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<p>Hi,</p>
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<p>For real datasets, do you include random, scatter and attenuation corrections ? Did you compute a normalization correction ?</p>
<p>Do you have an estimation of the ratio of random and scatter events ?<br>
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<p>For GATE data, did you include only true coincidences ? Then did you compute a normalization correction and include it in the reconstruction ?<br>
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<p>For the quality phantom data, I suggest that you run more iterations. The "stars" artifacts are likely due to that.<br>
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<p>Simon<br>
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<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>De :</b> Castor-users <castor-users-bounces@lists.castor-project.org> de la part de poseidon_zhao <poseidon_zhao@qd.acmlife.org><br>
<b>Envoyé :</b> dimanche 14 novembre 2021 05:18<br>
<b>À :</b> castor-users<br>
<b>Objet :</b> [Castor-users] Debug about noisy background in recon images( using .lut scanner interation)</font>
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<div><font><span style="font-family:"lucida Grande",Verdana; font-size:15.3333px">Dear CASToR users:</span></font></div>
<div><font><span style="font-family:"lucida Grande",Verdana; font-size:15.3333px"> I reconstructed 3 images by castor-recon successfully, but I </span></font><span style="font-size:15.3333px"><font face="lucida Grande, Verdana">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
</font><font face="Arial, PingFang SC, Hiragino Sans GB, STHeiti, Microsoft YaHei, WenQuanYi Micro Hei, sans-serif" color="#333333"><span style="background-color:rgb(249,249,249)">attached as follow:</span></font></span></div>
<div><font face="Arial, PingFang SC, Hiragino Sans GB, STHeiti, Microsoft YaHei, WenQuanYi Micro Hei, sans-serif" color="#333333"><span style="font-size:15.3333px; background-color:rgb(249,249,249)">(1) image quality phantom data from real </span><span style="font-size:15.3333px">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/</span></font><span style="color:rgb(51,51,51); font-family:Arial,"PingFang SC","Hiragino Sans GB",STHeiti,"Microsoft YaHei","WenQuanYi Micro Hei",sans-serif; font-size:15.3333px">HiPET_IQP</span><font face="Arial, PingFang SC, Hiragino Sans GB, STHeiti, Microsoft YaHei, WenQuanYi Micro Hei, sans-serif" color="#333333"><span style="font-size:15.3333px"> -th
0</span></font><span style="font-size:15.3333px; color:rgb(51,51,51); font-family:Arial,"PingFang SC","Hiragino Sans GB",STHeiti,"Microsoft YaHei","WenQuanYi Micro Hei",sans-serif">"</span></div>
<div><span style="font-size:15.3333px; color:rgb(51,51,51); font-family:Arial,"PingFang SC","Hiragino Sans GB",STHeiti,"Microsoft YaHei","WenQuanYi Micro Hei",sans-serif">(2) point source(Na-22) data from </span><span style="color:rgb(51,51,51); font-family:Arial,"PingFang SC","Hiragino Sans GB",STHeiti,"Microsoft YaHei","WenQuanYi Micro Hei",sans-serif; font-size:15.3333px; background-color:rgb(249,249,249)">real </span><span style="color:rgb(51,51,51); font-family:Arial,"PingFang SC","Hiragino Sans GB",STHeiti,"Microsoft YaHei","WenQuanYi Micro Hei",sans-serif; font-size:15.3333px">experimental
data collection. Reconstruction command ："</span><font face="Arial, PingFang SC, Hiragino Sans GB, STHeiti, Microsoft YaHei, WenQuanYi Micro Hei, sans-serif" color="#333333"><span style="font-size:15.3333px">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</span></font><span style="color:rgb(51,51,51); font-family:Arial,"PingFang SC","Hiragino Sans GB",STHeiti,"Microsoft YaHei","WenQuanYi Micro Hei",sans-serif; font-size:15.3333px">"</span></div>
<div><span style="font-size:15.3333px; color:rgb(51,51,51); font-family:Arial,"PingFang SC","Hiragino Sans GB",STHeiti,"Microsoft YaHei","WenQuanYi Micro Hei",sans-serif">(3) </span><span style="font-size:15.3333px; color:rgb(51,51,51); font-family:Arial,"PingFang SC","Hiragino Sans GB",STHeiti,"Microsoft YaHei","WenQuanYi Micro Hei",sans-serif">point
source(Na-22) data from <span style="background-color:rgb(249,249,249)">GATE simulation</span></span><span style="color:rgb(51,51,51); font-family:Arial,"PingFang SC","Hiragino Sans GB",STHeiti,"Microsoft YaHei","WenQuanYi Micro Hei",sans-serif; font-size:15.3333px">.
Reconstruction command ："</span><font face="Arial, PingFang SC, Hiragino Sans GB, STHeiti, Microsoft YaHei, WenQuanYi Micro Hei, sans-serif" color="#333333"><span style="font-size:15.3333px">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</span></font><span style="color:rgb(51,51,51); font-family:Arial,"PingFang SC","Hiragino Sans GB",STHeiti,"Microsoft YaHei","WenQuanYi Micro Hei",sans-serif; font-size:15.3333px">"</span></div>
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