[Gate-users] Measuring the Energy Spectrum

[Ane Etxebeste]

Hi Miriam,
The digitizer is applied to the detected hit-collection to simulate the 
detector response creating singles 
(https://opengate.readthedocs.io/en/latest/digitizer_and_detector_modeling.html).

You can use the following commands to recover the singles and verify the 
applied energy resolution in the 
digitizer.(https://opengate.readthedocs.io/en/latest/data_output_management.html)

/gate/output/tree/enable
/gate/output/tree/addFileName output/fileName(.root/.npy/.txt)
/gate/output/tree/addCollection Singles

Regards,
Ane

On 2020-08-11 02:17, Miriam Dixon wrote:
> Hello,
> 
> I want to measure the energy spectrum of my source as seen by my SPECT
> detector (after the energy blurring has been applied by the
> digitizer). I tried using the EnergySpectrumActor, as described below,
> but the peak appeared narrower than I expected. I tried changing the
> energy resolution value in my digitizer (also described below) but
> changing the value made no difference to the shape of the energy
> spectrum.
> 
> How do I measure the energy spectrum after the blurring is applied -
> am I using the wrong actor?
> 
> #Energy Spectrum Actor
> 
> /gate/actor/addActor   EnergySpectrumActor          Energy
> /gate/actor/Energy/save
> output/EnergyScoring.root
> /gate/actor/Energy/energySpectrum/setEmin           90 eV
> /gate/actor/Energy/energySpectrum/setEmax           170 keV
> /gate/actor/Energy/energySpectrum/setNumberOfBins   80
> /gate/actor/Energy/enableNbPartSpectrum             true
> /gate/actor/Energy/attachTo                         crystal_volume
> 
> # Energy Blurring in Digitizer
> /gate/digitizer/Singles/insert blurring
> /gate/digitizer/Singles/blurring/setLaw inverseSquare
> /gate/digitizer/Singles/blurring/inverseSquare/setResolution 0.15
> /gate/digitizer/Singles/blurring/inverseSquare/setEnergyOfReference
> 140.0 keV
> 
> I am using GATE v9.0 and my source is Tc-99m (140 keV photons).
> 
> Many thanks,
> 
> Miriam
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