[Gate-users] back-to-back gamma source

[Seb]

Hi Eunsin,
Please use this new class in the folder /source/physics/src to correct 
this bug.
We will provide an official patch ASAP.
Regards
Seb JAN

> Dear Users,
>
> I simulated a cylindrical PET system using point source (back-to-back gamma) at the center of the detector for a simple study..(with cylindrical phantom filled with just air).
> If my understanding is correct, coincidence events should have back-to-back gamma's, which tell us LOR in r-z plane should be simply a line passing through the center (0,0). In other words Z1+Z2 should be very close to zero. Below shows actual z position detected for two gammas in each coincidence events in my simulation output. Looks like something else is going on...
> Can anybody tell me what's missing?
>
> 	    Z1                    Z2
> 	-71.3593	46.7426
> 	-71.5756	-50.5808
> 	-71.5233	69.8813
> 	-71.004		35.5772
> 	-71.9038	15.7994
> 	-73.7647	-4.99394
> 	-71.5314	-11.8862
> 	-70.284		-12.6473
> 	-73.0036	63.4071	0	
> 	-71.3191	61.7319	0	
> 	-71.9782	-12.7522
> 	-72.9756	-68.4205
> 	-73.9974	39.802
> 	-73.1717	2.25218
> 	-71.4347	-44.9677
> 	-71.7795	-73.2273
> 	-70.6986	-19.3314
> 	-73.6817	-7.85506
> 	-73.5097	-1.3274
> 	-70.4753	54.6905
>
> Thanks,
> Eunsin
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> Gate-users at lists.opengatecollaboration.org
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>   

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