[Castor-users] TOF Reconstruction ERROR

Wed Mar 30 20:40:30 CEST 2022

Dear Suhwan,

Sorry for the late answer.

There is something wrong in the computation of TOF difference arrival 
time factors. Their values make no sense (e-43/e-44 ps).

See below the first two events of your file (you can explore further 
your data file with the /castor-datafileExplorer/ tool, or using some 
hexadecimal editors).

Regarding the bright corners of the image, the sensitivity at the edges 
of your image is typically very low and can produce this kind of 
artifact in various situation, such as:

- No correction of attenuation if it was included in your simulation

- Very low statistics, which can contribute to weird signals.

- No correction of scatter/random coincidences. Signal from these 
coincidences which may originate from around the phantom could 
accumulate near the edges of the image.

Hope this helps!

Thibaut Merlin

On 26/03/2022 04:26, Shwan K wrote:
>
> 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
>
> PC저장 
> <https://can01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fbigfile.mail.naver.com%2Fdownload%3Ffid%3DCPY9FAicbrnjK3Y%2FFqudFoUdFA2qKwYZKAUZKAKZKqudKoMqFwYwFoEmFoKlFxvlHq2lFA%2B4px3CpA%2B4KzuXpAMmFq%2Bvazp4FoEZMrMlF4KZ&data=04%7C01%7Cmaxime.toussaint%40usherbrooke.ca%7C47d0be1b291549d88c4308da0c8ea8c4%7C3a5a8744593545f99423b32c3a5de082%7C0%7C0%7C637836104596337621%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=GqhXJN2BD57l1FqCrJvuDDLk7URkVDxAo0ymXkxoiQ8%3D&reserved=0> 
> 	네이버 MYBOX 
> <https://can01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fmybox.naver.com%2FsaveFile%3Fservice%3Dmail%26resource%3D%257B%2522size%2522%253A451351572%252C%2522name%2522%253A%2522nonTOF.Cdf%2522%252C%2522downloadUrl%2522%253A%2522bigfile.mail.naver.com%252Fdownload%253Ffid%253DCPY9FAicbrnjK3Y%252FFqudFoUdFA2qKwYZKAUZKAKZKqudKoMqFwYwFoEmFoKlFxvlHq2lFA%252B4px3CpA%252B4KzuXpAMmFq%252Bvazp4FoEZMrMlF4KZ%2522%252C%2522key%2522%253A%2522%2522%257D%26filekey%3DCPY9FAicbrnjK3Y%2FFqudFoUdFA2qKwYZKAUZKAKZKqudKoMqFwYwFoEmFoKlFxvlHq2lFA%2B4px3CpA%2B4KzuXpAMmFq%2Bvazp4FoEZMrMlF4KZ&data=04%7C01%7Cmaxime.toussaint%40usherbrooke.ca%7C47d0be1b291549d88c4308da0c8ea8c4%7C3a5a8744593545f99423b32c3a5de082%7C0%7C0%7C637836104596337621%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=pxRbhvwcq%2FWtcHE%2F6Qp1c0SUbqgi0eQd7yys5fm711k%3D&reserved=0> 
> 	nonTOF.Cdf 430MB 
> <https://can01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fbigfile.mail.naver.com%2Fdownload%3Ffid%3DCPY9FAicbrnjK3Y%2FFqudFoUdFA2qKwYZKAUZKAKZKqudKoMqFwYwFoEmFoKlFxvlHq2lFA%2B4px3CpA%2B4KzuXpAMmFq%2Bvazp4FoEZMrMlF4KZ&data=04%7C01%7Cmaxime.toussaint%40usherbrooke.ca%7C47d0be1b291549d88c4308da0c8ea8c4%7C3a5a8744593545f99423b32c3a5de082%7C0%7C0%7C637836104596337621%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=GqhXJN2BD57l1FqCrJvuDDLk7URkVDxAo0ymXkxoiQ8%3D&reserved=0> 
>
>
> PC저장 
> <https://can01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fbigfile.mail.naver.com%2Fdownload%3Ffid%3DCsn9FAicbrnjFIY%2FFqudFoUdFA2qKwYZKAUZKAKZKqudKoMqFwYwFoEmFoKlFxvlHrkvFqC0azFoKAgdKqUZFoI4p434p6iSFo3oKrMXpAtr&data=04%7C01%7Cmaxime.toussaint%40usherbrooke.ca%7C47d0be1b291549d88c4308da0c8ea8c4%7C3a5a8744593545f99423b32c3a5de082%7C0%7C0%7C637836104596337621%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=rjV94HToay8KWIvtroWbVBTUa%2F0%2F2WHFoL70QY6jtww%3D&reserved=0> 
> 	네이버 MYBOX 
> <https://can01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fmybox.naver.com%2FsaveFile%3Fservice%3Dmail%26resource%3D%257B%2522size%2522%253A601802096%252C%2522name%2522%253A%2522TOF.Cdf%2522%252C%2522downloadUrl%2522%253A%2522bigfile.mail.naver.com%252Fdownload%253Ffid%253DCsn9FAicbrnjFIY%252FFqudFoUdFA2qKwYZKAUZKAKZKqudKoMqFwYwFoEmFoKlFxvlHrkvFqC0azFoKAgdKqUZFoI4p434p6iSFo3oKrMXpAtr%2522%252C%2522key%2522%253A%2522%2522%257D%26filekey%3DCsn9FAicbrnjFIY%2FFqudFoUdFA2qKwYZKAUZKAKZKqudKoMqFwYwFoEmFoKlFxvlHrkvFqC0azFoKAgdKqUZFoI4p434p6iSFo3oKrMXpAtr&data=04%7C01%7Cmaxime.toussaint%40usherbrooke.ca%7C47d0be1b291549d88c4308da0c8ea8c4%7C3a5a8744593545f99423b32c3a5de082%7C0%7C0%7C637836104596337621%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=pAqYrt9iYmUjUVQPtw5dTVxAVqa7w8oVQ3l79Wys23s%3D&reserved=0> 
> 	TOF.Cdf 574MB 
> <https://can01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fbigfile.mail.naver.com%2Fdownload%3Ffid%3DCsn9FAicbrnjFIY%2FFqudFoUdFA2qKwYZKAUZKAKZKqudKoMqFwYwFoEmFoKlFxvlHrkvFqC0azFoKAgdKqUZFoI4p434p6iSFo3oKrMXpAtr&data=04%7C01%7Cmaxime.toussaint%40usherbrooke.ca%7C47d0be1b291549d88c4308da0c8ea8c4%7C3a5a8744593545f99423b32c3a5de082%7C0%7C0%7C637836104596337621%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=rjV94HToay8KWIvtroWbVBTUa%2F0%2F2WHFoL70QY6jtww%3D&reserved=0> 
>
>
>   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
>
>
>
> _______________________________________________
> Castor-users mailing list
> Castor-users at lists.castor-project.org
> https://lists.castor-project.org/mailman/listinfo/castor-users
>
> To look for something in the mailing-list archives, use the search box at:
> https://castor-project.org/mailing-list

-- 
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

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.castor-project.org/pipermail/castor-users/attachments/20220330/9bc8f713/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: dnahhhojgabdacdn.png
Type: image/png
Size: 158771 bytes
Desc: not available
URL: <http://lists.castor-project.org/pipermail/castor-users/attachments/20220330/9bc8f713/attachment-0001.png>