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

[Suguru Katsube]

Dear Thibaut Merlin,

Thank you for your quick response.
Successfully, I made the attenuation image. Then, I made **.cdh and **.cdf
with attenuaton correrction using castor-GATERootToCastor (This is
list-mode format for reconstructing with scatter and random correction).

When I run castor-recon, the message below was displayed.




****** oSensitivityGenerator::InitializeAttenuationFiles() -> Attenuation
correction is included in the data file while it is not in the sensitivity
computation !***** oSensitivityGenerator::Initialize() -> A problem
occurred while initializing the attenuation files !***** castor-recon() ->
A problem occurred while initializing the sensitivity generator !*

I know that the attenuation image MUST be providen to the castor-recon exe
as well, in order to perform sensitivity image computation for PET
list-mode. How should I provide attenuation image to reconstruct the data?

Thank you in advance.
Best regards,

Suguru

2020年6月30日(火) 0:00 tmerlin <Thibaut.Merlin at univ-brest.fr>:

> 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 <E-mail%3Aymmk88kmmy 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
>
> _______________________________________________
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>


-- 
○●----------------------------------------------------------●○
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 <E-mail%3Aymmk88kmmy at gmail.com>
○●----------------------------------------------------------●○
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