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<div class="">Dear GATE-Users,</div>
<div class=""><br class="">
</div>
<div class="">the eMail attached I received from Marcin Balcerzyk,</div>
<div class="">because he could not send it to the Gate-users List.</div>
<div class="">Maybe this is caused by the fact that he used a different</div>
<div class="">eMail address before, that from an earlier affiliation.</div>
<div class="">Please let me know, if somebody knows how to address this</div>
<div class="">issue.</div>
<div class="">Also, if you can help him and give advice, please respond</div>
<div class="">to his eMail (in Cc:) and also to the gate-users list</div>
<div class=""><br class="">
</div>
<div class="">Many thanks and kind regards,</div>
<div class=""><br class="">
</div>
<div class="">Uwe Pietrzyk</div>
<br class="">
<div class="">
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/----------------------------------------------------------------------<br class="">
Prof. Dr. Uwe Pietrzyk<br class="">
Diplom-Physiker<br class="">
<br class="">
eMail: <a href="mailto:U.Pietrzyk@fz-juelich.de" class="">U.Pietrzyk@fz-juelich.de</a><br class="">
eMail: <a href="mailto:Uwe.Pietrzyk@web.de" class="">Uwe.Pietrzyk@web.de</a><br class="">
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/----------------------------------------------------------------------<br class="">
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<div class="">Begin forwarded message:</div>
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<span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(0, 0, 0, 1.0);" class=""><b class="">From:
</b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;" class="">Marcin Balcerzyk <<a href="mailto:mbalcerzyk@us.es" class="">mbalcerzyk@us.es</a>><br class="">
</span></div>
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<span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(0, 0, 0, 1.0);" class=""><b class="">Subject:
</b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;" class=""><b class="">hits.dat Gate question</b><br class="">
</span></div>
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<span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(0, 0, 0, 1.0);" class=""><b class="">Date:
</b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;" class="">18. July 2018 at 15:33:00 GMT+2<br class="">
</span></div>
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<span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(0, 0, 0, 1.0);" class=""><b class="">To:
</b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;" class=""><<a href="mailto:u.pietrzyk@fz-juelich.de" class="">u.pietrzyk@fz-juelich.de</a>><br class="">
</span></div>
<br class="">
<div class="">
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<span lang="ES" class="">Dear Uwe.<o:p class=""></o:p></span></div>
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<span lang="ES" class=""><o:p class=""> </o:p></span></div>
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I subscribe to Gate mailing list but due to various changes in university emails, somehow I cannot post it to the list using my email of<span class="Apple-converted-space"> </span><a href="mailto:mbalcerz@ucm.es" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">mbalcerz@ucm.es</a><span class="Apple-converted-space"> </span>(previously<span class="Apple-converted-space"> </span><a href="mailto:mbalcerz@pluri.ucm.es" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">mbalcerz@pluri.ucm.es</a>).
I asked the list administrator to fix it, subscribed from my current University of Seville, but there is no answer and I still cannot post. If you are the list administrator, could you fix it? If not, let me ask you the question anyway.<span class="Apple-converted-space"> </span><o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
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On<span class="Apple-converted-space"> </span><a href="http://www.opengatecollaboration.org/UsersGuide" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">http://www.opengatecollaboration.org/UsersGuide</a><span class="Apple-converted-space"> </span>you
are listed as a person compiling User´s Guide for Gate, so I hope I am asking the right person. In 2009 I did an Albira preclinical PET 3 ring scanner simulation with Gate 3 which was working fine, giving correct results that led to publication. So I have
confidence in the way the simulation is built. I transferred it then to vGate 1.0 (Gate 6.0.1) in 2010 and did adaptation. It also worked fine. Now I wanted to do some serious research again and use Gate, now using information which comes out of hits.dat file.
