[Castor-users] Attenuation correction for PET image

[tmerlin]

Hi Yeonkyeong,

On 21/01/2020 11:31, 김연경 wrote:
> Dear Thibaut,
>
> Thank you for your answer.
> But, I didn't fully understand your answer. So, I have additional 
> questions for you.
>
> Q1. what does mean of 'only recovered true coincidences for GATE 
> simulation data'?
> When converting(GATERootToCastor) data, is it possible to correct only 
> the data obtained by applying the '-t' option?

Using the -t option, only the true coincidences will be converted to 
your CASToR datafile.

>
> Q2. If you provide an image filled with only 'attenuation coefficient 
> value' after '-atn', is it right for the CASToR program to calculate 
> the 'damp factor' according to the distance or position of the phantom?
> Or do I have to provide an image that included calculated attenuation 
> factors for each position of the phantom?

I am not sure what you mean by damp (damping ?) factor. Perhaps could 
you cite a paper which refers to it ?

>
> Q3. When the simulation data is converted to histogram mode, the Cdh 
> file does not show TOF flags or Histo TOF bin size. What additional 
> options should I use?
> I used the commands written below.
> castor-GATERootToCastor -m TOF_257_t10_jas2_uniform.mac -s 
> TOF_t10_uniform -i 200116_TOF_t10_uniform_120s.root -o 
> 200120_TOF_t10_uniform_hist_vb_tof -TOF_reso 180 -vb 4 -oh
>
Unfortunately you can't. The TOF options in the 
/castor-GATERootToCastor/ converter are only available with list-mode 
output.

Best,
Thibaut


> Any help I would really appreciate it.
>
> Best regards
>
>
> 2020년 1월 20일 (월) 오후 11:23, tmerlin <Thibaut.Merlin at univ-brest.fr 
> <mailto:Thibaut.Merlin at univ-brest.fr>>님이 작성:
>
>     Hi,
>
>
>     Just to add to Simon's answer:
>
>
>     If you only recovered true coincidences from the GATE simulation
>     data, and if you are using list-mode data, then with the -atn
>     option you can provide an (interfile) image containing the
>     attenuation coefficient value (in cm-1) to correct for attenuation
>     during reconstruction. Attenuation correction factors will be used
>     as multiplicative correction factors during the computation of the
>     sensitivity image (which is calculated first when you launch the
>     reconstruction), so the sensitivity image will include correction
>     for attenuation.
>
>
>     Best,
>
>     Thibaut
>
>
>
>     On 20/01/2020 10:27, STUTE Simon wrote:
>>
>>     Hi,
>>
>>
>>     I may be wrong but Chang's method is for SPECT.
>>
>>
>>     For PET, you have to compute the attenuation correction factor
>>     for each event also, and add this information in the datafile.
>>
>>
>>     Simon
>>
>>
>>     ------------------------------------------------------------------------
>>     *De :* Castor-users
>>     <castor-users-bounces at lists.castor-project.org>
>>     <mailto:castor-users-bounces at lists.castor-project.org> de la part
>>     de 김연경 <dusrud026 at gmail.com> <mailto:dusrud026 at gmail.com>
>>     *Envoyé :* lundi 20 janvier 2020 09:43
>>     *À :* castor-users at lists.castor-project.org
>>     <mailto:castor-users at lists.castor-project.org>; Thibaut Merlin
>>     *Cc :* Yong Choi
>>     *Objet :* [Castor-users] Attenuation correction for PET image
>>     Dear CASToR users
>>
>>     I obtained the image of the GATE simulation data using the castor
>>     program.
>>
>>     I would like to ask the confusing part of applying the
>>     attenuation correction to the acquired image. The data is list mode.
>>
>>     if I enter the same image as the phantom size with attenuation
>>     coefficient value into the -atn option, will the attenuation
>>     factor be calculated within the caster program's code and
>>     corrected for the image?
>>
>>     If the method described above is correct, does the program use
>>     the method of Chang's multiplicative?
>>
>>     Any help I would really appreciate it.
>>
>>     Best regards
>>     -- 
>>
>>     YEONKYEONG KIM
>>
>>     Molecular Imaging Research&Education Laboratory (MIRE Lab)
>>     Department of Electronic Engineering,Sogang University
>>
>>     803, Ricci Hall(R 803), Sogang University
>>     35 Baekbeom-ro, Mapo-gu, Seoul, South Korea 04107
>>     Mobile : +82-10-9996-3644
>>     Email : dusrud026 at gmail.com <mailto:dusrud026 at gmail.com>
>>
>>
>>
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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
>
>     _______________________________________________
>     Castor-users mailing list
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>     <mailto:Castor-users at lists.castor-project.org>
>     http://lists.castor-project.org/listinfo/castor-users
>
>
>
> -- 
>
> YEONKYEONG KIM
>
> Molecular Imaging Research&Education Laboratory (MIRE Lab)
> Department of Electronic Engineering,Sogang University
>
> 803, Ricci Hall(R 803), Sogang University
> 35 Baekbeom-ro, Mapo-gu, Seoul, South Korea 04107
> Mobile : +82-10-9996-3644
> Email : dusrud026 at gmail.com <mailto:dusrud026 at gmail.com>
>
-- 
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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