[Gate-users] [BUG] FFDA - Displaced detector geometry and primary projections

Simon Rit simon.rit at creatis.insa-lyon.fr
Tue Mar 8 11:37:42 CET 2022

Hi Gabriele,
If something is set to 0, it is probably because your collimated source is
too small. Try adjusting the source size

On Tue, Mar 8, 2022 at 10:41 AM Gabriele Belotti <
gabriele.belotti.bergamo at gmail.com> wrote:

> Hello everyone,
> I'm posting this to inquire on a possible bug in GATE.
> I'm conducting some fixed forced detection simulations, with a voxelized
> phantom and a moving gantry described by an RTK .XML geometry file.
> The specific condition in my geometry file is that I have source and
> detector offsets.
> My simulation saves primary as well as attenuation images.
> BUG(?):
> When inspecting the primary images I have a vertical band of values that
> is consistently put to 0. The position of this band is on the same side of
> the detector offset (i.e. toward the center of the phantom being
> projected). At the same time, the attenuation images have no such issue and
> represent the complete projection consistently.
> I tried changing phantom and the issue was reproduced in the same way.
> While if I changed the RTK geometry to one with no offsets I get correct
> primary and attenuation images. I will try to find a culprit with
> further tests but I wanted to share this with you.
> PS: Issue reproduced in vGATE (GATE 9.1 and GEANT4 10.7) and on a cluster
> (with GATE master and GEANT4 11.0)
> Gabriele Belotti
> _______________________________________________
> Gate-users mailing list
> Gate-users at lists.opengatecollaboration.org
> http://lists.opengatecollaboration.org/mailman/listinfo/gate-users
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.opengatecollaboration.org/pipermail/gate-users/attachments/20220308/d2cd2402/attachment.html>

More information about the Gate-users mailing list