[Castor-users] [Castor--users] image reconstruction using GATE simulation data for attenuation and normalization correction

[tmerlin]

Dear Yeongkyeong,

Regarding attenuation correction, you should provide an attenuation 
image (interfile format) of the jaszczak phantom in cm-1 unit to the 
/castor-recon/ executable (assuming your GATE data has been converted to 
list-mode, which is selected by default for data converted from GATE). 
Note that the conversion utility (/castor-GATERootToCastor/) also 
contains an /-atn/ option, which is only to use if you want an histogram 
dataset.

There is currently no tools to automatically compute normalization 
correction factors. You could generate a normalization datafile (see the 
documentation 
<http://www.castor-project.org/sites/default/files/2018-11/CASToR_general_documentation.pdf>, 
section 6.1.2) for your GATE data using this kind of method: 
https://ieeexplore.ieee.org/document/6153804. Alternatively, you could 
directly generate a sensitivity image containing normalization 
corrections using a GATE simulation of an uniform object spanning the 
whole field of view of your system. Then, you provide this image to 
/castor-recon/ using /-sens//path/to/your_sensitivity_image.hdr/ to 
bypass the sensitivity image generation step and use your image 
instead). However, this approach should be less accurate.

Finally the error you get means the code can't find the scanner 
repository, which is apparently located at 
//GATE/castor_v.2.0.2///castor_v2.0.2/config/scanner /in your system. 
You should check if the path is correct (no typo?).
//

Hope this helps!

Best regards,

Thibaut


On 28/01/2019 11:18, 김연경 wrote:
> Dear CASToR users,
>
> I obtained the image of the gate simulation data using the castor program.
>
> What data should I use to make attenuation and normalization 
> correction for the image?
>
> I want to use the -atn command. Can you explain the example sentence?
>
> The current data is obtained by using jaszczak phantom. Do you need 
> additional uniform phantom data for image correction?
>
> And I keep getting the error below. Could you tell me the cause and 
> how to fix it?
> image.png
>
> How can we solve it?
> Any help I would really appreciate it.
>
> Best regards,
>
> Yeongkyeong KIM
>
> -- 
>
> YEONKYEONG KIM
>
> Molecular Imaging Research&Education Laboratory (MIRE Lab)
> Department of Electronic Engineering,Sogang University
>
> 1105, Teilhard Hall(TE 1105), Sogang University
> 35 Baekbeom-ro, Mapo-gu, Seoul, South Korea 121-742
> Tel  : +82-2-713-2652
> 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)
Bâtiment 1
CHRU Morvan - 2, Av. Foch
29609 Brest CEDEX - FRANCE
Tel: 06.75.12.24.90

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