<div dir="ltr"><div><div><font size="2">Dear CASToR users,<br><br></font></div><font size="2">I'm trying to build an PET simulation using the GATE ecat system. The Geometry macro "Geometry.mac" is attached for reference. <br><br>I first simulated two 2.5mm-radius sphere sources in a phantom.From raw sinogram, I think I can see the two sphere sources. Root datafile and raw sinogram could be downloaded through the following link.<br><a href="https://drive.google.com/open?id=0B0vKwnYlHgr1LWpiclpnTUFZbUE">https://drive.google.com/open?id=0B0vKwnYlHgr1LWpiclpnTUFZbUE</a><br><br>I converted the GATE geometry to the .geom file ("GATE_PET.geom" as attached) and then converted root datafile to CASToR datafile with -t option. ("aq4.log", "aq4_CstrProj.Cdh" and "aq4_CstrProj.Cdf" as attached)<br><br></font></div><div><font size="2">Q1: It seems that the -t option only converts true unscattered events. Is it able to convert true unscattered and scattered events (no random)?<br><br></font></div><div><font size="2">Q2: In aq4_CstrProj.Cdh, the maximum ring difference is -1. Since the simulated PET has 52 detector rings, I think the maximum ring difference should be 51. I would like to know why is it -1?<br><br></font></div><div><font size="2">Then I use the following command to perform the reconstruction.<br></font>
<p style="margin-bottom:0in;line-height:100%"><font size="2">castor-recon -df
aq4_CstrProj.Cdh -dout recon_aq4 -it 3:8 -dim 400,400,109 -fov
780,780,218</font></p><font size="2"><br></font></div><div><font size="2">Q3: The reconstructed images are not right. Is there any idea how I can solve it?<br><a href="https://drive.google.com/open?id=0B0vKwnYlHgr1V3F2Q2JTLTlyc00">https://drive.google.com/open?id=0B0vKwnYlHgr1V3F2Q2JTLTlyc00</a><br><br></font></div><div><font size="2">Thank you very much and I'm looking forward to hearing from you.<br><br></font></div><div><font size="2">Your sincerely,<br></font></div><div><font size="2">Ying-Yu Chen</font><br></div><div><br><br></div></div>