[gate-users] Quantum Efficiency Tables

[Schmidtlein, Ross/Sloan-Kettering Institute]

Hi Martin,

Thanks, what you said makes sense.  It isn't exactly what I want though.
I am blurring the energy with the crystal energy blur and would like to
selectively remove a portion of the events to mimic losses between the
crystals and the PMT's and the rest of the signal processing chain.  I
can do this with the other quantum efficiency command but only globally
not on a crystal by crystal basis inside a block.  Getting the losses
correctly is important for deadtime effects and doing it to match the
crystal locations is important in order to match the spatial blurring
and then the normalization.  Any ideas?  

ross

-----Original Message-----
From: gate-users-bounces at lphe1pet1.epfl.ch
[mailto:gate-users-bounces at lphe1pet1.epfl.ch] On Behalf Of Martin Rey
Sent: Monday, December 12, 2005 5:16 PM
To: GATE feedback and helpline for Users
Subject: Re: [gate-users] Quantum Efficiency Tables


Hi Ross,

It is actually what it does. In fact, as the scintillation photons are 
not simulated in Gate (until now), it seemed righter to me to reduce the

energy of the pulse. In fact, the result will be rather something 
proportional to the scintillation photon number than energy. I used it 
to simulate the differences between the peak position of our pixels 
observed on real data. Than, I could apply a kind of hardware threshold 
(the same for all pixels) and then did a re-calibration in energy. I 
hope you understood my explanation.

Schmidtlein, Ross/Sloan-Kettering Institute wrote:

>I am looking at how to mimic the behavior of a detector block (6x6
>crystals) by cutting some of the events in the corners and edges of the

>block.  I was trying to use the following commands:
>
>/gate/digitizer/Singles/insert quantumEfficiency 
>/gate/digitizer/Singles/quantumEfficiency/chooseQEVolume crystal 
>/gate/digitizer/Singles/quantumEfficiency/useFileDataForQE QE.dat
>
>Where QE.dat contains 36 numbers ranging from .5 to 1.0.
>
>Instead of randomly cutting events this command seems to be reducing 
>the energy per event in proportion to the QE.dat table.  Is this what 
>this command is supposed to be doing?  It doesn't look that way in the 
>users guide.  Does anyone have any ideas?  I'm hoping to avoid digging 
>through the code. ;)
>
>Thanks,
>
>ross
>
>
>
>
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