[Gate-users] Artefact in Interfile output

[Albert Hirtl]

Dear Gate-users,

We are somewhat stuck :-) . We are trying to simulate a two-headed 
SPECT-system with a very simple (cylindrical) water phantom inside. The 
source is a gamma emitter with 140 keV. In principle things are fine, 
however, there are some artefacts (?) in the interfile output. If you 
please have a look at the attached image (need to zoom a little), you 
see  some lines in the slices 9 and 73 (these are opposing SPECT-heads), 
which I do not understand. They also appear at other slices (29-93, 
47-111, 59-123). Since these lines always occur in pairs, their origin 
must probably be in the source somewhere. Has anybody ever seen such a 
behaviour?

I also attached the relevant mac-files, maybe it is some trivial mistake 
in one of the mac files. Any help would very much be appreciated!

Cheers,
Albert

-- 
Medizinische Universität Wien - Allgemeines Krankenhaus Wien
Universitätsklinik für Nuklearmedizin
Währinger Gürtel 18-20
1090 Wien
Austria

Tel.: +43 (0) 1 / 40400 5545

Web:
http://www.meduniwien.ac.at/user/albert.hirtl
http://www.meduniwien.ac.at/moccamed/
http://www.meduniwien.ac.at/nuklear/forschunglehre/physik/index.html

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