[Castor-users] Query related to castor-GateMacToGeom

[tmerlin]

Hello Kajal,

I can't really tell what could be wrong without knowing what was in the 
simulation. From your data and the reconstructed image, it looks like 
you simulate a line source at 1;-1 cm. Statistics are very low though 
(1k counts), so it's difficult to say if there was something wrong with 
the conversion or geometry. It doesn't look like there are issues with 
the geometry from the sensitivity image though. Perhaps you could check 
what do you get with a simulation with higher statistics ?

Best regards,

Thibaut


On 02/08/2017 11:09, Kajal Aggarwal wrote:
> Hello,
>
> Thank you for the detailed explanation. I am having troubles to 
> reconstruct an image for a cylindrical PET system simulated using 
> Gate. I am generating .geom file and .cdh and .cdf files (attached in 
> this email) for my .mac file and for the output root file. But the 
> image generated has some problem (see the screen-shot below). Please 
> guide me where I am going wrong.
>
> Thank you very much for all your support.
>
> Regards,
> Kajal
>
>
> Inline image 1
>
>
> Inline image 2
>
> On Tue, Aug 1, 2017 at 9:00 PM, tmerlin <Thibaut.Merlin at univ-brest.fr 
> <mailto:Thibaut.Merlin at univ-brest.fr>> wrote:
>
>     Hello Kajal,
>
>     F.O.V variables are arbitrary computed as /scanner_radius(mm)///4/
>     for the transaxial component, and the axial dimension (mm) of the
>     rsector/block for the axial component. The transaxial/axial number
>     of voxels are calculated from these values in order to get (large)
>     isotropic 4mm voxels.
>
>     The sole purpose of these variables is to be used as default for
>     reconstruction dimensions/voxel sizes when using this scanner, in
>     the case no dimensions have been initialized in command-line
>     options. In practice, they are overwritten by the parameters
>     entered in command line options (/-dim/ for number of voxels,
>     /-fov /-vox/ for field of view and voxel dimensions initializations ).
>
>     Best regards,
>
>     Thibaut
>
>
>     On 01/08/2017 16:54, Kajal Aggarwal wrote:
>>     Hello everyone,
>>
>>     I am trying to create .geom file from a .mac file for PET scanner
>>     system. In the .geom file created, I would like to know how the
>>     voxels number transaxial, voxels number axial, field of view
>>     transaxial, field of view axial are being calculated.
>>
>>
>>
>>
>>     -- 
>>     Thanking you.
>>     Yours sincerely,
>>     Kajal Aggarwal
>>
>>
>>     _______________________________________________
>>     Castor-users mailing list
>>     Castor-users at lists.castor-project.org
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>
>     -- 
>     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
>
> -- 
> Thanking you.
> Yours sincerely,
> Kajal Aggarwal
-- 
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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