[Castor-users] Attenuation correction for PET image

[김연경]

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?

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?

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

Any help I would really appreciate it.

Best regards


2020년 1월 20일 (월) 오후 11:23, tmerlin <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>
> <castor-users-bounces at lists.castor-project.org> de la part de 김연경
> <dusrud026 at gmail.com> <dusrud026 at gmail.com>
> *Envoyé :* lundi 20 janvier 2020 09:43
> *À :* 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
>
>
> _______________________________________________
> Castor-users mailing listCastor-users at lists.castor-project.orghttp://lists.castor-project.org/listinfo/castor-users
>
> --
> 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
> 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
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