[Gate-users] GATEv6.2 Cerenkov simulation

[강한규]

Dear SeungEun Lee
 
I have an experience in the simulation of Cerenkov photons with GATEv6.2 for optical imaging application.
 
The number of Cerenkov photons with different positron energies could be simulated successfully (See the attached files slide#39-47) 

Here is the optical physics processes that I used for the Cerenkov imaging simulation. 
 
# =========================================
# optical physics
# =========================================
 
# Scintillation
#/gate/physics/addProcess Scintillation
# Cerenkov (2016.11.24.KangHG)
/gate/physics/addProcess Cerenkov
 
# optical process 
/gate/physics/addProcess 	OpticalAbsorption
/gate/physics/addProcess 	OpticalRayleigh
/gate/physics/addProcess 	OpticalBoundary
/gate/physics/addProcess 	OpticalMie
/gate/physics/addProcess 	OpticalWLS
 
/gate/physics/processList 	Enabled
/gate/physics/processList 	Initialized
 
 
In my opinion, the kinetic energy of a photo-electron produced by a 511 keV gamma photon should be larger than 280 keV.
 
This is because, the Cerenkov light yield is heavily dependent on the positron(or electron) energy (slide#46-47).
 
Could you let me know the version of GATE and Geant4?  
 
I would like to know the optical simulation parameters contained in Materials.xml.
-Refractive index of BGO material (RINDEX)
-Absorption length of the BGO(ABSLength)
 
Also I would like to know the quantum efficiency of your detector as a function of optical photon energy which is contained in Surfaces.xml.
As you know the number of Cerenkov photons is inversely proportional to the wavelength.(slide#43)
 
What type of scanner do you use? (ex> scanner, OpticalSystem)
 
Hopefully, my optical simulation results could help your Cerenkov simulation.
 
 
Best regards,
 
Han Gyu Kang, PhD student
 
Eulji University, South Korea. 


 
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Sent: 2017-01-19 (목) 20:00:01
Subject: Gate-users Digest, Vol 128, Issue 14
 
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Today's Topics:

   1. Cerenkov simulation (SeungEun Lee)


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Message: 1
Date: Thu, 19 Jan 2017 11:25:07 +0900
From: SeungEun Lee <seungeun058 at gmail.com>
To: gate-users at lists.opengatecollaboration.org
Subject: [Gate-users] Cerenkov simulation
Message-ID:
	<CAG3MY96eJBo7uMEtJxkBi8q9tRCwnYo41moUdHB1D4QcmwX9gA at mail.gmail.com>
Content-Type: text/plain; charset="utf-8"

Dear Gate users,

I'm looking forward to observe Cerenkov effects in BGO crystal with 511 keV
gamma ray irradiated. I added Cerenkov to the physics list.


###
/gate/physics/addProcess Cerenkov
###


However, the most important thing is, that there are too small number of
Cerenkov events (3 per 100Mevents). It is known that more than 10 Cerenkov
photon photon emitted per 511 keV gamma ray and also it is shown in many
GEANT4 works previously.

Also I wanted to see the Cerenkov photons' origins of generation. I mean
which ID and which physical process (photoelectric or Compton) generated
this Cerenkov photon. But there are only 'Cerenkov' events written in Hits
file. ID of generation is just said to be electron.

Did anyone simulate Cerenkov effects in GATE successfully? Is there any tip
to solve this?


Thanks a lot.
Seungeun Lee.
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