[Castor-users] attenuation correction and normalization

[tmerlin]

Hi Hadi,

You can provide an attenuation map to castor-recon if you use list-mode 
format with the -atn option (or directly to castor-GATERootToCastor if 
you want to get an histogram) .

castor-GATERootToCastor doesn't perform normalization correction, so 
normalization correction coefficients would have to be computed manually 
and inserted directly in the datafiles, as indicated in the 
documentation section 6.1.

Looking at your image, it is not easy to know what is wrong without 
details about the simulation and the image values, but it seems it was 
reconstructed from a simulation with very low statistics.

Hope this helps,
Thibaut

On 24/04/2021 12:23, Hadi Rezaei wrote:
> Dear CASToR users
> I simulated an IEC NEMA phantom on a PET using GATE and reconstructed 
> it using CASTOR without any correction (random, scatter, attenuation 
> and normalization). The reconstructed image was undesirable. I found 
> that for random and scatter correction I can write "-t" on 
> the castor-GATERootToCastor to convert only trues (is it right?). But, 
> how can I perform the attenuation correction (and also normalization)?
> I used bellow commands for convert to CASTOR and reconstructed it.
>  ./castor-GATERootToCastor -i output.root -m mymacfile.mac -o IEC -s 
> IEC -geo -k
> ./castor-recon -df IEC_df.Cdh -dout IEC -opti MLEM -it 10:20 -th 40 
> -dim 512,512,1655 -fov 600,600,1940
> I attached the reconstructed image here. I would therefore 
> appreciate it if anyone could help me to apply any correction on it.
> Best regards
> Hadi
>
>
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-- 
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

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