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

[rachid ayad]

  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> 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 <simon.rit at gmail.com> on behalf of Simon Rit <
> 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
> *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> 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/MARFO201
>> 7/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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>> Gate-users at lists.opengatecollaboration.org
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>>
>
>
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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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