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<p>Hi,</p>
<p>You must provide an image containing, for each voxel, the
attenuation coefficient value related to your object.</p>
<p>If you used voxelized phantoms in your GATE simulation
(source/phantom definition), you must provide a similar image with
<span class="st">511-keV<em> </em></span>(for PET) attenuation
coefficients for each voxels. If you use a geometric
phantom/object geometry, you must generate this image.<br>
</p>
<p>On a side note, it is not mandatory to use an attenuation image
with the same voxel size/number of the reconstruction image matrix
though. The attenuation image will be interpolated if the image
matrices are different.<br>
</p>
<p>Hope this helps,<br>
Thibaut</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 22/01/2020 02:32, 김연경 wrote:<br>
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cite="mid:CA+f9Ky8SMJUN_wHkfPSG+4sW-f2ZSDgcP26mmiEUqr3=u+UrLg@mail.gmail.com">
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<div dir="ltr">Dear Thibaut<br>
<br>
Hi!<br>
<br>
Thank you for your answer.<br>
Sorry, The damping factor in Q2 is the wrong attenuation
factor. So, I wrote the question again below.<br>
<br>
Q1. If you provide an image filled with only 'attenuation
coefficient value' after '-atn', is it right for the CASToR
program to calculate the 'attenuation factor' according to the
distance or position within the phantom?<br>
Or do I have to provide an image that included
calculated attenuation factors for each position of the
phantom?<br>
<br>
<br>
Best regard</div>
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-- <br>
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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"
style="color:rgb(17,85,204)" target="_blank"
moz-do-not-send="true">dusrud026@gmail.com</a></font></p>
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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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