[Castor-users] castor-GATEMacToGeom/GATERootToCastor questions

[niccolo camarlinghi]

Dear Thibaut,

I think the reconstruction is working now.
Thank you for your work.

Best Regards

Niccolo'






2017-06-29 20:37 GMT+02:00 tmerlin <Thibaut.Merlin at univ-brest.fr>:

> Dear Niccolo,
>
> Sorry for the late answer. There were some issues in the calculations of
> rsector angular position when using a small number of rsectors in the files
> I sent you. I believe this is the main cause for the issues observed in
> your image.
>
> Regarding the transaxial min angle difference variable, it is evaluated
> from the crystal orientations. Some of the artifacts in the reconstructed
> image could actually come from incorrect float comparison operations linked
> to this variable.
> I attached a corrected version which will hopefully solve your errors.
>
> Best regards, and thanks for helping exposing these bugs !
> Thibaut
>
>
>
>
>
> On 19/06/2017 17:50, niccolo camarlinghi wrote:
>
> Dear Thibaut,
>
> I'm still facing some issues using the castor version you sent me:
> I simulated with gate an uniform fdg filled cylinder and the PET scanner I
> sent in my previous email.
> I was able to reconstruct it using the following command
>
> >> ./castor-recon -df ~/prova_nick/UniformCylinder_CstrProj.Cdh -fout
> test_UniformCylinder -it 5:1
>
>  but the  image (you find in attachment) has some problem (see
> test_UniformCylinder_it5.png).
> I attached all the data I'm using to reconstruct this image:
>
> UniformCylinder_CstrProj.Cdf (you should be able to download it from my
> google drive )
> UniformCylinder_CstrProj.Cdh  (in attachment to this email)
> MyScanner.geom (the geometry file as produced by the castor version you
> sent me)
>
> I also wanted to ask you an explanation about the *"min angle difference
> parameter"*:
> is it evaluated using the crystal orientation or using the vector
> connecting the center of the crystal  with the center of the FOV?
>
> Best regards and thank for your support
>
> Niccolo' Camarlinghi
>
>
> ​
>  UniformCylinder_CstrProj.Cdf
> <https://drive.google.com/file/d/0B7mcgFkaQgk0a2RFdDZ6Rm81U00/view?usp=drive_web>
> ​
>
>
> --
> 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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