[Castor-users] Gate SPECT Reconstruction Projection Image .sin format.

[tmerlin]

Hi Kurt,


The GATE conversion functions in CASToR are restricted to ROOT output 
indeed. The detected singles are rebinned into pixels accordingly to 
their GlobalPosX/Y/Z root variables and the pixel matrix (set by the 
user). Also, the converter assumes parallel collimators are used. 
However, there are some functions in the code for the conversion of gate 
projections (.hdr/.sin), but there have not been thoroughly tested. I 
could send you a version of the code with these functions enabled if you 
want to give it a try.


CASToR's collimator models are quite simple and rely on the computation 
of focal points in order to draw lines of response during 
reconstruction. If I am not mistaken, with D-SPECT, the collimators 
could span different angles during acquisition while the detector 
remains static ? If the number of angles are fixed (not continuously 
moving), one workaround to make it work with CASToR would be to define 
as many heads as number of panels*number of sweep angles, and set 
different collimators models for each heads. The functions allowing to 
convert GATE data would require quite some modifications though.


I hope this helps


Best regards,

Thibaut



On 06/05/2020 06:42, Kurt V wrote:
>
> Dear Castor Users,
>
>
> I am a new user, inquiring about Castors capabilities with GATE MC.
>
>
> Ideally, I would like to model a dynamic spect (D-SPECT) system and 
> output a projection image (.sin and .hdr) from a volume source and 
> then reconstruct the projection image.
>
>
> Question 1)
>
> Is Castor capable of reconstructing a. sin and. hdr projection output 
> from a SPECT image from Gate?
>
> - I see a lot about root output but, I don’t believe this format is 
> useful for SPECT. It would be a .sin (projection) & .hdr (header).
>
>
> Question 2)
>
> Would a D-SPECT system be too tricky to reconstruct since it is 
> unconventional?
>
> -12 close panels sweeping, should I switch to a more traditional SPECT 
> type?
>
> Thanks all and I appreciate all suggestions,
>
> Kurt Van Delinder
>
>
>
> _______________________________________________
> Castor-users mailing list
> Castor-users at lists.castor-project.org
> http://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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