[Gate-users] Delayed coincidence window for randoms correction

[Ida Häggström]

Dear Gaters,
I'm trying to use a delayed window to estimate the randoms coincidences
but have not quite figured out how to do this yet.

Below I've attached part of my digitizer module where I've tried adding a
delayed window (delayedCoincidences) as well as a promt one (cutSingles). I
don't know if this is the correct way to do it? I use root output and want
to save both the delayed branch and prompt branch I guess... Can you
immediately (i.e. in GATE) subtract the randoms from the prompts (and later
rebin into a randoms corrected sinogram) or do you have to arrange the
randoms into one sinogram and the promts into another one and then perform
randoms correction?

Has anyone successfully added a delayed window and have some insight into
how it all works and how you need to set it up, and more importantly, how
you work with the root output?

Thanks for any suggestions!
Ida


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# C O I N C I    S O R T E R
/gate/digitizer/Coincidences/setInputName cutSingles
/gate/digitizer/Coincidences/setOffset 0. ns
/gate/digitizer/Coincidences/setWindow 6.25 ns
/gate/digitizer/Coincidences/describe

/gate/digitizer/name delayedCoincidences
/gate/digitizer/insert coincidenceSorter
/gate/digitizer/delayedCoincidences/setInputName cutSingles
/gate/digitizer/delayedCoincidences/setOffset 500. ns
/gate/digitizer/delayedCoincidences/setWindow 6.25 ns

# C O I N C I    S O R T E R   D E A D T I M E
/gate/digitizer/name finalCoinci
/gate/digitizer/insert coincidenceChain
/gate/digitizer/finalCoinci/addInputName delayedCoincidences
/gate/digitizer/finalCoinci/addInputName Coincidences
/gate/digitizer/finalCoinci/usePriority true

/gate/digitizer/finalCoinci/insert deadtime
/gate/digitizer/finalCoinci/deadtime/setDeadTime 332. ns
/gate/digitizer/finalCoinci/deadtime/setMode paralysable
/gate/digitizer/finalCoinci/deadtime/conserveAllEvent true