[gate-users] about random coincidences

[Amarnath Srinivasan]

Hello,

We were running gate on RedHat 9 . When the output ascii file "gate_coincidence.dat" size  exceeded 2GB I got an error saying maximum file size exceeded and the program terminated.
Does anybody have idea on how to fix this problem.



thankyou
Amarnath Srinivasan
Research Assistant
Center for Advanced Imaging
PO Box 9235
Dept of Radiology, HSC, WVU
Morgantown, WV 26506
asrinivasan at hsc.wvu.edu
  ----- Original Message ----- 
  From: yuxuan.zhang at di.mdacc.tmc.edu 
  To: gate-users at lphe1pet1.epfl.ch 
  Sent: Tuesday, August 24, 2004 5:08 PM
  Subject: [gate-users] about random coincidences 



  hi all, 

  In my simulation I noticed a strange result that I can not figure it out. 
  My setup is that: using cylindricalPET system with 30 rsetors, one point 
  source at the center. The radiation activity is very high, thus there are 
  lots of random coincidences (accidental coincidences) in the totoal 
  coincidences. Now I do the statistics on these random coincidences according 
  to the sector index, then I found that the coincidences between 2 opposite rsectors 
  (e.g. No.0 and 15, or No.5 and 20) are much more than the coincidences between other 
  2 sectors ( No. 0 and 14, or No. 0 and 16 ...) Usually the difference can be 50% or 100% depend on the thickness of the detector. Is anyone else noticed that? 
  Can you have a try in your computer to find out whether this is a bug of GATE or there 
  is somthing wrong with my simulation? Thank you very much. 


  Best regards, 

  Yuxuan Zhang 


  Dr. Yuxuan ZHANG 
  Dept. Experimental Diagnostic Imaging
  Univ. Texas, MD Anderson Cancer Center
  1515 Holcombe Blvd, Unit 217
  Houston, TX 77030-4095

  Tel: +1-713-745-1671 
  Fax: +1-713-745-1672


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