<html> <head> <style></style></head> <body class='hmmessage'><div dir='ltr'>Hi Lorena,<div><br></div><div>I had similar issues when using the annulus-volume source. Gate (or Geant) can not process the commands related to the definition of the annulus source and it puts a point source instead. If you really want to simulate an annulus source (although I don't think it's needed for NEMA sensitivity measurements), you can solve it by using a cylinder source and a cold volume inside.<br><br>Best,<br><div style="line-height:17.0400009155273px;background-color:rgb(255, 255, 255);"><font face="Calibri" size="3">Ester D'Hoe</font></div><div style="line-height:17.0400009155273px;background-color:rgb(255, 255, 255);"><font face="Calibri" size="3"><br></font></div><div style="line-height:17.0400009155273px;background-color:rgb(255, 255, 255);"><font face="Calibri" size="3">Doctoral researcher</font></div><div style="line-height:17.0400009155273px;background-color:rgb(255, 255, 255);"><font face="Calibri" size="3">Ghent University - iMinds Medical IT</font></div><div style="line-height:17.0400009155273px;background-color:rgb(255, 255, 255);"><font face="Calibri" size="3">Medical Image and Signal Processing group</font></div><div style="line-height:17.0400009155273px;background-color:rgb(255, 255, 255);"><font face="Calibri" size="3">IBiTech - Campus Heymans - Block B</font></div><div style="line-height:17.0400009155273px;background-color:rgb(255, 255, 255);"><font face="Calibri" size="3">De Pintelaan 185</font></div><div style="line-height:17.0400009155273px;background-color:rgb(255, 255, 255);"><font face="Calibri" size="3">B-9000 Gent</font></div><div style="line-height:17.0400009155273px;background-color:rgb(255, 255, 255);"><font face="Calibri" size="3">Belgium</font></div><div style="line-height:17.0400009155273px;background-color:rgb(255, 255, 255);"><font face="Calibri" size="3"><br style="line-height:17.0400009155273px;"></font></div><div style="line-height:17.0400009155273px;background-color:rgb(255, 255, 255);"><font face="Calibri" size="3">Tel: +32 9 332 43 22</font></div><div style="line-height:17.0400009155273px;background-color:rgb(255, 255, 255);"><font face="Calibri" size="3">mail: ester.dhoe@ugent.be</font></div><br><br><div><hr id="stopSpelling">From: lorena.vazquez@usal.es<br>Date: Mon, 2 Mar 2015 19:40:16 +0100<br>To: gate-users@lists.opengatecollaboration.org<br>Subject: [Gate-users] DISTRIBUTION_SOURCE_PET<br><br><div dir="ltr"><div class="ecxgmail_default" style="font-family:comic sans ms,sans-serif;font-size:small;"><br>Dear Gaters,<br>I have a problem.<br>I want to simulate the sensitivity of the PET. I am using the NEMA NU 2-2007.<br>I use a source F-18 inside five cylinders. Therefore, I have it, the following: <br>--------<br>PHANTOM:<br>--------<br><br># CYLINDER 5<br>/gate/world/daughters/name phantom5<br>/gate/world/daughters/insert cylinder<br>/gate/phantom5/setMaterial Air<br>/gate/phantom5/vis/setColor grey<br>/gate/phantom5/geometry/setRmax 0.955 cm<br>/gate/phantom5/geometry/setRmin 0.83 cm<br>/gate/phantom5/geometry/setHeight 70 cm<br>/gate/phantom5/placement/setTranslation 0 0 0 mm<br><br>/gate/phantom5/attachPhantomSD<br><br># CYLINDER 4<br>/gate/phantom5/daughters/name phantom4<br>/gate/phantom5/daughters/insert cylinder<br>/gate/phantom4/setMaterial