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<p>Hi Michael,</p>
<p>The scatter rate is normalized by the frame/acquisition duration
in seconds (if provided) and added to the forward projection
value. The normalization factor is a multiplicative correction
factor applied during forward & backward projection.</p>
<p>Best regards,</p>
<p>Thibaut Merlin</p>
<br>
<div class="moz-cite-prefix">On 26/04/2017 18:53, Michael Ljungberg
wrote:<br>
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<p class="MsoNormal">Hi all</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Look like my conversion program works now.
I also got the attenuation correction to work. Simind and
Castor has a different orientations so I solved this by
starting at 180 degrees instead of flipping the end result.
This also aligned to the orientation of the attenuation map.</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I have a question concerning the scatter.
The value I add to the *.cdf file – is it added in the forward
projector or is it subtracted in some way? I assume the
scatter value should be normalised to the total value I also
add.</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Second question – what does the
“ Normalization factor of the corresponding sinogram bin“
value actually do in SPECT histograms?</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Best regards</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Michael <o:p></o:p></p>
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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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