[Gate-users] SpekCalc vs GATE x-ray energy spectrum

Emmanuel Marfo emmanuel.marfo at postgrad.otago.ac.nz
Wed Oct 11 11:04:08 CEST 2017 

Thanks very much for your quick responses. I will work around the binning of the energy and see what happens. If I get them correctly, I will report back.

Best regards,

Emmanuel Marfo

________________________________
From: rachid ayad <rayad at ut.edu.sa>
Sent: Wednesday, 11 October 2017 9:44:55 p.m.
To: Emmanuel Marfo
Cc: Simon Rit; gate-users at lists.opengatecollaboration.org; Mohammad K. Ibrahim Al Matari
Subject: Re: [Gate-users] SpekCalc vs GATE x-ray energy spectrum



  Dear Emmanual, I think this is due to how we bin a histogram. Often we need to center the filled data in the histogram within the center of the bin for some specific values. For example we would like in the below example to center integer values: 0,,1, to 10 within the bin center so limits and number of bins should be given like:

      step = 1
      xmin     =  0. - step/2.
      xmax    =  10. + step/2.
      nbins   = (xmax-xmin)/step

So here you enter histograms limits xmin=-.5 and xmax=10.5 and nbins = 11 and your histograms will be centered on values 0,1,2 to 10 not shifted with one half bin if you enter xmin=0, xmax=10, and nbins = 10. Here  the first bin is centered at 0.5 and the next will be centered at 1.5 and the last at 9.5 . So I think what you did and what they did is one is shifted respect the other on how you defined your inputs to create the histogram.

Thank you, Rachid Ayad


On Wed, Oct 11, 2017 at 11:29 AM, Emmanuel Marfo <emmanuel.marfo at postgrad.otago.ac.nz<mailto:emmanuel.marfo at postgrad.otago.ac.nz>> wrote:

Please, in my simulation. I modelled the anode(rectangular geometry with thickness 1mm and cathode(source type: plane and shape: circle, source energy: monoenergetic electron(120keV)), filters(aluminium and copper), all according to the specification of our x-ray manual. I was able to generate an x-ray energy spectrum from this setup. I used both Penelope and emstandard_opt3 which apparently gives similar results.


Secondly, I used the same parameters in SpekCalc program. A program for calculating x-ray energy spectrum. I, therefore, compared the two spectra as a way of validating my spectrum from GATE. This gives the results of the image attached. If you need more info please let me know. Thanks

________________________________
From: simon.rit at gmail.com<mailto:simon.rit at gmail.com> <simon.rit at gmail.com<mailto:simon.rit at gmail.com>> on behalf of Simon Rit <simon.rit at creatis.insa-lyon.fr<mailto:simon.rit at creatis.insa-lyon.fr>>
Sent: Wednesday, 11 October 2017 7:38:45 p.m.
To: Emmanuel Marfo
Cc: gate-users at lists.opengatecollaboration.org<mailto:gate-users at lists.opengatecollaboration.org>
Subject: Re: [Gate-users] SpekCalc vs GATE x-ray energy spectrum

Hi,
I am not sure I understand what we are looking at. What was the x-ray source in your Gate simulation? I think it would help to have the full simulation.
Best regards,
Simon

On Wed, Oct 11, 2017 at 3:47 AM, Emmanuel Marfo <emmanuel.marfo at postgrad.otago.ac.nz<mailto:emmanuel.marfo at postgrad.otago.ac.nz>> wrote:

Hi GATE users,

Find attached file 'SpekCalc vs GATE x-ray energy spectrum' which compares the two spectrums. My problem is the  GATE characteristics spectrum is shifted to the right a bit when compared to the characteristics energy spectrum from SpekCalc. Please, I want to know how I can make it align with that of spekcalc. I used the energyspectrum actor definition below

### E N E R G Y S P E C T R U M ######
######################################
/gate/actor/addActor             EnergySpectrumActor espectrum
/gate/actor/espectrum/attachTo   phantom
/gate/actor/espectrum/save     Desktop/PHDthesisGATE/MARFO2017/ModellingX-raytube/XraytubeCU/output/cylinderespectrum.root
/gate/actor/espectrum/addFilter particleFilter
/gate/actor/espectrum/particleFilter/addParticle gamma
/gate/actor/espectrum/energySpectrum/setEmin           0 eV
/gate/actor/espectrum/energySpectrum/setEmax           0.12 MeV
/gate/actor/espectrum/energySpectrum/setNumberOfBins   120
/gate/actor/espectrum/energyLossHisto/setEmin          0 eV
/gate/actor/espectrum/energyLossHisto/setEmax          0.12 MeV
/gate/actor/espectrum/energyLossHisto/setNumberOfBins  120

Thanks

Best regards,

Emmanuel Marfo

University of Otago

Student

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--
Dr. Rachid Ayad
Department of Physics, Faculty of Science
University Of Tabuk
P.O. Box 2072
Tabuk 71451
Kingdom Of Saudi Arabia
Tel: +966560296632



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