[Castor-users] How to apply 'time resolution (200 ps)' and 'random&scatter correction' to the offset detector

[tmerlin]

Dear Suhwan,


Regarding TOF, the difference in arrival time of the two singles is 
computed from the time1/time2 variables of the GATE Coincidence root 
output file. The maximum range of TOF measurements can be approximated 
by the coincidence window.


Regarding scatter and random corrections, I suggest you have a look at 
this previous discussion on the matter:

https://lists.castor-project.org/pipermail/castor-users/2020-September/000433.html


About TOF scatter estimation:

https://lists.castor-project.org/pipermail/castor-users/2019-November/000281.html


I would advise to discard scatter/random correction in a first step and 
only consider the reconstruction of true coincidence data. When you get 
this right, then focus on including scatter and random corrections.


Best regards,
Thibaut


On 08/03/2022 14:49, Shwan K wrote:
>
> Dear Thibaut,
>
> Thank you for your answer.
>
> I will explain in more detail.
>
> So far, I have used the "-TOF_reso" option when simulating a 
> traditional 1-layer crystal detector with a 'cylindricalPET'.
>
> But the situation is different now.
>
> I tried to perform offset detector image reconstruction with 
> 'cylindricalPET', but I found that 'cylindricalPET' offset detector 
> could not reconstruct CASTOR images.
>
> Therefore, 'systemType' is performing offset detector simulation using 
> 'PETscanner'. Therefore, I have to make my own cdf and cdh files 
> without using 'castor-GATERootToCastor'.
>
> Therefore, I checked 'Table 3' of CASToR_general_documentation and I 
> am going to try image reconstruction.
>
> But it's hard for me to understand 'Table 3'.
>
> I don't know what data output from 'GATE Coincidence output' should be 
> used for scatter correction, random correction and TOF image 
> reconstruction.
>
> I'm sorry I couldn't tell you the details of the previous question.
>
> If you don't have enough explanation, please ask me again.
>
> And I would appreciate it if you could let me know if there is any 
> other way other than "PETscanner."
>
> Thank you. I look forward to hearing from you.
>
> -----Original Message-----
> *From:* "tmerlin"<Thibaut.Merlin at univ-brest.fr>
> *To:* <castor-users at lists.castor-project.org>;
> *Cc:*
> *Sent:* 2022-03-08 (화) 01:00:38 (GMT+09:00)
> *Subject:* Re: [Castor-users] How to apply 'time resolution (200 ps)' 
> and 'random&scatter correction' to the offset detector
>
> Dear Suhwan,
>
>
> Using the GATE to CASToR tool, you can use the "/-TOF_reso/" option in 
> order to enable TOF and set a time resolution corresponding to the CRT.
>
> Regarding scatter and random correction, the tool just computes 
> scatter/random rate according to the acquisition and doesn't perform 
> real scatter and random corrections. If you want to perform these 
> corrections, you will have to compute them yourself. Alternatively, 
> you can choose to ignore scatter and random and only convert the trues 
> with the /-t/ option.
>
>
> Hope this helps,
> Thibaut
>
>
> On 07/03/2022 12:47, Shwan K wrote:
>>
>> Dear CASToR Users and Developers,
>>
>> Hi I am Suhwan Kim
>>
>> I designed the offset detector of 'PETscanner' using the GATE tool.
>>
>> I want to apply 'time resolution (200 ps)' and 'random&scatter 
>> correction' when performing image reconstruction.
>>
>> I don't know how to proceed.
>>
>> can you help me??
>>
>> Thanks
>>
>> Suhwan Kim
>>
>>
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>>
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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
>
-- 
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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