[Gate-users] how to modified the parameters when the simulated Scatter fraction is too highter than the measured value?

Fri May 18 04:52:28 CEST 2012

Dear all,

I simulated GE Discovery LS PET system and then tried to analysis its performance. I have done scatter fraction simulation follow NEMA94. 
However, I find the simulation SF value is too higher (SF=50%) than the measured value (SF=36%) from 3D acquire.
I appreciate if you let me know of which parameter be modified, or how to defined the digitizer?

I defined the digitizer as follows:

#-------------------oooooOOOOO00000OOOOOooooo---------------------#
#  D E F I N I T I O N   O F   Y O U R   A C Q U I S I T I O N    #
#  D I G I T I Z E R   &   C O I N C I D E N C E   S H O R T E R  #
#-------------------oooooOOOOO00000OOOOOooooo---------------------#

#       A D D E R
/gate/digitizer/Singles/insert adder

#       R E A D O U T 
/gate/digitizer/Singles/insert readout
/gate/digitizer/Singles/readout/setDepth 1

#      E N E R G Y   B L U R R I N G
/gate/digitizer/Singles/insert blurring
/gate/digitizer/Singles/blurring/setResolution 0.2
/gate/digitizer/Singles/blurring/setEnergyOfReference 511. keV

#  C R Y S T A L B L U R R I N G
/gate/digitizer/Singles/insert crystalblurring
/gate/digitizer/Singles/crystalblurring/setCrystalResolutionMin 0.20
/gate/digitizer/Singles/crystalblurring/setCrystalResolutionMax 0.35
/gate/digitizer/Singles/crystalblurring/setCrystalQE  0.9058
/gate/digitizer/Singles/crystalblurring/setCrystalEnergyOfReference 511. keV

#       E N E R G Y   C U T
/gate/digitizer/Singles/insert thresholder
/gate/digitizer/Singles/thresholder/setThreshold 300. keV
/gate/digitizer/Singles/insert upholder
/gate/digitizer/Singles/upholder/setUphold 600. keV
#       D E A D    T I M E 
/gate/digitizer/Singles/insert deadtime
/gate/digitizer/Singles/deadtime/setDeadTime 300. ns
/gate/digitizer/Singles/deadtime/setMode paralysable
/gate/digitizer/Singles/deadtime/chooseDTVolume Head

#       C O I N C I    S O R T E R 
/gate/digitizer/Coincidences/setWindow 11.7 ns
/gate/digitizer/Coincidences/minSectorDifference 16
/gate/digitizer/Coincidences/setDepth 1

Thank you for your attention.

2012-05-18

Wugc
No. 16 Century Road. Hun Nan New District
Shenyang 110179, PRC

From: gate-users-request at lists.opengatecollaboration.org
Date: 2012-05-16 18:00
To: gate-users at lists.opengatecollaboration.org
Subject: Gate-users Digest, Vol 72, Issue 16
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Today's Topics:

   1. Re: data output (Edgar Gelover)

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Message: 1
Date: Tue, 15 May 2012 09:52:24 +0100
From: "Edgar Gelover" <egelover at medphys.ucl.ac.uk>
To: "'Mike Tabriz'" <mtabriz at yahoo.com>,
<gate-users at lists.opengatecollaboration.org>
Subject: Re: [Gate-users] data output
Message-ID: <000601cd3278$0c0b8bc0$2422a340$@ucl.ac.uk>
Content-Type: text/plain; charset="iso-8859-1"

Dear Mike,

My colleagues and I have been using "3D-Slicer" you can download it here for
free:

http://www.slicer.org/

There is also an application in the MATLAB user libraries to open ANALYZE
files. 

http://www.mathworks.com/matlabcentral/fileexchange/8797

Best Regards,
Edgar

-----Mensaje original-----
De: Mike Tabriz [mailto:mtabriz at yahoo.com] 
Enviado el: 14 May 2012 16:37
Para: gate-users at lists.opengatecollaboration.org
Asunto: [Gate-users] data output

Hi folks,
I have finally managed to get an output for my 3D dose distribution code in
the HDR/IMG (Analyze) format. According to Talk9-GATE_RT.pdf I would need a
specific tool to analyze such output. Could someone please let me know what
specific tool I need along with some guidance on how to use it.
?
?
Thank you,
Mike?

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

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