<div dir="ltr"><div dir="ltr"><div dir="auto">Dear Miriam,</div><div dir="auto"><br></div><div>As per my experience , the below script <b>/gate/digitizer/Singles/blurring/inverseSquare/setResolution 0.085, </b>Set the value of the energy window, so changing the energy window will change the value of energy resolution that you get from singles.</div><div>Let assume Tc-99 which has reference energy 140kev, so, in this case if you set <b>setResolution 0.085 </b>, you are using energy window of 8.5 % which means energy above 140+8.5=148.5kev and below 140-8.5=131.5 will not appear in your energy resolution graph, and FWHM will be calculated within in this window.</div><div><br></div><div>Similarly, if you increase the energy window to 10%
<b>setResolution 0.10 </b>the energy below 130kev and above 150kev will be skipped. and hence FWHM will be calculated from this window and this value with 10% energy window will be a gigger value then the energy window of 8.5%.</div><div><br></div><div>Cheers,</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Aug 24, 2020, 9:24 AM Miriam Dixon <<a href="mailto:miriam.gatemc@gmail.com" target="_blank">miriam.gatemc@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>Hi Gate Users,</div><div><br></div><div>I am modelling a physical SPECT system in GATE, and so trying to get my simulation parameters as close as possible to the physical system parameters. I am slightly confused about the energy resolution settings within GATE. When I set the energy resolution in the digitizer to match the measured energy resolution of my physical system (0.095, 9.5%) the energy spectrum output shows a FWHM of my photo peak of ~10.6%. When I reduce the given energy resolution to 0.085, I get a FWHM of 9.5%. The EnergyOfReference is the same as the value of the photo peak of my spectrum. What I have is usable, but I am very interested to know if anyone has an explanation for this difference.</div><div><br></div><div>The energy resolution section of my digitizer macro reads:<br># Energy Blurring<br>/gate/digitizer/Singles/insert blurring<br>/gate/digitizer/Singles/blurring/setLaw inverseSquare<br>/gate/digitizer/Singles/blurring/inverseSquare/setResolution 0.085<br>/gate/digitizer/Singles/blurring/inverseSquare/setEnergyOfReference 140.0 keV</div><div><br></div><div>I am using vGate v9.0</div><div><br></div><div>Cheers,</div><div>Miriam<br></div><div><br></div></div>
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