<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=us-ascii"> <style type="text/css" style="display:none"></style> </head> <body> <div style="font-size:12pt;color:#000000;background-color:#FFFFFF;font-family:Calibri,Arial,Helvetica,sans-serif;"> <p>Dear GATE users,</p> <p><br> </p> <p>I'm trying to run some simulation of a PET scanner that has two different kinds of crystal and corresponding electronics. Using the multi-system feature in GATE v6.2 I could define two-system PET scanner. Following is my setup:<br> </p> <p><br> </p> <div>#<span class="Apple-tab-span" style="white-space: pre;"> </span>First Scanner (cylindricalPET)<br> </div> <div>/gate/world/daughters/name Scanner_1<br> </div> <div>/gate/world/daughters/systemType cylindricalPET</div> <div>........................<br> </div> <div style="font-family: calibri, arial, helvetica, sans-serif; font-size: 16px;"> #<span class="Apple-tab-span" style="white-space: pre;"> </span>Second Scanner (cylindricalPET)<br> </div> <div style="font-family: calibri, arial, helvetica, sans-serif; font-size: 16px;"> /gate/world/daughters/name Scanner_2<br> </div> <div style="font-family: calibri, arial, helvetica, sans-serif; font-size: 16px;"> /gate/world/daughters/systemType cylindricalPET</div> <p>.........................<br> </p> <p><br> </p> <p><br> </p> <p>The system, and its modules are successfully attached.<br> </p> <p>Then for the Digitizer part, I have 2 digitizer:<br> </p> <div><br> </div> <div><br> </div> <div># For Scanner_1, using default singles chain "Singles"<br> </div> <div>/gate/digitizer/Singles/insert systemFilter<br> </div> <div>/gate/digitizer/Singles/systemFilter/selectSystem Scanner_1<br> </div> <div>....................<br> </div> <div># For Scanner_2, adding another singles chain "Singles_2"<br> <div>/gate/digitizer/name Singles_2<br> </div> <div>/gate/digitizer/insert singleChain<br> </div> <div>/gate/digitizer/Singles_2/insert systemFilter<br> </div> <div>/gate/digitizer/Singles_2/systemFilter/selectSystem Scanner_2<br> </div> <div>..................<br> </div> <br> </div> <p><br> </p> <p>Then these two singles chain go to 2 coincidence sorter:<br> </p> <p><br> </p> <p><br> </p> <p></p> <div># Using default "Coincidences" for default single chain "Singles"<br> </div> <div>/gate/digitizer/Coincidences/setInputName Singles<br> </div> <p>..................<br> </p> <div># Adding another coincidence sorter "<span style="font-family: calibri, arial, helvetica, sans-serif; font-size: 16px; background-color: #ffffff;">Coincidences_2</span>" using singles input "<span style="font-family: calibri, arial, helvetica, sans-serif; font-size: 16px; background-color: #ffffff;">Singles_2</span>"<br> </div> <div>/gate/digitizer/name Coincidences_2<br> </div> <div>/gate/digitizer/insert coincidenceSorter <br> </div> <div>/gate/digitizer/Coincidences_2/setInputName Singles_2<br> </div> <p><br> </p> <p>After simulation(ASCII output), I got 2 singles file and 2 coincidence file. Here comes my problems:<br> </p> <div> <p><br> </p> <p>Question 1.<br> </p> <p>According to the user guide, Data output part, <a href="http://wiki.opengatecollaboration.org/index.php/Users_Guide_V6.2:Data_output">http://wiki.opengatecollaboration.org/index.php/Users_Guide_V6.2:Data_output</a><br> </p> <p>In the singles.dat file, column 7-12 should be the ID of the volumes of detection, in which column 7 is "ID of volume attached to the "base" level of the system". In this multi-system PET, I expect to see this value be different(say 0 and 1) in the two singles.dat file (corresponding to Scanner_1 and Scanner_2). But actually in both files, this value is 0, which means I could not tell from an entry that which system this single comes from. Is this normal? If so, what does "the <span style="font-family: calibri, arial, helvetica, sans-serif; font-size: 16px; background-color: #ffffff;">"</span><span style="font-family: calibri, arial, helvetica, sans-serif; font-size: 16px; background-color: #ffffff;">base" level of the system</span><span style="font-family: calibri, arial, helvetica, sans-serif; font-size: 16px; background-color: #ffffff;">" mean?</span><br> </p> <p><span style="font-family: calibri, arial, helvetica, sans-serif; font-size: 16px; background-color: #ffffff;"><br> </span></p> <p><span style="font-family: calibri, arial, helvetica, sans-serif; font-size: 16px; background-color: #ffffff;">Question 2.</span></p> <p>In GATE 6.2, is there any ways to find the coincidence across different systems? For example, I would like to have coincidence between Scanner_1 and Sanner_2, or let the coincidence processor not only find coincidence within single chain "Singles" and "Singles_2" but also coincidences that has one event in "Singles" and the other event in "Singles_2"<br> </p> <p>I noticed there is a chapter on using the TriCoincidence processor to find coincidence between a coincidence pulse and a singles list. But this is not what I want. This is finding coincidence between a coincidence pulse and a singles list. I need to find coincidence between two singles list.<br> </p> <p><br> </p> <p>Thanks.<br> </p> <p><br> </p> <p><br> </p> <div style="font-family: tahoma; font-size: 13px;">Ke Li <div>PhD student</div> <div>Department of Electrical and System Engineering</div> <div>Washington University in St. Louis</div> </div> </div> </div> </body> </html>