<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" 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 12 (filtered medium)">  <style>  </style>  </head> <body lang=ZH-CN link=blue vlink=purple> <div class=Section1> Hi Hongwei<o:p></o:p> I think there is no any problem in your macro file, if you set the source in the FOV, you will find the result is acceptable.<o:p></o:p> <o:p> </o:p> <o:p> </o:p> <o:p> </o:p> <div> Best wishes<o:p></o:p> ----------------------------------------------------------------------<o:p></o:p> Guocheng Wu<o:p></o:p> Software Department<o:p></o:p> Neusoft Positron Medical Systems Co.,Ltd.<o:p></o:p> No.2 Xin Xiu Street, Hun Nan New District, Shenyang 110179, PRC<o:p></o:p> Tel: (86 24) 836 61980<o:p></o:p> Fax: (86 24) 836 61796<o:p></o:p> Mobile: 13604039065<o:p></o:p> Email: <a href="mailto:wuguocheng@neusoft.com">wuguocheng@neusoft.com</a><o:p></o:p> Website: <a href="http://medical.neusoft.com">http://medical.neusoft.com</a><o:p></o:p> ----------------------------------------------------------------------<o:p></o:p> </div> <o:p> </o:p> <div> <div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'> 发件人: Hongwei Ye [mailto:howellye@yahoo.com] 发送时间: 2009年3月7日 4:11 收件人: WuGuocheng 抄送: gate-users@lists.healthgrid.org 主题: Re: Gate-users Digest, Vol 34, Issue 4<o:p></o:p> </div> </div> <o:p> </o:p> <div> Hi, Guocheng, Thank you very much for your response. I'm not sure if I made the same mistake as you. I have changed the library of physical process from "standard" to "lowenergy" but the same thing happened. So I guess that is not the problem. I attached my macro file for all GATE users to review. If you find anything wrong (or suspicious), please let me know. Thanks a lot.<o:p></o:p> <div>  <o:p></o:p> </div> Hongwei<o:p></o:p> <div> <o:p> </o:p> </div> <div> <o:p> </o:p> <div> <div class=MsoNormal align=center style='text-align:center'> <hr size=1 width="100%" align=center> </div> From: WuGuocheng <wuguocheng@neusoft.com> To: howellye@yahoo.com Cc: gate-users@lists.healthgrid.org Sent: Thursday, March 5, 2009 7:24:10 PM Subject: 答复: Gate-users Digest, Vol 34, Issue 4 Hi Hongwei, I also encountered this problem before,  but I can't find the problem, so I attached my macro to help, finally find that the process of physics define error. So, if you haven't resolve the problems, maybe you can attached your macros. And all the gate users will check them for you. Good luck. ---------------------------------------------------------------------- Guocheng Wu Software Department Neusoft Positron Medical Systems Co.,Ltd. No.2 Xin Xiu Street, Hun Nan New District, Shenyang 110179, PRC Tel: (86 24) 836 61980 Fax: (86 24) 836 61796 Mobile: 13604039065 Email: <a href="mailto:wuguocheng@neusoft.com">wuguocheng@neusoft.com</a> Website: <a href="http://medical.neusoft.com" target="_blank">http://medical.neusoft.com</a> ---------------------------------------------------------------------- Dear GATE group and users, I found a wield thing when I simulated a LYSO-based PET system: the line source is put out of FOV and inside a polyethylene cylinder. The purpose of this simulation is to find how many scatters come from the source outside FOV. However, some true coincidences (about 1.5%) were found!! I have checked their annihiliation positions using ASCII output and they indeed came from the line source. If I connected two detecors using a line, annihilations CANNOT locate on this line ( not even close to). One example is given below. If you just checked Z positions and you can find the problem: 2.181e+02 for annihilation, 7.711e+01 for one single, and 1.479e+02 for another single. And NO scattering happens before photons entered the detectors. 0  608372    0 9.598e-01 -4.609e+01 2.181e+02 4.68951501753163224606169e+00 6.184e-01 -3.021e+02 -3.291e+02 7.711e+01    0    30    0    0  791 0      0    1    0    0 0.000e+00 0.000e+00      0  608372    0 9.598e-01 -4.609e+01 2.181e+02 4.68951501764343259281986e+00 4.892e-01 4.002e+02 1.912e+02 1.479e+02    0    3    0    0  1026    0 0    0    0    0 0.000e+00 0.000e+00 Could anyone give explainations for this??  Thank you very much. Regards, Hongwei       > > _______________________________________________ > Gate-users mailing list > <a href="mailto:Gate-users@lists.healthgrid.org">Gate-users@lists.healthgrid.org</a> > <a href="http://lists.healthgrid.org/mailman/listinfo/gate-users" target="_blank">http://lists.healthgrid.org/mailman/listinfo/gate-users</a> > > -------------- next part -------------- An HTML attachment was scrubbed... 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