[Gate-users] Gate-users Digest, Vol 34, Issue 11

[Chen, Yu]

Hi, Mario,

When you do such a comparison, are you sure:

1, geometry is the same?
2, material definition is the same?
3, physics list is the same?
4, the interaction range cut is the same?
5, how do you define the singles in GATE and Geant4?

I also noticed that the total entry in GATE spectrum plot is only 2455 but you mentioned there are 3713. Where are others?

Yu Chen, Ph.D. 
University of Massachusetts Medical School 
Department of Radiology 
55 Lake Avenue North 
Worcester, MA 01655-0243 
Phone: (508) 856-6123 
Fax: (508) 856-6363



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Today's Topics:

   1. GATE and Geant4 comparison (mario bachaalany)
   2. GATE and Geant4 comparison (mario bachaalany)


----------------------------------------------------------------------

Message: 1
Date: Fri, 13 Mar 2009 13:15:29 +0100
From: mario bachaalany <mario at sbgmail.in2p3.fr>
Subject: [Gate-users] GATE and Geant4 comparison
To: gate-users at lists.healthgrid.org
Message-ID: <49BA4E61.2070207 at sbgmail.in2p3.fr>
Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"

Hi all,

I'm comparing the results obtained with GATE (4.0.0) and Geant4 
(4.9.1.p01) for the interaction of gamma rays (511 keV) with a LYSO 
crystals. In a previous email, I already mentioned that there is some 
differences concerning the photoelectric fraction.
The numbers below are the results of a LYSO crystal already defined in 
the GATE list of materials.

                                                              
Geant4                  GATE

Number of generated gammas :               50000                   49805
Number of detected singles:                      4511 
                    3713
Photoelectric fraction:                                
30%                    23.3%

I attached the two different spectra obtained with GATE and Geant4.
If anyone has the same problem or can be explain this difference, please 
help.

Thanks in advance.
Mario

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Message: 2
Date: Fri, 13 Mar 2009 13:40:22 +0100
From: mario bachaalany <mario at sbgmail.in2p3.fr>
Subject: [Gate-users] GATE and Geant4 comparison
To: gate-users at lists.healthgrid.org
Message-ID: <49BA5436.4030801 at sbgmail.in2p3.fr>
Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"


      Hi all,



      I'm comparing the results obtained with GATE (4.0.0) and Geant4
      (4.9.1.p01) for the interaction of gamma rays (511 keV) with a
      LYSO crystals. In a previous email, I already mentioned that there
      is some differences concerning the photoelectric fraction.


      The numbers below are the results of a LYSO crystal already
      defined in the GATE list of materials.



      	


            Geant4

      	


            GATE


            Number of generated gammas :

      	


            50000

      	


            49805


            Number of detected singles:

      	


            4511

      	


            3713


            Photoelectric fraction:

      	


            30.00%

      	


            23.30%


      I attached the two different spectra obtained with GATE and Geant4.


      If anyone has the same problem or can be explain this difference,
      please help.



      Thanks in advance.


      Mario

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