<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
<meta name="Generator" content="Microsoft Word 15 (filtered medium)">
<!--[if !mso]><style>v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
w\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
</style><![endif]--><style><!--
/* Font Definitions */
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri",sans-serif;
mso-fareast-language:EN-US;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:#0563C1;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:#954F72;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Calibri",sans-serif;
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;
font-family:"Calibri",sans-serif;
mso-fareast-language:EN-US;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:72.0pt 72.0pt 72.0pt 72.0pt;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang="EN-GB" link="#0563C1" vlink="#954F72">
<div class="WordSection1">
<p class="MsoNormal">Hi everyone<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">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"><o:p> </o:p></p>
<p class="MsoNormal">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"><o:p> </o:p></p>
<p class="MsoNormal">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"><o:p> </o:p></p>
<p class="MsoNormal">Does anyone have any clues or suggests are to where to look to troubleshoot this?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thank you<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b><span style="color:#006871;mso-fareast-language:EN-GB">Mark Baker<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="color:#006871;mso-fareast-language:EN-GB">Principal Clinical Scientist (Interim)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#006871;mso-fareast-language:EN-GB">Imaging Physics (Ionising)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#006871;mso-fareast-language:EN-GB">The Clatterbridge Cancer Centre NHS Foundation Trust<o:p></o:p></span></p>
<p class="MsoNormal"><i><span style="color:#006871;mso-fareast-language:EN-GB">(he, him)<o:p></o:p></span></i></p>
<p class="MsoNormal"><b><span style="color:#006871;mso-fareast-language:EN-GB"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><span style="color:#006871;mso-fareast-language:EN-GB">CCCW Tel: 0151 556 5030
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#006871;mso-fareast-language:EN-GB">CCCL Tel: 0151 318 8438<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#006871;mso-fareast-language:EN-GB">Email:
</span><span style="color:#4472C4;mso-fareast-language:EN-GB"><a href="mailto:mark.baker23@nhs.net"><span style="color:#4472C4">mark.baker23@nhs.net</span></a></span><span style="color:#006871;mso-fareast-language:EN-GB">
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#4472C4;mso-fareast-language:EN-GB"><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>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB"> <span style="color:#006871"><o:p></o:p></span></span></p>
<p class="MsoNormal"><i><span style="color:#006871;mso-fareast-language:EN-GB">Honorary Lecturer, Dept. of Physics<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="color:#006871;mso-fareast-language:EN-GB">University of Liverpool<o:p></o:p></span></i></p>
<p class="MsoNormal"><span style="color:#006871;mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB"><img border="0" width="624" height="163" style="width:6.5in;height:1.6979in" id="Picture_x0020_3" src="cid:image003.jpg@01D7E794.A09B0910" alt="CCC email footer April 2021"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<br>
<font face="Courier New" color="Black" size="2"><br>
************************************************************************************** ******************************<br>
<br>
This message may contain confidential information. If you are not the intended recipient please:<br>
i) inform the sender that you have received the message in error before deleting it; and
<br>
ii) do not disclose, copy or distribute information in this e-mail or take any action in relation to its content (to do so is strictly prohibited and may be unlawful).
<br>
Thank you for your co-operation.<br>
<br>
NHSmail is the secure email, collaboration and directory service available for all NHS staff in England. NHSmail is approved for exchanging patient data and other sensitive information with NHSmail and other accredited email services.<br>
<br>
For more information and to find out how you can switch visit <a href="https://support.nhs.net/article-categories/joining-nhsmail/">
Joining NHSmail – NHSmail Support</a><br>
<br>
</font>
</body>
</html>