[gate-users] WARNING : positron found and photonID vector size:1

[Mutanga Theodore]

Hi Jin,
I did as you suggested and I still had some warnings, maybe I have to set
some electron range cuts instead ?
What do you think ?
Has anyone been doing measurements in air ?
Theo



> That is because of the much longer positron range in air, which is about
> 170 cm for F18. But the average range in water is only 0.06 cm (F18). If
> you can use a small water sphere to hold your source, it may help to
> stop the warning message.
>
> Jin
>
> Mutanga Theodore wrote:
>
>>Hello Gaters,
>>
>>I had a setup for simulating and measuring the resolution of the
>>scanner,since the measurements had to be done in Air, I defined a phantom
>>which is a cylinder the same size as the inner diamter of the scanner.
>>
>>When I set the material as Air I have this warning messages
>>
>>:[GateTrajectoryNavigator::FindAnnihilationGammasTrackID]  WARNING :
>>positron found and photonID vector size: 1
>>
>>I don't really know what this means but when I use Water as the medium in
>>the phantom I don't get this error , how does it affect my simulation ?
>>
>>Cheers
>>
>>Theodore
>>
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>>
>
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