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<div style="direction: ltr;font-family: Tahoma;color: #000000;font-size: 10pt;">Dear Konstantinos,<br>
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Maybe a guess: Seeing the sourcePos from ROOT, you have a ring of activity around the two cylinders, however, in the reconstructed image, it seems that the reconstructed field-of-view is not large enaugh to include this ring. If this is the case, then the artifacts
can come from that (with iterative algorithms, the whole activity distribution has to be included in the image space).<br>
<br>
Cheers<br>
Simon<br>
<br>
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<div id="divRpF927265" style="direction: ltr;"><font size="2" color="#000000" face="Tahoma"><b>De :</b> Castor-users [castor-users-bounces@lists.castor-project.org] de la part de Konstantinos P. Chatzipapas, MSc [kwnchatz@upatras.gr]<br>
<b>Envoyé :</b> lundi 8 mai 2017 10:10<br>
<b>À :</b> Castor Users<br>
<b>Objet :</b> [Castor-users] SPECT Butterfly effect<br>
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<p>Dear users and developers,</p>
<p>I am trying to use CASToR for image reconstruction on SPECT. I have simulate 2 cylinders, 1 big + 1 small with activity. I have also slightly modify castor-GATERootToCastor in order that I can manually insert the parameters required (for example: number
of pixels, distance from scanner etc.).</p>
<p>I am attaching the images from the root file and the reconstructed ones. Does anyone know what have gone wrong?</p>
<p> </p>
<p>Thank you in advance,</p>
<p>Konstantinos</p>
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Konstantinos P. Chatzipapas <br>
Physicist, MSc <br>
Faculty of Medical Physics <br>
<strong>University of Patras</strong> <br>
<br>
web page: <em><a href="http://www.physicsmag.com" target="_blank">Physics Magazine</a></em></div>
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