[Castor-users] TOF Reconstruction ERROR

[Shwan K]

Dear Maxime Toussaint
 
Thank you for your reply. 
The coincidence output data from GATE is [s]. So I multiplied it by 10^12. 
 
 
 
-----Original Message-----
From: "Maxime Toussaint"<Maxime.Toussaint at USherbrooke.ca>
To: "castor-users at lists.castor-project.org"<castor-users at lists.castor-project.org>;
Cc:
Sent: 2022-03-26 (토) 00:28:08 (GMT+09:00)
Subject: Re: [Castor-users] TOF Reconstruction ERROR
 
Greetings,
 
Maybe I am missing something, but why did you multiply the difference in arrival time by 10^12? GATE TOF data are in ps (if my memory serves me correctly) and CASToR requires TOF data in ps, right?
 
Bests,
Maxime Toussaint
De : Castor-users <castor-users-bounces at lists.castor-project.org> de la part de Shwan K <ksh2454178 at naver.com>
Envoyé : 23 mars 2022 01:31
À : castor-users at lists.castor-project.org <castor-users at lists.castor-project.org>; Shwan K <ksh2454178 at naver.com>
Objet : [Castor-users] TOF Reconstruction ERROR
 

 대용량 첨부파일 2개(1004MB)대용량 첨부 파일은 30일간 보관 / 100회까지 다운로드 가능




nonTOF.Cdf 430MB


TOF.Cdf 574MB


  다운로드 기간: 2022/03/23 ~ 2022/04/22






Dear CASToR Users and Developers, 
Hi I am Suhwan. 
 
I'm having trouble doing TOF reconstruction. I checked the castor manual to make a '.Cdf' file without using the 'castor-GATERootToCastor' command. (Table 3) 
The non-tof image reconstruction performed well. 
However, the image of Tof image reconstruction is strange. 
I checked 'Table 3' to perform non-tof reconstruction and tof reconstructionf and proceeded with the following procedure. 
 
 
 
[non-tof reconstruction] 
1. I extracted 'time', 'crystal ID1', and 'crystal ID2' after GATE simulation to proceed with non-tof reconstruction.
2. Using Matlab, 'time', 'crystal ID1', and 'crystal ID2' were combined. And I changed them to 'uint32' type.
3. As shown in the picture below, the image of the Phantom came out well.



[tof-reconstruction] 
1. For tof reconstruction, 'time', 'crystal ID1', and 'crystal ID2' were extracted after GATE simulation. And to add TOF, the difference between 'time1' and 'time2' was calculated. ((time2 - time1)*1000000000000) 
2. Using Matlab, 'time', 'time2 - time1', 'crystal ID1', and 'crystal ID2' were combined. And changed to 'uint32' type. 
3. And the following text was added to the '.Cdh' file. TOF information flag: 1 TOF resolution (ps): 168.7 List TOF measurement range (ps): 1999.99  
4.Tof reconstruction image came out strange as below.  
 
I don't know what's wrong.  

I have one more question. Why are the corners of the image bright?
 
Any advice and suggestion will be greatly appreciated. Thank you! 

Thanks
 
 
 



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