[Gate-users] measurement of random coincidences

[Ville-Veikko Wettenhovi]

Hi,

An alternative method is to compare the event IDs as random coincidences originate from different events and, as such, have different event IDs. You can find the code I've used here:
https://github.com/villekf/OMEGA/blob/master/source/GATE_root_matlab_C.cpp#L35

Regards,
Ville-Veikko Wettenhovi
________________________________
From: Gate-users <gate-users-bounces at lists.opengatecollaboration.org> on behalf of Meysam Dadgar <meysamdadgar10 at gmail.com>
Sent: Saturday, June 20, 2020 19:21
To: Hadi Rezaei <hrezaei.m.ph at gmail.com>
Cc: gate-users at lists.opengatecollaboration.org <gate-users at lists.opengatecollaboration.org>
Subject: Re: [Gate-users] measurement of random coincidences

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<https://eur03.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.opengatecollaboration.org%2FMaterials2015%2FPracticalExercises2015%2FVoxelizedSources%26Phantoms&data=02%7C01%7C%7Cdd661ac863de4defb58a08d815360c36%7C87879f2e73044bf2baf263e7f83f3c34%7C0%7C0%7C637282669160504092&sdata=kuZukksv8TqCPdm91R5C8Vp6Da1Bhcht9p5Y6lyHM9o%3D&reserved=0>

Best regards
MD

On 20 Jun 2020, at 18:03, Hadi Rezaei <hrezaei.m.ph at gmail.com<mailto: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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