<div dir="ltr">Dear Thibaut Merlin,<div><br></div><div>Thank you for your quick response. <br></div><div>Successfully, I made the attenuation image. Then, I made **.cdh and **.cdf with attenuaton correrction using castor-GATERootToCastor (This is list-mode format for reconstructing with scatter and random correction). <br></div><div><br></div><div>When I run castor-recon, the message below was displayed.</div><div><br></div><div><b>***** oSensitivityGenerator::InitializeAttenuationFiles() -> Attenuation correction is included in the data file while it is not in the sensitivity computation !<br>***** oSensitivityGenerator::Initialize() -> A problem occurred while initializing the attenuation files !<br>***** castor-recon() -> A problem occurred while initializing the sensitivity generator !<br></b></div><div><br></div><div>I know that the attenuation image MUST be providen to the castor-recon exe as well, in order to perform sensitivity image computation for PET list-mode. How should I provide attenuation image to reconstruct the data?<br></div><div><br></div><div>Thank you in advance.</div><div>Best regards,</div><div><br></div><div>Suguru</div><div><br></div><div class="gmail_quote"><div dir="ltr" class="gmail_attr">2020年6月30日(火) 0:00 tmerlin <<a href="mailto:Thibaut.Merlin@univ-brest.fr" target="_blank">Thibaut.Merlin@univ-brest.fr</a>>:<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 Suguru,</p>
<p>Attenuation image must be in interfile format, and must be in
cm-1. The dimensions/voxel sizes will be interpolated to the
reconstruction image dimensions, so you don't need to provide an
image with the exact same dimensions than for the reconstruction.
Additionally, you should make sure that the reconstruction image
dimensions are large enough to include all attenuated materials of
the attenuation image, otherwise the attenuation correction will
be incorrect. </p>
<p>Regarding the image itself, you should generate it from the
geometry of the phantom you use in the GATE simulation, or derive
it directly from the phantom image if you used a voxelized
phantom.</p>
<p>Hope this helps,</p>
<p>Thibaut<br>
</p>
<p><br>
</p>
<div>On 29/06/2020 09:57, Suguru Katsube
wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">Hi all,
<div><br>
</div>
<div>I am trying to reconstruct a GATE root file (PET).<br>
I want to apply attenuation correction and reconstruct it. The
manual states I need an attenuation image, how do I create it
? The phantom was designed on a GATE and no CT images were
acquired. There are many unclear points such as image format,
number of pixels, number of slices, alignment, etc. Can I
create the attenuation image using a root file or mac file?</div>
<div><br>
Any advice is appreciated.<br clear="all">
<div><br>
</div>
<div>Best regards, </div>
<div><br>
</div>
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<div><font face="arial, sans-serif"> 勝部 俊（Suguru
Katsube）</font></div>
<div>
<p style="margin:0px;line-height:normal"><font face="arial, sans-serif"><font color="#000000"> 九州大学大学院</font><span style="color:rgb(0,0,0)">医学系学府保健学専攻</span></font></p>
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Quantum Radiation Science Course<span style="line-height:normal">,</span></font></p>
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of Health Sciences<span style="line-height:normal">,</span></font></p>
<p style="margin:0px;line-height:normal"><font face="arial, sans-serif" color="#000000"> Graduate
School of Medical Sciences<span style="line-height:normal">,</span> </font></p>
<p style="margin:0px;line-height:normal"><font face="arial, sans-serif" color="#000000"> Kyushu
University<span style="line-height:normal">,</span> Fukuoka<span style="line-height:normal">,</span> Japan</font></p>
<p style="margin:0px;line-height:normal"><font face="arial, sans-serif"><font color="#000000"> E-mail: </font><a href="mailto:E-mail%3Aymmk88kmmy@gmail.com" style="color:rgb(17,85,204)" target="_blank">sug.katsu@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)
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</blockquote></div></div><br clear="all"><div><br></div>-- <br><div dir="ltr"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><font face="arial, sans-serif">○●----------------------------------------------------------●○</font></div><div><font face="arial, sans-serif"> 勝部 俊（Suguru Katsube）</font></div><div><p style="margin:0px;line-height:normal"><font face="arial, sans-serif"><font color="#000000"> 九州大学大学院</font><span style="color:rgb(0,0,0)">医学系学府保健学専攻</span></font></p><p style="margin:0px;line-height:normal"><font face="arial, sans-serif" color="#000000"> 医用量子線科学分野 修士課程2年</font></p><p style="margin:0px;line-height:normal;min-height:14px"><font face="arial, sans-serif" color="#000000"><br></font></p><p style="margin:0px;line-height:normal"><font face="arial, sans-serif" color="#000000"> Medical Quantum Radiation Science Course<span style="line-height:normal">,</span></font></p><p style="margin:0px;line-height:normal"><font face="arial, sans-serif" color="#000000"> Department of Health Sciences<span style="line-height:normal">,</span></font></p><p style="margin:0px;line-height:normal"><font face="arial, sans-serif" color="#000000"> Graduate School of Medical Sciences<span style="line-height:normal">,</span> </font></p><p style="margin:0px;line-height:normal"><font face="arial, sans-serif" color="#000000"> Kyushu University<span style="line-height:normal">,</span> Fukuoka<span style="line-height:normal">,</span> Japan</font></p><p style="margin:0px;line-height:normal"><font face="arial, sans-serif"><font color="#000000"> E-mail: </font><a href="mailto:E-mail%3Aymmk88kmmy@gmail.com" style="color:rgb(17,85,204)" target="_blank">sug.katsu@gmail.com</a></font></p></div><div><font face="arial, sans-serif">○●----------------------------------------------------------●○</font></div></div></div></div></div></div></div></div></div>