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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Hi David<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Sorry for the delay in responding. I’m away from my machine at the moment, but I will try a single core tomorrow. However, the images
showed these effects on the root files of the individual cores (i.e. before they were merged) and I think this would be the same as running a single core (to my limited knowledge). I will do one to confirm however.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Thank you<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#006871">Mark Baker<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#006871">Principal Clinical Scientist (Interim)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#006871">Imaging Physics (Ionising)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#006871">The Clatterbridge Cancer Centre NHS Foundation Trust<o:p></o:p></span></p>
<p class="MsoNormal"><i><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#006871">(he, him)<o:p></o:p></span></i></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#006871"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#006871">CCCW Tel: 0151 556 5030
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#006871">CCCL Tel: 0151 318 8438<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#006871">Email:
</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#4472C4"><a href="mailto:mark.baker23@nhs.net"><span style="color:#4472C4">mark.baker23@nhs.net</span></a></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#006871">
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#4472C4"><a href="https://teams.microsoft.com/l/chat/0/0?users=mark.baker23@nhs.net"><span style="color:#4472C4">Microsoft Teams (click here)</span></a><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> David Sarrut <david.sarrut@creatis.insa-lyon.fr>
<br>
<b>Sent:</b> 07 December 2021 07:15<br>
<b>To:</b> BAKER, Mark (THE CLATTERBRIDGE CANCER CENTRE NHS FOUNDATION TRUST) <mark.baker23@nhs.net><br>
<b>Cc:</b> gate-users@lists.opengatecollaboration.org<br>
<b>Subject:</b> Re: [Gate-users] Weird Blips in F18 data<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hello Mark, <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">can you try with a single core (no merging), even with a "low" statistics, to see if it also occurs ? <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">thanks<o:p></o:p></p>
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<p class="MsoNormal">David<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Thu, Dec 2, 2021 at 4:52 PM BAKER, Mark (THE CLATTERBRIDGE CANCER CENTRE NHS FOUNDATION TRUST) <<a href="mailto:mark.baker23@nhs.net">mark.baker23@nhs.net</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Hi everyone<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I’m running a relatively simple simulation of a NEMA IQ phantom, looking at the dose deposited within it by F18. My sim has a CT scan loaded as the geometry (with HU determined
from the StoichHU example) and the F18 scan as the source. Physics are loaded as GQSP_BERT_EMV. The macro is split into 4 to run on 4 separate cores, then merged together afterwards using hadd for the root files. My source definition is Fluor18 with e+ particle,
6585s setforcedhalflife and true for setforcedunstableflag (unfortunately my code is on a different machine to my emails so I can’t cope and paste directly).
<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I’m getting some interesting results in my tracklength and edepspectrum root files (see attached). The tracklength seems to get a little bit of a blip at pretty much 1mm, which
I’m finding hard to explain. Additionally, on the Edep there appears to be an event (or possibly several) which deposits 20GeV from an energy of around 0.5MeV. The reason that I think it might be several events is that the same point is visible on the individual
root files as well as the merged file. My actual edep and dose images look pretty good.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">These examples are from merged root files from 4x25000 events so probably not amazing statistically but are quick enough for me to run and trouble shoot. I’ve ran slightly more
events and still see the same effects, but I will run a longer simulation (4x200M or something) overnight to see if I get the same effects (and rule out a statistics related issue).<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Does anyone have any clues or suggests are to where to look to troubleshoot this?<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Thank you<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="color:#006871">Mark Baker</span></b><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#006871">Principal Clinical Scientist (Interim)</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#006871">Imaging Physics (Ionising)</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#006871">The Clatterbridge Cancer Centre NHS Foundation Trust</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><i><span style="color:#006871">(he, him)</span></i><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="color:#006871"> </span></b><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#006871">CCCW Tel: 0151 556 5030
</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#006871">CCCL Tel: 0151 318 8438</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#006871">Email:
</span><span style="color:#4472C4"><a href="mailto:mark.baker23@nhs.net">mark.baker23@nhs.net</a></span><span style="color:#006871">
</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#4472C4">Microsoft Teams (click here)</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><i><span style="color:#006871">Honorary Lecturer, Dept. of Physics</span></i><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><i><span style="color:#006871">University of Liverpool</span></i><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#006871"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><br>
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<p class="MsoNormal">-- <o:p></o:p></p>
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<p class="MsoNormal"><span style="color:black">David Sarrut, Phd</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="color:black">Directeur de recherche CNRS</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="color:black"> "2 + 2 = 5, for extremely large values of 2"</span><o:p></o:p></p>
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