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<p>Dear Li,</p>
<p>I believe you already tried it, but you could also parameterize
the direction of the detector indexation using "rotation
direction: CCW" in your geom file (clockwise is default). <br>
</p>
<p>Hope this helps,<br>
Thibaut</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 20/10/2020 01:54, Li, Shenpeng
(H&B, Parkville) wrote:<br>
</div>
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<p class="MsoNormal">Dear Castor users,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I am trying to convert the raw PET data
(list-mode) from Phillips Gemini TF 64 to Castor format.
Currently, I can read the pair of crystal indexes (transvers
and axial) from Gemini data, and then use them to generate the
crystal IDs to the corresponding events. I converted the PET
data to the Castor formats (both list-mode and histogram) by
using the crystal IDs from Gemini. However, I found the
orientation difference between castor reconstruction and PET
console reconstruction. I have tried to change the “resections
first angle” in the geom file to match the rotation, but the
castor image is still flipped (left-right and
superior-inferior). I am not sure whether this image flip is
related to the indexation direction (eg. clock-wise v.s.
counter clock-wise) between castor and Gemini. The mismatch
orientation between then castor image and CT attenuation map
(in Gemini orientation ) makes attenuation correction
difficult.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Does anyone know the details of Gemini’s
crystal indexation? So, I can convert the crystals IDs to the
castor indexation. Or, is it possible to derive the sinogram
of attenuation file from scanner (similar to Siemens machines
by using e7tools)? or What other options to solve this issue.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I appreciate your help.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Best Regards,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="vertical-align:baseline"><b><span
style="font-size:12.0pt;color:black">Shenpeng Li, PhD.</span></b><span
style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="vertical-align:baseline"><span
style="font-size:10.0pt;font-family:inherit;color:#201F1E;border:none
windowtext 1.0pt;padding:0cm">CERC Postdoctoral Fellow</span><span
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<p class="MsoNormal" style="vertical-align:baseline"><b><span
style="font-size:10.0pt;font-family:inherit;color:#323130;border:none
windowtext 1.0pt;padding:0cm">Health and Biosecurity, The
Australian e-Health Research Centre, CSIRO</span></b><span
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<p class="MsoNormal" style="vertical-align:baseline"><span
style="font-size:10.0pt;font-family:inherit;color:#323130;border:none
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Parade, Parkville, Victoria 3052, Australia<o:p></o:p></span></p>
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<p class="MsoNormal" style="vertical-align:baseline"><b><span
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<pre class="moz-quote-pre" wrap="">_______________________________________________
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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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