[Gate-users] Why the time difference has asymmetry shape?

[주요한]

Dear Gate users.

 

I create a new PET system follows the Gate user manual. (my gate version is
6.2)

 

Actually I try to do the simulation with point source, the result image
shows a point also. 

 

And sinogram is also good.

 

However, the time difference histogram is not common things.

 

I attached it as image files in this e-mail.

 

In real system, the random part of time histogram has a symmetry
distribution. 

 

However it has asymmetry distribution in the simulation.

 

Which part makes this?

 

If you know or guess, please let me know. I want to fix it.

 

Here is associated script..

 

Thank you.

 

 

/gate/digitizer/Singles/insert timeResolution 

/gate/digitizer/Singles/timeResolution/setTimeResolution 2.1 ns 

 

/gate/digitizer/Singles/insert deadtime

/gate/digitizer/Singles/deadtime/setDeadTime 3000000. ps

/gate/digitizer/Singles/deadtime/setMode nonparalysable

/gate/digitizer/Singles/deadtime/chooseDTVolume level1

 

/gate/digitizer/name Coincidences

/gate/digitizer/insert coincidenceSorter

/gate/digitizer/Coincidences/setInputName Singles

/gate/digitizer/Coincidences/setWindow 20. ns

/gate/digitizer/Coincidences/setOffset 0. ns

/gate/digitizer/Coincidences/describe

 

/gate/digitizer/name delay

/gate/digitizer/insert coincidenceSorter

/gate/digitizer/delay/setWindow 20. ns

/gate/digitizer/delay/setOffset 500. ns

/gate/digitizer/delay/describe

 

/gate/digitizer/name finalCoinc

/gate/digitizer/insert coincidenceChain

/gate/digitizer/finalCoinc/addInputName delay

/gate/digitizer/finalCoinc/addInputName Coincidences

/gate/digitizer/finalCoinc/usePriority true

/gate/digitizer/finalCoinc/describe

 

 

Best Regards,

Yohan

 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.opengatecollaboration.org/mailman/private/gate-users/attachments/20140826/2050090e/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: TDH.jpg
Type: image/jpeg
Size: 13940 bytes
Desc: not available
URL: <http://lists.opengatecollaboration.org/mailman/private/gate-users/attachments/20140826/2050090e/attachment-0001.jpg>