<div dir="ltr"><div><div><div><div>Hi Fernando<br><br></div>Thanks for your answer!<br><br></div>In fact, I don't define any deadtime in my digitizer, it's just:<br><br>/gate/digitizer/Singles/insert adder<br>/gate/digitizer/Singles/insert blurring<br>/gate/digitizer/Singles/blurring/setResolution 0.1<br>/gate/digitizer/Singles/blurring/setEnergyOfReference 122. keV<br>/gate/digitizer/Singles/insert spblurring<br>/gate/digitizer/Singles/spblurring/setSpresolution 0.8 mm<br>/gate/digitizer/Singles/spblurring/verbose 0<br><br></div>Does it mean there is a "default" deadtime that I wasn't accounting for?<br><br></div>Regards,<br></div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><span style="border-collapse:separate;color:rgb(0,0,0);font-family:Helvetica;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:-webkit-auto;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;border-spacing:0px"></span><span style="color:rgb(7,55,99)"><span style="font-family:tahoma,sans-serif"></span><span style="font-family:tahoma,sans-serif">Debora Salvado, MSc</span></span><br><div><span style="color:rgb(7,55,99)"><span style="font-family:tahoma,sans-serif">PhD Student<br></span></span></div><span style="color:rgb(7,55,99)"><span style="font-family:tahoma,sans-serif">University College London<br>INM, UCLH, </span></span><span style="color:rgb(7,55,99)"><span style="font-family:tahoma,sans-serif"><span><span style="color:rgb(7,55,99)"><span style="font-family:tahoma,sans-serif"> (T-5) </span></span></span>235 Euston Road<br></span></span><span style="color:rgb(7,55,99)"><span style="font-family:tahoma,sans-serif">London NW1 2BU<br></span></span><span style="color:rgb(7,55,99)"><span style="font-family:tahoma,sans-serif">UK</span></span><span style="color:rgb(12,52,61)"><span style="font-family:tahoma,sans-serif"></span></span><br></div></div></div></div></div></div>
<br><div class="gmail_quote">2015-04-20 16:34 GMT+01:00 Fernando Rannou <span dir="ltr"><<a href="mailto:fernando.rannou@usach.cl" target="_blank">fernando.rannou@usach.cl</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Just wondering whether deadtime effects have to do anything with it.<br>
If you have more activity...<br>
<br>
Fernando<br>
<div><div class="h5"><br>
On Fri, Apr 17, 2015 at 3:54 PM, Débora Salvado <<a href="mailto:debbiesal@gmail.com">debbiesal@gmail.com</a>> wrote:<br>
> Dear GATE users<br>
><br>
> I have a SPECT setup as exemplified in the attached file setup.png<br>
><br>
> I run different simulations:<br>
> 1) I123 (159 and 529keV) 185MBq in the patient volume<br>
> 2) Lu176 (88, 200 and 300keV) 5.6MBq in the LSO volume<br>
> 3) I123 185MBq and Lu176 5.6MBq in the respective volumes<br>
><br>
> In the file energySpectra.png, I show you the energy spectra obtained when<br>
> running every simulation for 1 minute. Can someone explain me why the dashed<br>
> and the black energy spectra are different?<br>
> The dashed spectrum is just a sum of the red and green data series.<br>
><br>
> In my opinion, the proportion of the peaks in the black spectrum seems<br>
> correct (simulation with both sources), but then why doesn't it correspond<br>
> to the sum of the counts obtained in separate simulations with only one of<br>
> the sources?<br>
><br>
> Any suggestions?<br>
><br>
> Regards,<br>
> Débora<br>
><br>
> Debora Salvado, MSc<br>
> PhD Student<br>
> University College London<br>
> INM, UCLH, (T-5) 235 Euston Road<br>
> London NW1 2BU<br>
> UK<br>
><br>
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</blockquote></div><br></div>