<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <style type="text/css" style="display:none;"></style> </head> <body dir="ltr"> <div id="divtagdefaultwrapper" style="font-size:12pt;color:#000000;font-family:Calibri,Arial,Helvetica,sans-serif;" dir="ltr"> Hi Gate users, 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! <img size="29450" contenttype="image/png" style="max-width: 99.9%; -moz-user-select: none;" id="img554141" aria-expanded="false" tabindex="0" src="cid:395d6c7b-a905-4732-be7a-a89cec651597"> 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. 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! Please let me know if I'm doing anything stupid! Sam Manger </div> </body> </html>