<HTML dir=ltr><HEAD><TITLE>[Gate-users] isotropic emission from a rod source ?</TITLE> <META http-equiv=Content-Type content="text/html; charset=unicode"> <META content="MSHTML 6.00.6000.16544" name=GENERATOR></HEAD> <BODY> <DIV id=idOWAReplyText65048 dir=ltr> <DIV dir=ltr>How did you get those two plots?</DIV> <DIV dir=ltr>Using Singles or Coincidences?</DIV> <DIV dir=ltr> </DIV> <DIV dir=ltr>It seems that photons you recorded are even not isotropical (peak in y=0) in transverse plane.</DIV> <DIV dir=ltr>I do not understand what are those scattered points around central points in your left plot.</DIV> <DIV dir=ltr> </DIV> <DIV dir=ltr>You better put your PET geometry and coincidence module macro too.</DIV> <DIV dir=ltr> </DIV> <DIV dir=ltr>And please plot your sourcePosX,Y,Z in Singles.</DIV> <DIV dir=ltr>   </DIV> <DIV dir=ltr> </DIV></DIV> <DIV id=idSignature96355 dir=ltr><PRE>Yu Chen, Ph.D. University of Massachusetts Medical School Division of Nuclear Medicine 55 Lake Avenue North Worcester, MA 01655-0243 Phone: (508) 856-6123 Fax: (508) 856-4572</PRE></DIV> <DIV dir=ltr> <HR tabIndex=-1> From: gate-users-bounces@lists.healthgrid.org on behalf of Joon Young Suk Sent: Mon 12/10/2007 6:55 PM To: gate-users@lists.healthgrid.org Subject: [Gate-users] isotropic emission from a rod source ? </DIV> <DIV> I built two rod sources which set as isotropic sources, but  simulation result show most data have been acquired from the  horizontal plane. Please check my result in the following link : <A href="http://www.joonyoung.net/root_result_2007-12-10.jpg">http://www.joonyoung.net/root_result_2007-12-10.jpg</A> Could you please find out what is my problem. Here is a part of my macro ; ##### PHANTOM GEOMETRY ############## ## Cylindrical phantom has two rod sources #### # H E A D /gate/world/daughters/name phantomHead /gate/world/daughters/insert cylinder /gate/phantomHead/placement/setTranslation {phXposition} 0. 0. mm /gate/phantomHead/setMaterial Air /gate/phantomHead/geometry/setRmax 22.5 mm /gate/phantomHead/geometry/setHeight 50. mm /gate/phantomHead/vis/forceWireframe /gate/phantomHead/vis/setColor blue /gate/geometry/update # Add Rods for source confinement # ROD0 : rod at right-side (positive x-axis) # Diameter : 1.0 mm /gate/phantomHead/daughters/name rod0 /gate/phantomHead/daughters/insert cylinder /gate/rod0/geometry/setRmax 0.5 mm /gate/rod0/geometry/setRmin 0.0 mm /gate/rod0/geometry/setHeight 50. mm /gate/rod0/placement/setTranslation {rod0Xposition} 0. 0. mm /gate/rod0/setMaterial Water /gate/rod0/vis/setColor red # ROD1 : rod at left-side(negative x-axis) /gate/phantomHead/daughters/name rod1 /gate/phantomHead/daughters/insert cylinder /gate/rod1/geometry/setRmax 0.5 mm /gate/rod1/geometry/setRmin 0.0 mm /gate/rod1/geometry/setHeight 50. mm /gate/rod1/placement/setTranslation {rod1Xposition} 0. 0. mm /gate/rod1/setMaterial Water /gate/rod1/vis/setColor red # PHANTOM defined as SENSITIVE /gate/phantomHead/attachPhantomSD ################################################################### # S O U R C E S #### two rod sources ## rodsource0 -> confines to rod0 in the phantom ## rodsource1 -> confiines  to rod1 in the phantom ################################################################### /gate/source/addSource rodsource0 /gate/source/rodsource0/setActivity {activity} becquerel /gate/source/rodsource0/setType backtoback /gate/source/rodsource0/gps/particle gamma /gate/source/rodsource0/gps/energytype Mono /gate/source/rodsource0/gps/monoenergy 0.511 MeV /gate/source/rodsource0/gps/type Volume /gate/source/rodsource0/gps/shape Cylinder /gate/source/rodsource0/gps/centre {r0sourceXposition} 0. 0. mm /gate/source/rodsource0/gps/radius 0.5 mm /gate/source/rodsource0/gps/halfz 25. mm /gate/source/rodsource0/gps/angtype iso /gate/source/rodsource0/gps/confine rod0_P /gate/source/addSource rodsource1 /gate/source/rodsource1/setActivity {activity} becquerel /gate/source/rodsource1/setType backtoback /gate/source/rodsource1/gps/particle gamma /gate/source/rodsource1/gps/energytype Mono /gate/source/rodsource1/gps/monoenergy 0.511 MeV /gate/source/rodsource1/gps/type Volume /gate/source/rodsource1/gps/shape Cylinder /gate/source/rodsource1/gps/centre {r1sourceXposition} 0. 0. mm /gate/source/rodsource1/gps/radius 0.5 mm /gate/source/rodsource1/gps/halfz 25. mm /gate/source/todsource1/gps/angtype iso /gate/source/rodsource1/gps/confine rod1_P ### ROOT #### /gate/output/root/setSaveRndmFlag 0 /gate/output/root/setFileName {outFile} /gate/output/root/setRootHitFlag 0 /gate/output/root/setRootSinglesFlag 1 /gate/output/root/setRootCoincidencesFlag 1 /gate/output/root/setRootNtupleFlag 0 # D A T A  A C Q U I S I T I O N /gate/application/setTimeSlice {timeSlice} s /gate/application/setTimeStart 0. s /gate/application/setTimeStop {timeStop} s ###### START DAQ ####### /gate/application/startDAQ Thank you _______________________________________________ Gate-users mailing list Gate-users@lists.healthgrid.org <A href="http://lists.healthgrid.org/mailman/listinfo/gate-users">http://lists.healthgrid.org/mailman/listinfo/gate-users</A> </DIV></BODY></HTML>