[Castor-users] [Castor--users] TOF image reconstruction using GATE simulation data

[Thibaut Merlin]

  Hi Yeongkyeong,

There is no additional commands to use besides /-TOF_reso/, which will
provide the assumed time resolution of the system. The TOF measurements
/dt/ for each event is computed from the time1 and time2 ROOT variables,
and the time measurement range (written in the datafile header) is
recovered during the conversion process. You could check if the /dt/
measurements in your datafile seems consistent using the
castor-datafileExplorer executable with the following options to explore
the datafile event by event :  /-df /path/to/datafile/header -i -e/
Depending on the ToF resolution, the convergence with ToF correction could
be much faster than with non ToF. At some point, increasing the number of
iterations would just increase the noise level, so it could be worth to
check the image you get just after a few iterations (e.g 3, 4 iterations,
without subsets).

Hope this helps !

Kind regards,
Thibaut

김연경 <dusrud026 at gmail.com> a écrit :

> Dear CASToR users,
>          
>                  I try to reconstruct the TOF image by converting the
> root result obtained by the GATE simulation into a castor file.
>          I have added the TOF_reso command and converted the data. Do I
> need any other commands besides this command?
>           
>          The command I wrote is below.
>          castor-GATERootToCastor -i my_data.root  -m my_data.mac -o
> my_TOF_image -s my_data -TOF_reso 220. -src
>          In the above command, TOF image and nonTOF image were
> reconstructed using TOF_reso command. However, image results were nonTOF
> image better than TOF image.
>
>          
>         The commands used to create the two images are shown below.
>         castor-recon -vb 2 -df 181221_nonTOF_t15_60s_jaszczak_src_df.Cdh
> -fout 181221_nonTOF_t15_60_jaszczak_src -it 5:5 -dim 400,400,400 -opti
> MLEM -proj joseph -conv gaussian,3.,3.,3.::psf
>
>
>         How can we solve it?
>         Any help I would really appreciate it.
>          
>         Best regards,
>          
>         Yeongkyeong KIM
>          
> --
>
>           YEONKYEONG KIM
>
>           Molecular Imaging Research&Education Laboratory (MIRE Lab)
> Department of Electronic Engineering,Sogang University
>
>           Email : dusrud026 at gmail.com
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