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

[Fernando Rannou]

Hi Seb
So it is not a matter of scatter?
It is quite normal for back-to-back produce
that kind of behavior.

Fernando

Seb wrote:
> 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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>>   
>
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