Air<br>/gate/phantom4/vis/setColor blue<br>/gate/phantom4/geometry/setRmax 0.795 cm<br>/gate/phantom4/geometry/setRmin 0.67 cm<br>/gate/phantom4/geometry/setHeight 70 cm<br>/gate/phantom4/placement/setTranslation 0 0 0 mm<br><br>/gate/phantom4/attachPhantomSD<br><br># CYLINDER 3<br>/gate/phantom4/daughters/name phantom3<br>/gate/phantom4/daughters/insert cylinder<br>/gate/phantom3/setMaterial Air<br>/gate/phantom3/vis/setColor yellow<br>/gate/phantom3/geometry/setRmax 0.635 cm<br>/gate/phantom3/geometry/setRmin 0.51 cm<br>/gate/phantom3/geometry/setHeight 70 cm<br>/gate/phantom3/placement/setTranslation 0 0 0 mm<br><br>/gate/phantom3/attachPhantomSD<br><br># CYLINDER 2<br>/gate/phantom3/daughters/name phantom2<br>/gate/phantom3/daughters/insert cylinder<br>/gate/phantom2/setMaterial Air<br>/gate/phantom2/vis/setColor green<br>/gate/phantom2/geometry/setRmax 0.475 cm<br>/gate/phantom2/geometry/setRmin 0.35 cm<br>/gate/phantom2/geometry/setHeight 70 cm<br>/gate/phantom2/placement/setTranslation 0 0 0 mm<br><br>/gate/phantom2/attachPhantomSD<br><br># CYLINDER 1<br>/gate/phantom2/daughters/name phantom1<br>/gate/phantom2/daughters/insert cylinder<br>/gate/phantom1/setMaterial Air<br>/gate/phantom1/vis/setColor red<br>/gate/phantom1/geometry/setRmax 0.32 cm<br>/gate/phantom1/geometry/setRmin 0.195 cm<br>/gate/phantom1/geometry/setHeight 70 cm<br>/gate/phantom1/placement/setTranslation 0 0 0 mm<br><br>/gate/phantom1/attachPhantomSD<br><br>--------<br>SOURCE:<br>--------<br>/gate/source/addSource F18CylinderSource<br>/gate/source/F18CylinderSource/setActivity 50. becquerel<br>/gate/source/F18CylinderSource/gps/particle e+<br>/gate/source/F18CylinderSource/setForcedUnstableFlag true<br>/gate/source/F18CylinderSource/setForcedHalfLife 6586 s<br>/gate/source/F18CylinderSource/gps/energytype Fluor18<br>/gate/source/F18CylinderSource/gps/shape Annulus<br>/gate/source/F18CylinderSource/gps/type Volume<br>/gate/source/F18CylinderSource/gps/radius0 0.1 cm<br>/gate/source/F18CylinderSource/gps/radius 0.3 cm<br>/gate/source/F18CylinderSource/gps/halfz 35 cm<br><br>/gate/source/F18CylinderSource/gps/angtype iso<br>/gate/source/F18CylinderSource/gps/mintheta 0. deg<br>/gate/source/F18CylinderSource/gps/maxtheta 180. deg<br>/gate/source/F18CylinderSource/gps/minphi 0. deg<br>/gate/source/F18CylinderSource/gps/maxphi 360. deg<br>/gate/source/F18CylinderSource/gps/centre 0. 0. 0. cm<br>/gate/source/list<br><br><br>According to the photo, emissions occur only in the center of the source. But i think that events should be seen throughout the source continuously and uniformly. Can you do it?<br clear="all"></div><br>-- <br><div class="ecxgmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><pre>LORENA VÁZQUEZ CANELAS<br>-- <br>LRI - Datación (Despacho Técnicos)<br>Calle Espejo, s/n, 37008 - Salamanca (Spain)<br>TEL: +34 923 294930 ext:4932 email: <a href="mailto:lorena.vazquez@usal.es" target="_blank">lorena.vazquez@usal.es</a><br>web: <a href="http://campus.usal.es/~lri/" target="_blank">http://campus.usal.es/~lri/</a></pre></div></div></div></div></div></div></div></div></div></div> </div> <br>_______________________________________________ Gate-users mailing list Gate-users@lists.opengatecollaboration.org http://lists.opengatecollaboration.org/mailman/listinfo/gate-users</div></div> </div></body> </html>