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Hi Ane, thank you so much, that makes perfect sense now.<br>
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Cheers<br>
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Josh<br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Ane Etxebeste <ane.etxebeste@creatis.insa-lyon.fr><br>
<b>Sent:</b> Friday, September 3, 2021 8:15:26 AM<br>
<b>To:</b> Josh Knowland <jknowland@lucernodynamics.com>; gate-users@lists.opengatecollaboration.org <gate-users@lists.opengatecollaboration.org><br>
<b>Subject:</b> Re: [Gate-users] getting detector volume ID from hits?</font>
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<p>Hi Josh,</p>
<p>VolumeID array represents the ID of the volume in which the hit occurred.<br>
</p>
<p>Each position in the array gives you the volume ID at a specific hierarchy level.</p>
<p>Let's say that you have an scanner made of two heads and each head is composed of 64 pixelated crystals.</p>
<p>The ID of the detector head goes from 0 to 1, whereas the ID at pixel level goes from 0 to 63.</p>
<p>In this case, in order to identify the volume where the hit occurred you will need this two values of the array.</p>
<p>If you have a single detector head, the ID at pixel level will be enough to identify the volume.<br>
</p>
<p>I hope it helps.</p>
<p>Regards,</p>
<p>Ane</p>
<div class="x_moz-cite-prefix">On 01/09/2021 23:19, Josh Knowland wrote:<br>
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<p class="x_MsoNormal">Hello GATE experts,</p>
<p class="x_MsoNormal"> </p>
<p class="x_MsoNormal">Can you help me get the volume ID where hits occurred from the root file?</p>
<p class="x_MsoNormal">I have been able to export the hits tree to a text file using scan(“*”). I’ve attached a sample of the first 10 events in the text file.</p>
<p class="x_MsoNormal"> </p>
<p class="x_MsoNormal">I can tell that the VolumeID branch holds an array for each event. The arrays are 10 elements and must indicate somehow the detector volume in which the hit occurred.</p>
<p class="x_MsoNormal"> </p>
<p class="x_MsoNormal">Really, the only information I need for each hit is:</p>
<ol type="1" start="1" style="margin-top:0in">
<li class="x_MsoListParagraph" style="margin-left:0in">ProcessName</li><li class="x_MsoListParagraph" style="margin-left:0in">PDGEncoding</li><li class="x_MsoListParagraph" style="margin-left:0in">edep</li><li class="x_MsoListParagraph" style="margin-left:0in">posX, posY, posZ</li><li class="x_MsoListParagraph" style="margin-left:0in">sourceID</li><li class="x_MsoListParagraph" style="margin-left:0in">sourcePosX, sourcePosY, sourcePosZ</li><li class="x_MsoListParagraph" style="margin-left:0in">[the ID of the volume in which the hit occurred]</li></ol>
<p class="x_MsoNormal"> </p>
<p class="x_MsoNormal">Ideally, I need to output the tree as a text file like the attached one. To reduce file size, I’d like to have only one line per event instead of the 10 lines it’s writing now.</p>
<p class="x_MsoNormal"> </p>
<p class="x_MsoNormal">Can you help me understand this?</p>
<p class="x_MsoNormal"> </p>
<p class="x_MsoNormal">Thanks,</p>
<p class="x_MsoNormal">Josh</p>
<p class="x_MsoNormal"> </p>
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