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<p>Hi Kurt,</p>
<p><br>
</p>
<p>The GATE conversion functions in CASToR are restricted to ROOT
output indeed. The detected singles are rebinned into pixels
accordingly to their GlobalPosX/Y/Z root variables and the pixel
matrix (set by the user). Also, the converter assumes parallel
collimators are used. However, there are some functions in the
code for the conversion of gate projections (.hdr/.sin), but there
have not been thoroughly tested. I could send you a version of the
code with these functions enabled if you want to give it a try.</p>
<p><br>
</p>
<p>CASToR's collimator models are quite simple and rely on the
computation of focal points in order to draw lines of response
during reconstruction. If I am not mistaken, with D-SPECT, the
collimators could span different angles during acquisition while
the detector remains static ? If the number of angles are fixed
(not continuously moving), one workaround to make it work with
CASToR would be to define as many heads as number of panels*number
of sweep angles, and set different collimators models for each
heads. The functions allowing to convert GATE data would require
quite some modifications though.</p>
<p><br>
</p>
<p>I hope this helps</p>
<p><br>
</p>
<p>Best regards,</p>
<p>Thibaut<br>
</p>
<p><br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 06/05/2020 06:42, Kurt V wrote:<br>
</div>
<blockquote type="cite"
cite="mid:YT1PR01MB311677648A85D7C0E61ABE9590A40@YT1PR01MB3116.CANPRD01.PROD.OUTLOOK.COM">
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<p style="margin: 0cm 0cm 8pt; line-height: 107%; font-size:
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Dear Castor Users,</p>
<p style="margin: 0cm 0cm 8pt; line-height: 107%; font-size:
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<br>
</p>
<p style="margin: 0cm 0cm 8pt; line-height: 107%; font-size:
11pt; font-family: Calibri, sans-serif">
I am a new user, inquiring about Castors capabilities with
GATE MC.</p>
<p style="margin: 0cm 0cm 8pt; line-height: 107%; font-size:
11pt; font-family: Calibri, sans-serif">
<br>
</p>
<p style="margin: 0cm 0cm 8pt; line-height: 107%; font-size:
11pt; font-family: Calibri, sans-serif">
Ideally, I would like to model a dynamic spect (D-SPECT)
system and output a projection image (.sin and .hdr) from a
volume source and then reconstruct the projection image.</p>
<p style="margin: 0cm 0cm 8pt; line-height: 107%; font-size:
11pt; font-family: Calibri, sans-serif">
<br>
</p>
<p style="margin: 0cm 0cm 8pt; line-height: 107%; font-size:
11pt; font-family: Calibri, sans-serif">
Question 1) </p>
<p style="margin: 0cm 0cm 8pt; line-height: 107%; font-size:
11pt; font-family: Calibri, sans-serif">
Is Castor capable of reconstructing a. sin and. hdr projection
output from a SPECT image from Gate?</p>
<p style="margin: 0cm 0cm 8pt; line-height: 107%; font-size:
11pt; font-family: Calibri, sans-serif">
- I see a lot about root output but, I don’t believe this
format is useful for SPECT. It would be a .sin (projection)
& .hdr (header).</p>
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11pt; font-family: Calibri, sans-serif">
<br>
</p>
<p style="margin: 0cm 0cm 8pt; line-height: 107%; font-size:
11pt; font-family: Calibri, sans-serif">
Question 2)</p>
<p style="margin: 0cm 0cm 8pt; line-height: 107%; font-size:
11pt; font-family: Calibri, sans-serif">
Would a D-SPECT system be too tricky to reconstruct since it
is unconventional? </p>
<p style="margin: 0cm 0cm 8pt; line-height: 107%; font-size:
11pt; font-family: Calibri, sans-serif">
-12 close panels sweeping, should I switch to a more
traditional SPECT type?</p>
<p style="margin: 0cm 0cm 8pt; line-height: 107%; font-size:
11pt; font-family: Calibri, sans-serif">
<o:p> </o:p></p>
<p style="margin: 0cm 0cm 8pt; line-height: 107%; font-size:
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Thanks all and I appreciate all suggestions,</p>
<p style="margin: 0cm 0cm 8pt; line-height: 107%; font-size:
11pt; font-family: Calibri, sans-serif">
Kurt Van Delinder</p>
<br>
</div>
<br>
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<pre class="moz-quote-pre" wrap="">_______________________________________________
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</blockquote>
<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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