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<p>Dear Alberto Sanchez,</p>
<p>The random correction factors are expected to be rates (count/s).
They are normalized during the reconstruction by the
frame/acquisition duration in seconds (if provided), and added to
the forward projection value alongside scatter correction factors.</p>
Thank you for the bug report, we are currently working on a patch.
As Niccolo previously mentioned, the corrected version (attached
file) should work fine.<br>
<br>
Best regards,<br>
Thibaut<br>
<br>
<br>
<div class="moz-cite-prefix">On 04/07/2017 12:05, Alberto
Sánchez-Pastor Gomis wrote:<br>
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<div>Dear all,<br>
<br>
</div>
I would like to apologize for not being able to figure
this out but, how do the random corrections work in
CASToR?<br>
<br>
</div>
I've seen that there is the option of providing a file
containing the "randoms correction factors" and that the
PET data formats can include the random intensity rates
but is this based around the calculation from the singles'
rates or is this applicable to the delayed window method?
And what do "randoms correction factors" represent? Is it
the fraction of counts in an LOR that you expect to be
random counts?<br>
<br>
</div>
Additionally I would like to mention that I believe that
there is a bug in the sensitivity calculation when using the
"min angle difference" other than 0. I was attempting to
implement a scanner using 8 rectors and a min angle
difference of 90 but it just meant that the sensitivity
dropped in an angular section of 90 deg of the FOV leaving
it asymmetrical.<br>
<br>
</div>
Regards,<br>
</div>
Alberto Sanchez<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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