I read the description of columns: N+8, N+9, N+10 XYZ position of the hit and some other columns in hits.dat.<o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
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All output below comes from Gate 6.0.1 (vGate 1.0). Below is the example photoelectric hit list for the crystal containing lutetium (K line at 63.3 keV). I have a problem interpreting the data (in the image of the table below), namely:<o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
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<img border="0" id="Picture_x0020_1" style="" class="" apple-inline="yes" src="cid:image002.png@01D41EAC.9BB9A4B0"><o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
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<li class="MsoListParagraph" style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
What does really stepLength correspond to? Here it is the distance between (posX, posY, posZ) between two rows. Such a long one should be the energetic electron emitted in PhotoElectric effect, yet particleType is 22 which is photons. So particleType is the
type of particle entering i.e. causing the hit?<o:p class=""></o:p></li><li class="MsoListParagraph" style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
Why the ID of the particle is 5 and there is no 3 nor 4 in the hit history? This event did not generate a coincidence and only a single. Can it be that the other single did not reach the energy threshold?<o:p class=""></o:p></li></ol>
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<o:p class=""> </o:p></div>
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The next hit list is from a Compton event in the crystal detector from the positron annihilation at point (0.0506, -6.086, -6.136):<o:p class=""></o:p></div>
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<img border="0" id="Picture_x0020_3" style="" class="" apple-inline="yes" src="cid:image006.png@01D41EAC.9BB9A4B0"><o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
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Here is a drawing in Origin 2018 with the IDParticle as a label. A distant point before label 2 is annihilation, about 75 mm away, so you look along the 511 keV gamma arriving at crystal:<o:p class=""></o:p></div>
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<img border="0" id="Picture_x0020_4" style="" class="" apple-inline="yes" src="cid:image009.jpg@01D41EAC.9BB9A4B0"><o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
<ol start="3" type="1" style="margin-bottom: 0cm; margin-top: 0cm;" class="">
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Here starts my problem connecting hits with length, positions and angles. I understand that here the first row is listing in (posX, posY, posY) the location of Compton scatter (labelled small 2). Then the stepLength of 6.445 mm is the length of scattered photon
path to the next hit – PhotoElectric event in row 2 . This hit did not have any Rayleigh nor Compton scatter in the phantom before reaching the detector. Yet when you calculate Compton scattered angle of the photon it is almost zero, not the one expected from
Compton scattering. How come? Is GEANT4 not simulating Compton events and scattering angles correctly? The scattered electron is the one with 0.262 MeV energy and step length of 0.11 mm?<o:p class=""></o:p></li><li class="MsoListParagraph" style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
I do not know what the stepLength of 4.953 mm with PhotoElectric hit corresponds to. In the material of my detector, the radiation length for 63.3 keV photon is 0.32 mm. So is 4.953 mm corresponding to the distance of emitted electron? It seems too long a distance
for a 0.181 MeV electron, if in previous interaction with 0.262 MeV it was 0.11 mm?<o:p class=""></o:p></li><li class="MsoListParagraph" style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
Maybe you can send me a history of some single hit with a Compton in the detector without a Compton in the phantom and annihilation position to make sure I have no problem with my scanner macro?<o:p class=""></o:p></li><li class="MsoListParagraph" style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
The last question is independent of the previous: is there a way to get a hit data (especially hit position and energy lost) for the gammas in a PET scanner that are scattered in the phantom? Shall I execute attachCrystalSD on the phantom as you seem to suggest
on the page<span class="Apple-converted-space"> </span><a href="http://wiki.opengatecollaboration.org/index.php/Users_Guide:Attaching_the_sensitive_detectors" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">http://wiki.opengatecollaboration.org/index.php/Users_Guide:Attaching_the_sensitive_detectors</a><span class="Apple-converted-space"> </span>?
If so, where the hit data would be stored – in hit.dat or in a corresponding root file (I have both ascii and root enabled)? My phantom is not a voxelized one.<o:p class=""></o:p></li></ol>
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<o:p class=""> </o:p></div>
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Thank you for your patience. I would post it to the list, but I have no access.<span class="Apple-converted-space"> </span><o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
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Kind regards<o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span lang="ES" class="">Marcin Balcerzyk, Ph.D.<br class="">
Unidad Ciclotrón,<o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span lang="ES" class="">Centro Nacional de Aceleradores,<o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span lang="ES" class="">Universidad de Sevilla-CSIC-Junta de Andalucía,<o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span lang="ES" class="">Parque Tecnológico Cartuja 93,<span class="Apple-converted-space"> </span><o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span lang="ES" class="">c/Thomas Alva Edison Nº 7,<span class="Apple-converted-space"> </span><o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span lang="ES" class="">Tel.: (+34) 954 460 553 ext. 236,<span class="Apple-converted-space"> </span><br class="">
Fax: (+34) 954 460 145,<br class="">
mobile:(+34) 697 322 126<br class="">
Skype: balcerzm</span></div>
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