<div dir="ltr"><div>Hi,</div><div>1. There is also the possibility to simulate refraction, see <a href="http://wiki.opengatecollaboration.org/index.php/Users_Guide:Setting_up_the_physics#X-ray_at_boundary">this wiki section</a>. But this will not simulate interference fringes as the phase-contrast actor. This is the only possibility as far as I know.</div><div>2. No, some actors can use non-voxelized geometry. But this actor is only working on a voxelized image.</div><div>3. Not that I'm aware of but that would be a useful tool! With RTK, you can draw some simple shapes, see e.g. <a href="http://wiki.openrtk.org/index.php/RTK/Scripts/DrawGeometricPhantom">this page</a>.<br></div><div>Simon<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, May 29, 2019 at 2:38 AM Jianbing <<a href="mailto:dongjbstrong@163.com">dongjbstrong@163.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div style="line-height:1.7;color:rgb(0,0,0);font-size:18px;font-family:simhei"><div style="line-height:1.7;color:rgb(0,0,0);font-size:18px;font-family:simhei"><div><span style="font-family:"Times New Roman"">Dear Gaters:</span></div><div><span style="font-family:"Times New Roman""> I want to use Gate to simulate the X-ray phase contrast imaging in CT scanning, which is based on the Fresnel diffraction law.</span></div><div><span style="font-family:"Times New Roman""> After building up the phantom geometry, the grating geometry (optical elements for phase contrast imaging), the FixedForcedDetectorActor was used to save the output from this simulation. But I encountered an error: "you need one voxelized volume in your scene".</span></div><div><span style="font-family:"Times New Roman""> So here are some questions:</span></div><div><span style="font-family:"Times New Roman""> 1. I was wandering that is the Actor the only way to simulate phase-contrast imaging in Gate? Is it possible the simulation of phase-contrast imaging without any Actors? Or how can I use Gate to simulate phase-contrast imaging without Actors?</span></div><div><span style="font-family:"Times New Roman""> 2. Does Actors must use voxelized phantom, like real patient data imported from some pictures? </span></div><div><span style="font-family:"Times New Roman""> 3. Is there any way I can save my analytic phantom geometry into voxelized file, so it can be imported as voxelized phantom to use Actors for phase-contrast imaging?</span></div><div><span style="font-family:"Times New Roman""><br></span></div><div><span style="font-family:"Times New Roman""> Here is information about my operating configuration:</span></div><div><span style="font-family:"Times New Roman""> VMware ubuntu 16.04</span></div><div><span style="font-family:"Times New Roman""> Geant4 10.4.3</span></div><div><span style="font-family:"Times New Roman""> RTK 1.4.0</span></div><div><span style="font-family:"Times New Roman""> ITK 4.13.0</span></div><div><span style="font-family:"Times New Roman""> XrayLib</span></div><div><span style="font-family:"Times New Roman""> Gate 8.1-patch 1</span></div><div><span style="font-family:"Times New Roman""><br></span></div><div><span style="font-family:"Times New Roman"">Thanks in advance!</span></div><div><span style="font-family:"Times New Roman""><br></span></div></div></div>_______________________________________________<br>
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