[Gate-users] SPECT projection artifact

[Ane Etxebeste]

Hi all,

I have found the same type of artifact in SPECT projections as Miriam 
did a while ago. You can find attached a screenshot of a projection for 
a centered  point-like source at a certain distance of a SPECT detector 
head (Gate version 9.2). Counts on the left side are accumulated in the 
upper left part of the image, they can be seen as a white horizontal line.

Has anyone faced this before and can shed some light on the issue?

Thanks!

Best regards,

Ane



On 20/08/2020 01:57, Miriam Dixon wrote:
> Hi Gate-Users,
>
> I am running SPECT simulations in GATEv9.0, collecting the output as 
> .sin projection files. I am curious if anyone recognises, and knows 
> the cause of, the little line of counts that consistently appear in 
> the top left hand corner of my projection data? I have circled it in 
> yellow in the image attached.
> LineArtifact.PNG
> As far as I know it isn't a problem as it doesn't interfere with the 
> rest of my projection data, but I would be very interested to know if 
> anyone else has seen it.
>
> Cheers,
> Miriam
>
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> Gate-users at lists.opengatecollaboration.org
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