[Castor-users] Debug about noisy background in recon images( using .lut scanner interation)

[STUTE Simon]

Hi,


For real datasets, do you include random, scatter and attenuation corrections ? Did you compute a normalization correction ?

Do you have an estimation of the ratio of random and scatter events ?


For GATE data, did you include only true coincidences ? Then did you compute a normalization correction and include it in the reconstruction ?


For the quality phantom data, I suggest that you run more iterations. The "stars" artifacts are likely due to that.


Simon



________________________________
De : Castor-users <castor-users-bounces at lists.castor-project.org> de la part de poseidon_zhao <poseidon_zhao at qd.acmlife.org>
Envoyé : dimanche 14 novembre 2021 05:18
À : castor-users
Objet : [Castor-users] Debug about noisy background in recon images( using .lut scanner interation)

Dear CASToR users:
     I reconstructed 3 images by castor-recon successfully, but I encountered some bugs. They are all from the same '.lut' scanner system interation. The shapes of 3 recon images are right, but they all seems to have one common problem: Severe background noises. The 3 result images are attached as follow:
(1) image quality phantom data from real experimental data collection. Reconstruction command :"castor-recon -df /home/castor/workDir/cdf/HiPET_IQP.Cdh -opti MLEM -it 2:10 -proj joseph -conv gaussian,1,1,3::psf -dim 300,300,400 -vox 0.336,0.336,0.336 -dout /home/castor/workDir/img/HiPET_IQP -th 0"
(2) point source(Na-22) data from real experimental data collection. Reconstruction command :"castor-recon -df /home/castor/workDir/cdf/181024-5-x-10mm-step5mm-axial-0mm-singlesV927-nemaPtsrc-3600s-idRun-2-sdatAnaV24-datAnaV10-dat2lmfV4.Cdh -opti MLEM -it 20:10 -proj joseph -conv gaussian,2,2,3.5::psf -dim 220,220,340 -vox 0.336,0.336,0.336 -dout /home/castor/workDir/img/181024-5-x-10mm-step5mm-axial-0mm-singlesV927-nemaPtsrc-3600s-idRun-2-sdatAnaV24-datAnaV10-dat2lmfV4 -th 0"
(3) point source(Na-22) data from GATE simulation. Reconstruction command :"castor-recon -df /home/castor/workDir/cdf/HiPET_nemaPtsrc_10uCi_10s_csh-noCLCS-lld-0.35-uld-0.65.Cdh -opti MLEM -it 20:10 -proj joseph -conv gaussian,2,2,3.5::psf -dim 220,220,340 -vox 0.336,0.336,0.336 -dout /home/castor/workDir/img/HiPET_nemaPtsrc_10uCi_10s_csh-noCLCS-lld-0.35-uld-0.65 -th 0"

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.castor-project.org/pipermail/castor-users/attachments/20211115/abdd0544/attachment.html>