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<p>Hi <span class="il">Yeonkyeong,</span></p>
<div class="moz-cite-prefix">On 21/01/2020 11:31, 김연경 wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CA+f9Ky82gBhaFjiCL=1a=qYTfw_M1uXGejSM+Og4NyqaK8jxnw@mail.gmail.com">
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<div dir="ltr"><font face="arial, sans-serif" color="#000000">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>
</font></div>
</blockquote>
<p>Using the -t option, only the true coincidences will be converted
to your CASToR datafile.</p>
<blockquote type="cite"
cite="mid:CA+f9Ky82gBhaFjiCL=1a=qYTfw_M1uXGejSM+Og4NyqaK8jxnw@mail.gmail.com">
<div dir="ltr"><font face="arial, sans-serif" color="#000000"><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>
</blockquote>
<p>I am not sure what you mean by damp (damping ?) factor. Perhaps
could you cite a paper which refers to it ?<br>
</p>
<blockquote type="cite"
cite="mid:CA+f9Ky82gBhaFjiCL=1a=qYTfw_M1uXGejSM+Og4NyqaK8jxnw@mail.gmail.com">
<div dir="ltr">
<div><font face="arial, sans-serif" color="#000000"><br>
</font></div>
<div><font face="arial, sans-serif" color="#000000">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 face="arial, sans-serif" color="#000000">I used the
commands written below. </font></div>
<div><font face="arial, sans-serif" color="#000000">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>
</font></div>
</div>
</blockquote>
<p>Unfortunately you can't. The TOF options in <font face="arial,
sans-serif" color="#000000">the <i>castor-GATERootToCastor</i>
converter are only available with list-mode output.<br>
</font></p>
<p><font face="arial, sans-serif" color="#000000">Best,<br>
Thibaut<br>
</font></p>
<p><br>
</p>
<blockquote type="cite"
cite="mid:CA+f9Ky82gBhaFjiCL=1a=qYTfw_M1uXGejSM+Og4NyqaK8jxnw@mail.gmail.com">
<div dir="ltr">
<div><font face="arial, sans-serif" color="#000000">Any help I
would really appreciate it. <br>
<br>
Best regards<br>
</font><br>
</div>
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<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"
moz-do-not-send="true">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" moz-do-not-send="true"><castor-users-bounces@lists.castor-project.org></a>
de la part de 김연경 <a
href="mailto:dusrud026@gmail.com" target="_blank"
moz-do-not-send="true"><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" moz-do-not-send="true">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>
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<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"
moz-do-not-send="true">dusrud026@gmail.com</a></font></p>
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<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)
12 Avenue Foch, 29200 Brest, FRANCE
Tel: 06.75.12.24.90</pre>
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-- <br>
<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"
style="color:rgb(17,85,204)" target="_blank"
moz-do-not-send="true">dusrud026@gmail.com</a></font></p>
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</blockquote>
<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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