<HTML> <HEAD> <TITLE>Re: [gate-users] voxelized phantom color attributes</TITLE> </HEAD> <BODY> Hi guys, The meaning of the “a b c d parameters” are:  red, green, blue, alpha.  They are values between 0 and 1.  Alpha controls transparency (0-transparent, 1-opaque) and is supported only by some viewers. G4RayTracer is one of them. Richard On 2/7/06 1:52 AM, "Graeme O'Keefe" <graeme.okeefe@petnm.unimelb.edu.au> wrote: <BLOCKQUOTE>The voxelised "phantom" uses range.dat. for example: % cat gate_v2.2.0/examples/example_PHAMTOM_SOURCE/Voxelized_Phantom_Source/range.dat 5 0 0 Air false 0.0 0.0 0.0 0.2 6 6 Lung false 1.0 0.0 0.0 0.2 6 16 Breast false 0.0 1.0 0.0 0.2 16 36 Plastic true 0.0 0.0 1.0 0.2 36 200 Air false 0.0 0.0 0.0 0.2 5 classes lld uld material flag a b c d The 'material' voxels are those for which lld < voxels < uld where the "material" is defined in GateMaterials.db The flag indicates whether to display the phantom when visualising the 'a,b,c,d' parameters are related to the colour/line-style/line-width etc. to display the material. I don't have the exact details for that right now. You can see the list of materials available (and add your own) in: gate_v2.2.0/GateMaterials.db regards, Graeme On 07/02/2006, at 8:17 AM, Dale Bailey wrote: <BLOCKQUOTE> The GATE documentation states the following under the "Voxelised Source" section (under fig 7..1)   " GATE also offers the possibility to read in voxelised attenuation geometries following these two strategies. The gray scale is then converted to material definitions in that case using an analogous translator. "   Is there any documentation available on how to do this? Is there a file like "activityRange.dat" that contains the attenuation coefficients required?   Thanks,   Dale   Dale L Bailey PhD CSci ARCP(Lond) FIPEM MACPSEM Principal Physicist, Department of Nuclear Medicine, Royal North Shore Hospital Senior Lecturer in Physics, School of Medical Radiation Sciences and Clinical Associate Professor, Faculty of Medicine University of Sydney phone: +61 (0)402 892 051 FAX: +61 (0)2 9906 1124 email: D.Bailey@fhs.usyd.edu.au <mailto:D.Bailey@fhs.usyd.edu.au> _______________________________________________ gate-users mailing list gate-users@lphe1pet1.epfl.ch http://lphe1pet1.epfl.ch/mailman/listinfo/gate-users   </BLOCKQUOTE>   <HR ALIGN=CENTER SIZE="3" WIDTH="95%"><TT>_______________________________________________ gate-users mailing list gate-users@lphe1pet1.epfl.ch http://lphe1pet1.epfl.ch/mailman/listinfo/gate-users </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>