[Gate-users] measurement of random coincidences

Meysam Dadgar meysamdadgar10 at gmail.com
Sat Jun 20 18:21:35 CEST 2020

Dear Hadi
It is very general question but if you want to know if a coincidence is random or not, you should consider definition of random coincidences. If gamma quanta which has been detected within time window, are from different annihilation or different sources, we call them random coincidences. By this definition you can have a look to your trees to see if 2 gamma quanta emitted from same source position, then  the coincidence is true. If the source position for those gamma quanta are different, then they are random coincidences. For more information I suggest you have a look into this link :
http://www.opengatecollaboration.org/Materials2015/PracticalExercises2015/VoxelizedSources%26Phantoms <http://www.opengatecollaboration.org/Materials2015/PracticalExercises2015/VoxelizedSources&Phantoms>

Best regards

> On 20 Jun 2020, at 18:03, Hadi Rezaei <hrezaei.m.ph at gmail.com> wrote:
> Dear users 
> How do random coincidences obtain from ROOT object browser or anyway from root output?
> Thank you
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