[Castor-users] Attenuation correction for PET image

[tmerlin]

Hi,

You must provide an image containing, for each voxel, the attenuation 
coefficient value related to your object.

If you used voxelized phantoms in your GATE simulation (source/phantom 
definition), you must provide a similar image with 511-keV//(for PET) 
attenuation coefficients for each voxels. If you use a geometric 
phantom/object geometry, you must generate this image.

On a side note, it is not mandatory to use an attenuation image with the 
same voxel size/number of the reconstruction image matrix though. The 
attenuation image will be interpolated if the image matrices are different.

Hope this helps,
Thibaut


On 22/01/2020 02:32, 김연경 wrote:
> Dear Thibaut
>
> Hi!
>
> Thank you for your answer.
> Sorry, The damping factor in Q2 is the wrong attenuation factor. So, I 
> wrote the question again below.
>
> Q1. If you provide an image filled with only 'attenuation coefficient 
> value' after '-atn', is it right for the CASToR program to calculate 
> the 'attenuation factor' according to the distance or position within 
> the phantom?
>       Or do I have to provide an image that included calculated 
> attenuation factors for each position of the phantom?
>
>
> Best regard
>
>
> -- 
>
> 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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