 0,0,0 position the sphere has 1/4 of his volume in the each of the 4 voxel that are around 0,0,0 maybe this is with you see a cube. If you move the sphere to 0.5,0.5,0.5 mm, it will be in the center of the voxel 1,0,0, then you will see this voxel brighter than others around. This is tricky, am it is a normal error when the people used NM and CT in the simulation (NM needs a shift).</div><div><br></div><div>2- In the dose actor you need at least lo specify the Position, voxelSize and Resolution (setSize is not necessary). I guess, you are only testing, because put a sphere with a similar size to the voxel es a bit strange. Normally for a voxel kernel the people use a box with the same size to tha voxel.</div><div><br></div><div>Best regards</div><div>Maikol</div><div><br></div><div><br></div></div></div><br><div class="gmail_quote"><div dir="ltr">El mar., 20 nov. 2018 a las 14:11, Christopher Watanabe (<<a href="mailto:chris.r.watanabe@gmail.com" target="_blank">chris.r.watanabe@gmail.com</a>>) escribió:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>Hello fellow Gate Users, <br><br></div><div>I'm running simulations of a radioactive source placed within a volume of water. Below I show snippets of showing the volume of water made inside a world of air (3cm x 3cm x 3cm) and the dose actor. <br></div><div><div><img src="cid:ii_jopr6dzm1" alt="image.png" width="391" height="168"><br></div></div><div><div><img src="cid:ii_jopr5jlz0" alt="image.png" width="391" height="187"></div><div>I've played with the dose actor characteristics quite a bit, and I've found that no matter what I do, the .mhd dose file output consistently shows a Cube shaped dose distribution. This doesn't make sense to me, as I've defined a spherical source of radiation and attached the dose actor to the sphere of water...Can anyone suggest something that might be going wrong? My source I define below: <br></div><div><div><img src="cid:ii_jopr9vrv2" alt="image.png" width="391" height="357"><br></div></div><div>Thanks a lot in advnance! I think if there's no problem with my dose actor definition, then I must be doing something wrong with my source definition. <br></div><div><br></div><div>Best Regards, <br><br></div><div>Chris<br></div><div><br></div></div></div>
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