[Castor-users] [Castor-devel] Fwd: Re: TR: SPECT reading Interfile
tmerlin
Thibaut.Merlin at univ-brest.fr
Fri Apr 28 13:18:51 CEST 2017
Hi Michael,
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.
Best regards,
Thibaut Merlin
On 26/04/2017 18:53, Michael Ljungberg wrote:
>
> Hi all
>
> 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.
>
> 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.
>
> Second question – what does the “ Normalization factor of the
> corresponding sinogram bin“ value actually do in SPECT histograms?
>
> Best regards
>
> Michael
>
>
>
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--
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
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