<HTML> <HEAD> <TITLE>Re: [Gate-users] question about setting x-ray sources in mammography</TITLE> </HEAD> <BODY> Hi Yiheng, There is no pre-defined x-ray source in Gate.  You will have to use the generalized particle source (gps) with a user-defined photon energy spectrum.  If you can’t find the spectrum you need in the literature, you can either use an estimate ( by analytical means ) or  a spectrum obtained by simulating the source (electron gun and target).  (I have done that to simulate out microCT scanner) Richard On 3/23/08 1:39 PM, "Yiheng Zhang" <yihengzhang@gmail.com> wrote: <BLOCKQUOTE>Dear Gators, I am new in Gate tools and now working to simulate scattering in x-ray mammography for breast imaging. I have learned the benchmark examples of PET and SPECT and also the user's guide. Now I have a quick question, how to set up the x-ray source in mammography system? For example, if I like to simulate a Rhodium target with a Rhodium filter (Rh/Rh) with about 30 KVp, is there any source already listed in Gate for that purpose? or I should specify the source material by myself? Thank you very much for the help. Yiheng <HR ALIGN=CENTER SIZE="3" WIDTH="95%"><TT>_______________________________________________ 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> </TT></BLOCKQUOTE><TT> </TT> -- Richard Taschereau, Ph.D. Crump Institute for Molecular Imaging University of California Los Angeles 700 Westwood Plaza, A222 Los Angeles, CA 90095-1770 Phone: (310) 825-0697 Fax:     (310) 206-8975 email: RTaschereau@mednet.ucla.edu ---------------------------------------------------------- IMPORTANT WARNING: This email (and any attachments) is only intended for the use of the person or entity to which it is addressed, and may contain information that is privileged and confidential. You, the recipient, are obligated to maintain it in a safe, secure and confidential manner. Unauthorized redisclosure or failure to maintain confidentiality may subject you to federal and state penalties. If you are not the recipient, please immediately notify us by return email, and delete this message from your computer. ---------------------------------------------------------- </BODY> </HTML>