<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"> <head> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <meta name="Generator" content="Microsoft Word 15 (filtered medium)"> <style></style> </head> <body lang="DE-AT" link="#0563C1" vlink="#954F72"> <div class="WordSection1"> Hi Sam!<o:p></o:p> <o:p> </o:p> I am not an expert but I would recommend you few basic things:<o:p></o:p> <![if !supportLists]>- <![endif]>If you have an irregular shape do to not score the dose values directly but use rather the energy deposited and then post-process dose values. as far as I know, the dose actor dose not compute correctly the dose if you do not have a regular shape. Do you see the same behavior in your output-Edep.txt? <o:p></o:p> <![if !supportLists]>- <![endif]>Run the command geometry/test/run in order to see if you have any overlap in your geometry. If this is the case your results are unpredictable<o:p></o:p> <![if !supportLists]>- <![endif]>In some sense, an actor is like a virtual object that you must attached to a geometrical volume. In your specific case (wedge shape) I personally do not see other solutions than your “3bodies approach”. Therefore you should attach a different actor to each of your wedge-volume<o:p></o:p> <o:p> </o:p> Hope this can help!<o:p></o:p> <o:p> </o:p> Cheers<o:p></o:p> Alessio<o:p></o:p> <o:p> </o:p> <div> <div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm"> From: Gate-users [mailto:gate-users-bounces@lists.opengatecollaboration.org] On Behalf Of Manger, Sam Sent: Dienstag, 14. M�rz 2017 18:21 To: gate-users@lists.opengatecollaboration.org Subject: Re: [Gate-users] Attaching a dose actor to a wedge-shaped volume<o:p></o:p> </div> </div> <o:p> </o:p> <div id="divtagdefaultwrapper"> To add to this -<o:p></o:p> <o:p> </o:p> If I create a 2D/3D actor not attached to any volume, then I get a segmentation error. I feel like this is the right way of doing things but I'm not sure why I'm getting this error. There's no helpful debugging info that comes out if I switch verbosity on.<o:p></o:p> <o:p> </o:p> My dose actor definition in the macro is:<o:p></o:p> <o:p> </o:p> <div> /gate/actor/addActor DoseActor test /gate/actor/test/setPosition 12.5 0. 10. mm /gate/actor/test/setSize 35. 50. .028 mm /gate/actor/test/setResolution 140 200 1 /gate/actor/test/stepHitType random /gate/actor/test/enableEdep true /gate/actor/test/saveEveryNSeconds 60 /gate/actor/test/save /home/user/GATE_Simulations/wedge/test.txt Sam<o:p></o:p> </div> <o:p> </o:p> <o:p> </o:p> <div> <div class="MsoNormal" align="center" style="text-align:center"> <hr size="3" width="98%" align="center"> </div> <div id="divRplyFwdMsg"> From: Manger, Sam <<a href="mailto:S.Manger@warwick.ac.uk">S.Manger@warwick.ac.uk</a>> Sent: 14 March 2017 16:44 To: <a href="mailto:gate-users@lists.opengatecollaboration.org">gate-users@lists.opengatecollaboration.org</a> Subject: [Gate-users] Attaching a dose actor to a wedge-shaped volume <o:p></o:p> <div> <o:p></o:p> </div> </div> <div> <div id="divtagdefaultwrapper"> Hi Gate users,<o:p></o:p> <o:p> </o:p> I'm trying to simulate the response of Gafchromic film to protons. I've done this previously using a rectangular volume with the material properties of EBT-3 and essentially produce a 2D voxelised dose output. However, in experiment, I've used a piece of film that looks almost D-shaped. To replicate this in Gate, I have produced 3 volumes; central rectangular volume that is a box, flanked by two wedges. I've tilted them at 1 degree to the x-axis and I think I've aligned them. Now, I'm struggling to get a sensible output!<o:p></o:p> <o:p> </o:p> <img border="0" width="639" height="495" id="img554141" src="cid:image001.png@01D29D64.1A6D0B10" alt="cid:image001.png@01D29D64.1A6D0B10"><o:p></o:p> <o:p> </o:p> If I attach a dose actor to each volume, then I see dose being deposited in the film. The central region is fine, but the two wedge regions confuse me slightly. I've used /gate/actor/[actorname]/setResolution to define the resolution but I'm not sure how this works with the wedge-shapes. The whole dose matrix is full and there isn't any hint of structure. Should I expect that my dose volume is entirely contained within the film volume? This would mean that the voxels are different sizes.<o:p></o:p> <o:p> </o:p> Is there a better way of getting a dose actor to read out the film? I tried attatching an actor to the world volume and locating it at the same position as the active layer of the film but got no output!<o:p></o:p> <o:p> </o:p> Please let me know if I'm doing anything stupid!<o:p></o:p> <o:p> </o:p> Sam Manger<o:p></o:p> <o:p> </o:p> </div> </div> </div> </div> </div> <div class="WordSection1"> <o:p></o:p>Disclaimer: Please notice our E-Mail Disclaimer <a href="http://www.medaustron.at/email-disclaimer/">http://www.medaustron.at/email-disclaimer/</a><o:p></o:p><o:p> </o:p> </div> </body> </html>