<html xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns="http://www.w3.org/TR/REC-html40"> <head> <meta http-equiv=Content-Type content="text/html; charset=utf-8"> <meta name=Generator content="Microsoft Word 11 (filtered medium)"> <style>  </style> </head> <body lang=FR link=blue vlink=purple> <div class=Section1> Hi Arda,<o:p></o:p> <o:p> </o:p> According to your output, you have:<o:p></o:p> <o:p> </o:p> >> entering [GateToSinogram::RecordEndOfRun]<o:p></o:p> Number of prompt coincidences for all ring combinations 276<o:p></o:p> Number of true coincidences for all ring combinations 276<o:p></o:p> Number of scattered coincidences for all ring combinations 113<o:p></o:p> Number of random coincidences for all ring combinations 0<o:p></o:p> Number of delayed coincidences for all ring combinations 0<o:p></o:p> sinograms 1,1,1,0,0 written to the raw file yourSinogram_1.ima<o:p></o:p> sinograms 1,1,1,1,0 written to the raw file yourSinogram_1_del.ima<o:p></o:p> sinograms 1,1,1,4,0 written to the raw file yourSinogram_1_sct.ima<o:p></o:p> >> leaving [GateToSinogram::RecordEndOfRun]<o:p></o:p> <o:p> </o:p> You should then have 276 events in yourSinogram_1.ima; 113 events in <o:p></o:p> yourSinogram_1_sct.ima and 0 events in yourSinogram_1_del.ima. As a consequence, the majority of the sinogram bins are set to zero! According to your geometry:<o:p></o:p> <o:p> </o:p> Number of crystals per crystal rings: 576<o:p></o:p> Number of crystal rings: 32<o:p></o:p> Number of radial sinogram bins: 288<o:p></o:p> Number of azimuthal sinogram bins: 288<o:p></o:p> <o:p> </o:p> You have 288*288*32*32 = 84934656 bins per sinograms. At best, 3e-6 of them are non-zero. So, when you visualize your sinograms, it is very likely that you only see zeroes. <o:p></o:p> <o:p> </o:p> The difference between the sinograms is explained in your output!<o:p></o:p> <o:p> </o:p> Prompt coincidences are recorded in data = 0<o:p></o:p> Delayed coincidences (if simulated) are recorded in data = 1<o:p></o:p> True scattered coincidences (eventID1 = eventID2) are recorded in data = 4<o:p></o:p> <o:p> </o:p> sinograms 1,1,1,0,0 written to the raw file yourSinogram_1.ima<o:p></o:p> sinograms 1,1,1,1,0 written to the raw file yourSinogram_1_del.ima<o:p></o:p> sinograms 1,1,1,4,0 written to the raw file yourSinogram_1_sct.ima<o:p></o:p> <o:p> </o:p> So, yourSinogram_1.ima for prompts, yourSinogram_1_del.ima for delayeds, and yourSinogram_1_sct.ima for scatters.<o:p></o:p> <o:p> </o:p> Claude<o:p></o:p> <o:p> </o:p> -----Message d'origine----- De : gate-users-bounces@lists.healthgrid.org [mailto:gate-users-bounces@lists.healthgrid.org] De la part de arda Envoyé : mercredi 2 juillet 2008 23:13 À : Gate-users@lists.healthgrid.org Objet : [Gate-users] Sinogram Output<o:p></o:p> <o:p> </o:p> Hello,<o:p></o:p> I am a beginner in GATE. <o:p></o:p> (CLHEP 2.0.3.1 / Geant4 9.0 / root 5.14 / gate3.1.2)<o:p></o:p> <o:p> </o:p> I am trying to obtain sinogram data from "PET_Ecat_System.mac" example<o:p></o:p> and visualize them on IDL. I read the "yourSinogram_1.ima" and<o:p></o:p> "yourSinogram_1_del.ima" (both 162 Mb) data on IDL and the entire data<o:p></o:p> are zero.<o:p></o:p> Attached the log file and the macro I used<o:p></o:p> <o:p> </o:p> 1) Could you tell me what I am doing wrong ?<o:p></o:p> 2) Also, what are the differences between "yourSinogram_1.ima",<o:p></o:p> "yourSinogram_1_del.ima" and "yourSinogram_1.sct.ima" output data. Which<o:p></o:p> one I need to use on IDL to read the actuall sinogram?<o:p></o:p> <o:p> </o:p> Thanks,<o:p></o:p> Arda<o:p></o:p> <o:p> </o:p> <o:p></o:p> <o:p> </o:p> <o:p> </o:p> > <o:p></o:p> </div> </body> </html>