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<p>Yes right, sorry !</p>
<p>Simon<br>
</p>
<p><br>
</p>
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<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>De :</b> Castor-users <castor-users-bounces@lists.castor-project.org> de la part de tmerlin <Thibaut.Merlin@univ-brest.fr><br>
<b>Envoyé :</b> lundi 20 janvier 2020 15:22<br>
<b>À :</b> castor-users@lists.castor-project.org<br>
<b>Objet :</b> Re: [Castor-users] Attenuation correction for PET image</font>
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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>
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<div class="moz-cite-prefix">On 20/01/2020 10:27, STUTE Simon wrote:<br>
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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>
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<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>
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<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>
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<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)">dusrud026@gmail.com</a></font></p>
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<pre class="moz-quote-pre">_______________________________________________
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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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