[Castor-users] Attenuation correction for PET image

[tmerlin]

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> de 
> la part de 김연경 <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 <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

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