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<p>Hi,</p>
<p><br>
</p>
<p>Just to add to Simon's answer:</p>
<p><br>
</p>
<p>If you only recovered true coincidences from the GATE simulation
data, and if you are using list-mode data, then with the -atn
option you can provide an (interfile) image containing the
attenuation coefficient value (in cm-1) to correct for attenuation
during reconstruction. Attenuation correction factors will be used
as multiplicative correction factors during the computation of the
sensitivity image (which is calculated first when you launch the
reconstruction), so the sensitivity image will include correction
for attenuation. <br>
</p>
<p><br>
</p>
<p>Best,<br>
</p>
<p>Thibaut<br>
</p>
<p><br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 20/01/2020 10:27, STUTE Simon wrote:<br>
</div>
<blockquote type="cite" cite="mid:1579512422242.45416@chu-nantes.fr">
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<p>Hi,</p>
<p><br>
</p>
<p>I may be wrong but Chang's method is for SPECT.</p>
<p><br>
</p>
<p>For PET, you have to compute the attenuation correction factor
for each event also, and add this information in the datafile.<br>
</p>
<p><br>
</p>
<p>Simon</p>
<p><br>
</p>
<div style="color: rgb(33, 33, 33);">
<hr tabindex="-1" style="display:inline-block; width:98%">
<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt"
face="Calibri, sans-serif" color="#000000"><b>De :</b>
Castor-users
<a class="moz-txt-link-rfc2396E" href="mailto:castor-users-bounces@lists.castor-project.org"><castor-users-bounces@lists.castor-project.org></a> de la
part de 김연경 <a class="moz-txt-link-rfc2396E" href="mailto:dusrud026@gmail.com"><dusrud026@gmail.com></a><br>
<b>Envoyé :</b> lundi 20 janvier 2020 09:43<br>
<b>À :</b> <a class="moz-txt-link-abbreviated" href="mailto:castor-users@lists.castor-project.org">castor-users@lists.castor-project.org</a>; Thibaut
Merlin<br>
<b>Cc :</b> Yong Choi<br>
<b>Objet :</b> [Castor-users] Attenuation correction for PET
image</font>
<div> </div>
</div>
<div>
<div dir="ltr"><font face="arial, sans-serif" color="#000000">Dear
CASToR users<br>
<br>
I obtained the image of the GATE simulation data using the
castor program. <br>
<br>
</font>
<div><font face="arial, sans-serif" color="#000000">I would
like to ask the confusing part of applying the
attenuation correction to the acquired image. The data
is list mode.<br>
<br>
</font></div>
<div><font face="arial, sans-serif" color="#000000">if I
enter the same image as the phantom size with
attenuation coefficient value into the -atn option, will
the attenuation factor be calculated within the caster
program's code and corrected for the image?<br>
<br>
</font></div>
<div><font face="arial, sans-serif" color="#000000">If the
method described above is correct, does the program use
the method of Chang's multiplicative?<br>
<br>
</font></div>
<div><font face="arial, sans-serif" color="#000000">Any help
I would really appreciate it.
<br>
<br>
Best regards<br>
--</font>
<div dir="ltr" class="gmail_signature">
<div dir="ltr">
<div>
<div dir="ltr">
<div>
<div dir="ltr">
<p><font face="tahoma, sans-serif"
color="#666666">YEONKYEONG KIM</font></p>
<p><font face="tahoma,sans-serif"
color="#666666">Molecular Imaging
Research&Education Laboratory (MIRE
Lab)<br>
Department of Electronic
Engineering,Sogang University</font></p>
<p><font face="tahoma,sans-serif"
color="#666666">803, Ricci Hall(R 803),
Sogang University<br>
35 Baekbeom-ro, Mapo-gu, Seoul, South
Korea 04107<br>
Mobile : +82-10-9996-3644<br>
Email : <a
href="mailto:dusrud026@gmail.com"
target="_blank"
style="color:rgb(17,85,204)"
moz-do-not-send="true">dusrud026@gmail.com</a></font></p>
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<br>
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<pre class="moz-quote-pre" wrap="">_______________________________________________
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<pre class="moz-signature" cols="72">--
Thibaut MERLIN -- PhD
Docteur en Imagerie Médicale au Laboratoire de Traitement de l'Information Medicale (LaTIM - INSERM UMR 1101)
Institut Brestois de recherche en Bio-Santé (IBRBS)
12 Avenue Foch, 29200 Brest, FRANCE
Tel: 06.75.12.24.90</pre>
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