<div dir="ltr"><font color="#000000" face="arial, sans-serif">Dear Thibaut,<br><br>Thank you for your answer.<br>But, I didn't fully understand your answer. So, I have additional questions for you.<br><br>Q1. what does mean of 'only recovered true coincidences for GATE simulation data'?<br>When converting(GATERootToCastor) data, is it possible to correct only the data obtained by applying the '-t' option?<br><br>Q2. If you provide an image filled with only 'attenuation coefficient value' after '-atn', is it right for the CASToR program to calculate the 'damp factor' according to the distance or position of the phantom?<br>Or do I have to provide an image that included calculated attenuation factors for each position of the phantom?</font><div><font color="#000000" face="arial, sans-serif"><br></font></div><div><font color="#000000" face="arial, sans-serif">Q3. When the simulation data is converted to histogram mode, the Cdh file does not show TOF flags or Histo TOF bin size. What additional options should I use?</font></div><div><font color="#000000" face="arial, sans-serif">I used the commands written below. </font></div><div><font color="#000000" face="arial, sans-serif">castor-GATERootToCastor -m TOF_257_t10_jas2_uniform.mac -s TOF_t10_uniform -i 200116_TOF_t10_uniform_120s.root -o 200120_TOF_t10_uniform_hist_vb_tof -TOF_reso 180 -vb 4 -oh<br><br>Any help I would really appreciate it. <br><br>Best regards<br></font><br></div><img width="0" height="0" class="mailtrack-img" alt="" style="display:flex" src="https://mailtrack.io/trace/mail/b1d776705ea3b439e8bba86fd5fac81dd1448c4b.png?u=5192502"></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">2020년 1월 20일 (월) 오후 11:23, tmerlin <<a href="mailto:Thibaut.Merlin@univ-brest.fr">Thibaut.Merlin@univ-brest.fr</a>>님이 작성:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
<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>On 20/01/2020 10:27, STUTE Simon wrote:<br>
</div>
<blockquote type="cite">
<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 style="display:inline-block;width:98%">
<div id="gmail-m_-6678468654227810097divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>De :</b>
Castor-users
<a href="mailto:castor-users-bounces@lists.castor-project.org" target="_blank"><castor-users-bounces@lists.castor-project.org></a> de la
part de 김연경 <a href="mailto:dusrud026@gmail.com" target="_blank"><dusrud026@gmail.com></a><br>
<b>Envoyé :</b> lundi 20 janvier 2020 09:43<br>
<b>À :</b> <a href="mailto:castor-users@lists.castor-project.org" target="_blank">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">
<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" style="color:rgb(17,85,204)" target="_blank">dusrud026@gmail.com</a></font></p>
</div>
</div>
</div>
</div>
</div>
</div>
<br>
</div>
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</blockquote>
<pre 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)
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</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><p><font color="#666666" face="tahoma, sans-serif">YEONKYEONG KIM</font></p><p><font color="#666666" face="tahoma,sans-serif">Molecular Imaging Research&Education Laboratory (MIRE Lab)<br>Department of Electronic Engineering,Sogang University</font></p><p><font color="#666666" face="tahoma,sans-serif">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" style="color:rgb(17,85,204)" target="_blank">dusrud026@gmail.com</a></font></p></div></div></div></div></div></div>