[Castor-users] How to apply attenuation correction for PET reconstruction using GATE root data

[tmerlin]

Hi Suguru,

Attenuation image must be in interfile format, and must be in cm-1. The 
dimensions/voxel sizes will be interpolated to the reconstruction image 
dimensions, so you don't need to provide an image with the exact same 
dimensions than for the reconstruction. Additionally, you should make 
sure that the reconstruction image dimensions are large enough to 
include all attenuated materials of the attenuation image, otherwise the 
attenuation correction will be incorrect.

Regarding the image itself, you should generate it from the geometry of 
the phantom you use in the GATE simulation, or derive it directly from 
the phantom image if you used a voxelized phantom.

Hope this helps,

Thibaut


On 29/06/2020 09:57, Suguru Katsube wrote:
> Hi all,
>
> I am trying to reconstruct a GATE root file (PET).
> I want to apply attenuation correction and reconstruct it. The manual 
> states I need an attenuation image, how do I create it ? The phantom 
> was designed on a GATE and no CT images were acquired. There are many 
> unclear points such as image format, number of pixels, number of 
> slices, alignment, etc. Can I create the attenuation image using a 
> root file or mac file?
>
> Any advice is appreciated.
>
> Best regards,
>
> -- 
> ○●----------------------------------------------------------●○
> 　勝部　俊（Suguru Katsube）
>
> 　九州大学大学院医学系学府保健学専攻
>
> 　医用量子線科学分野　修士課程2年
>
>
> 　Medical Quantum Radiation Science Course,
>
> 　Department of Health Sciences,
>
> 　Graduate School of Medical Sciences,
>
> 　Kyushu University, Fukuoka, Japan
>
> 　E-mail: sug.katsu at gmail.com <mailto:E-mail%3Aymmk88kmmy 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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