[Castor-users] castor-GATEMacToGeom/GATERootToCastor questions

[tmerlin]

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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