<div dir="ltr"><br><div><br></div><div> 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:</div><div><br></div><div> step = 1</div><div> xmin = 0. - step/2.</div><div> xmax = 10. + step/2.</div><div> nbins = (xmax-xmin)/step</div><div><br></div><div>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.</div><div><br></div><div>Thank you, Rachid Ayad</div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Oct 11, 2017 at 11:29 AM, Emmanuel Marfo <span dir="ltr"><<a href="mailto:emmanuel.marfo@postgrad.otago.ac.nz" target="_blank">emmanuel.marfo@postgrad.otago.ac.nz</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div>
<div id="m_-5290372597349575319divtagdefaultwrapper" style="font-size:12pt;color:#000000;font-family:Calibri,Helvetica,sans-serif" dir="ltr">
<p>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)<wbr>), 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.</p>
<p><br>
</p>
<p>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</p>
</div>
<hr style="display:inline-block;width:98%">
<div id="m_-5290372597349575319divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> <a href="mailto:simon.rit@gmail.com" target="_blank">simon.rit@gmail.com</a> <<a href="mailto:simon.rit@gmail.com" target="_blank">simon.rit@gmail.com</a>> on behalf of Simon Rit <<a href="mailto:simon.rit@creatis.insa-lyon.fr" target="_blank">simon.rit@creatis.insa-lyon.<wbr>fr</a>><br>
<b>Sent:</b> Wednesday, 11 October 2017 7:38:45 p.m.<br>
<b>To:</b> Emmanuel Marfo<br>
<b>Cc:</b> <a href="mailto:gate-users@lists.opengatecollaboration.org" target="_blank">gate-users@lists.<wbr>opengatecollaboration.org</a><br>
<b>Subject:</b> Re: [Gate-users] SpekCalc vs GATE x-ray energy spectrum</font>
<div> </div>
</div><div><div class="h5">
<div>
<div dir="ltr">
<div>
<div>
<div>Hi,<br>
</div>
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.<br>
</div>
Best regards,<br>
</div>
Simon<br>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Wed, Oct 11, 2017 at 3:47 AM, Emmanuel Marfo <span dir="ltr">
<<a href="mailto:emmanuel.marfo@postgrad.otago.ac.nz" target="_blank">emmanuel.marfo@postgrad.<wbr>otago.ac.nz</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">
<div id="m_-5290372597349575319m_-158833260913910576divtagdefaultwrapper" style="font-size:12pt;color:#000000;font-family:Calibri,Helvetica,sans-serif" dir="ltr">
<p>Hi GATE users,</p>
<p>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</p>
<p></p>
<div>### E N E R G Y S P E C T R U M ######</div>
<div>##############################<wbr>########</div>
<div>/gate/actor/addActor EnergySpectrumActor espectrum</div>
<div>/gate/actor/espectrum/attachTo phantom</div>
<div>/gate/actor/espectrum/save Desktop/PHDthesisGATE/MARFO201<wbr>7/ModellingX-raytube/XraytubeC<wbr>U/output/cylinderespectrum.<wbr>root</div>
<div>/gate/actor/espectrum/addFilte<wbr>r particleFilter</div>
<div>/gate/actor/espectrum/particle<wbr>Filter/addParticle gamma</div>
<div>/gate/actor/espectrum/energySp<wbr>ectrum/setEmin 0 eV</div>
<div>/gate/actor/espectrum/energySp<wbr>ectrum/setEmax 0.12 MeV</div>
<div>/gate/actor/espectrum/energySp<wbr>ectrum/setNumberOfBins 120</div>
<div>/gate/actor/espectrum/energyLo<wbr>ssHisto/setEmin 0 eV</div>
<div>/gate/actor/espectrum/energyLo<wbr>ssHisto/setEmax 0.12 MeV</div>
<div>/gate/actor/espectrum/energyLo<wbr>ssHisto/setNumberOfBins 120</div>
<div><br>
</div>
Thanks
<p></p>
<p>Best regards,</p>
<p>Emmanuel Marfo</p>
<p>University of Otago</p>
<p>Student </p>
</div>
</div>
<br>
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</blockquote>
</div>
<br>
</div>
</div>
</div></div></div>
<br>______________________________<wbr>_________________<br>
Gate-users mailing list<br>
<a href="mailto:Gate-users@lists.opengatecollaboration.org">Gate-users@lists.<wbr>opengatecollaboration.org</a><br>
<a href="http://lists.opengatecollaboration.org/mailman/listinfo/gate-users" rel="noreferrer" target="_blank">http://lists.<wbr>opengatecollaboration.org/<wbr>mailman/listinfo/gate-users</a><br></blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div>Dr. Rachid Ayad<br>Department of Physics, Faculty of Science</div>
<div>University Of Tabuk</div><div>P.O. Box 2072</div><div>Tabuk 71451<br>Kingdom Of Saudi Arabia<br>Tel: +966560296632<br> </div></div></div>
</div>
<br>
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