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<p>Hi Reza,</p>
<p><br>
</p>
<p>I will backtrack from my previous mail. Contrary to what I
previously stated, YES, for the moment you have to provide both an
attenuation image and acf for each events for list-mode
attenuation correction in the release version of CASToR.. This
will no longer be the case in the next release.</p>
<p><br>
</p>
<p>Sorry for any confusion :)<br>
</p>
<p>Thibaut</p>
<p><br>
</p>
<br>
<div class="moz-cite-prefix">On 04/05/2017 15:49, tmerlin wrote:<br>
</div>
<blockquote
cite="mid:69b9c2c2-dc9b-10b3-ec76-f490fb071216@univ-brest.fr"
type="cite">
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<p>Hi,</p>
<p><br>
</p>
<p>To add to Simon answer, if you have an attenuation image, there
is no need to compute acf for each event in list-mode
reconstruction. Attenuation correction will be computed from the
attenuation image during the sensitivity image generation.<br>
</p>
<p>Also, in the event of the dimensions of reconstructed image do
not match those of the atn image, make sure that the whole atn
image is contained in the reconstruction FOV, as the atn image
will be interpolated to the reconstruction dimensions before
generating the sensitivity image.</p>
<p><br>
</p>
<p>Regards,</p>
<p>Thibaut</p>
<p><br>
</p>
<br>
<div class="moz-cite-prefix">On 04/05/2017 14:05, STUTE Simon
wrote:<br>
</div>
<blockquote
cite="mid:64F557D0ED899A4D9BAC0FFD0CBEC7832944EA19@EXDAG0-B2.intra.cea.fr"
type="cite">
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<p>Hi Reza,</p>
<p> </p>
<p>This is a good point but we did not have time yet to
implement it. This feature will be provided in the next
release.</p>
<p> </p>
<p>Cheers</p>
<p>Simon</p>
<p> </p>
<hr tabindex="-1">
<div id="divRpF565864" style="direction: ltr;"><font
color="#000000" face="Tahoma" size="2"><b>De :</b>
Castor-users [<a moz-do-not-send="true"
class="moz-txt-link-abbreviated"
href="mailto:castor-users-bounces@lists.castor-project.org">castor-users-bounces@lists.castor-project.org</a>]
de la part de M.R Teimoori [<a moz-do-not-send="true"
class="moz-txt-link-abbreviated"
href="mailto:reza.teimoori.s@gmail.com">reza.teimoori.s@gmail.com</a>]<br>
<b>Envoyé :</b> mercredi 3 mai 2017 20:14<br>
<b>À :</b> <a moz-do-not-send="true"
class="moz-txt-link-abbreviated"
href="mailto:castor-users@lists.castor-project.org">castor-users@lists.castor-project.org</a><br>
<b>Objet :</b> [Castor-users] Attenuation Image and
Coefficients in PET List-mode Recon<br>
</font><br>
</div>
<div>
<div dir="ltr">Hello,
<div><br>
</div>
<div>When reconstructing PET list-mode data with
attenuation correction, CASToR requires an attenuation
correction factor for each event in the input *.cdf
file. Also, if the attenuation correction flag is on, an
attenuation image needs to be passed to CASToR which, as
far as I understand, is used during normalization. </div>
<div><br>
</div>
<div>I am wondering why CASToR doesn't use the input
attenuation image to calculate an attenuation correction
factor for each event automatically?</div>
<div><br>
</div>
<div>Thank you all,</div>
<div><br>
</div>
<div>Cheers,</div>
<div>Reza</div>
</div>
</div>
</div>
<br>
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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)
Bâtiment 1
CHRU Morvan - 2, Av. Foch
29609 Brest CEDEX - FRANCE
Tel: 06.75.12.24.90</pre>
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<br>
<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)
Bâtiment 1
CHRU Morvan - 2, Av. Foch
29609 Brest CEDEX - FRANCE
Tel: 06.75.12.24.90</pre>
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