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<p>Dear Xin Zhao,</p>
<p>Indeed the output you get is strange, but I don't see anything
wrong in your datafile header or command line options. <br>
</p>
<p>Do you get the same output (no attenuation) when you try to
reconstruct the tof dataset without tof (i.e delete the tof
related line in the datafile header) ? Did you try to reconstruct
with different time resolution to check if this has an impact on
the observed attenuation ?</p>
<p>Best,<br>
Thibaut<br>
</p>
<p>On 06/06/2022 05:18, 赵鑫 wrote:<br>
</p>
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cite="mid:d7d010f3-51d4-4581-9d23-eb3d930690d5.zhaoxin@szbl.ac.cn">
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<div style="clear:both;">Dear CASToR developers and users,<br>
<br>
We simulated a cylindrical phantom using GATE and extract time and crystalID information from ROOT file. We organized two groups of Cdh&Cdf files followed CASToR input datafile format, for non-TOF and TOF reconstruction respectively. Two recon images are shown in "non-TOF recon.png" & "141ps TOF recon.png" images as presented in the attachment. But I found out that there is almost no attenuation that can be seen in the "141ps TOF recon.png" image compared to "non-TOF recon.png". From the image profiles in "profile.png", it can be seen from the non-TOF recon image that the central area has obvious count attenuation, while the TOF recon image shows no sign of attenuation. I am curious about why because I applied no additional "-atn XXXX.hdr" attenuation correction when running castor-recon for TOF reconstruction. <br>
The CASToR recon command of 141ps TOF recon is: "castor-recon -df /home/castor/BrainPET_IEC_F18_3sphere1_5p3c_TOF141p42ps.Cdh -opti MLEM -it 10:9 -proj joseph -conv gaussian,1.7,1.7,3::psf -dim 630,630,250 -vox 0.3225,0.32255,0.3225 -dout /home/castor/img/BrainPET_IEC_F18_3sphere1_37and22and13_5p3concent_510s_TOF141p42ps_20220605 -th 0". The TOF recon datafile header "BrainPET_IEC_F18_3sphere1_5p3c_TOF141p42ps.Cdh" is also submitted in the attechment.<br>
Do you have any idea why attenuation seems not obvious in the TOF recon image from castor-recon? Can you point out what went wrong with my TOF Recon? Any advice and suggestion will be greatly appreciated. Thank you! <br>
<br>
All the best,<br>
Xin Zhao<br>
<br>
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<br>
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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)
Institut Brestois de recherche en Bio-Santé (IBRBS)
12 Avenue Foch, 29200 Brest, FRANCE
Tel: 06.75.12.24.90</pre>
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