[Gate-users] The gateCoincidengces.dat is empty

[cindy Dong]

Hi Marlen,
  Thanks a lot for your help,but after i add
/gate/digitizer/Coincidences/minSectorDifference 1
it doesn't work either.I list part of my file,can you help me find what's
wrong with my system?

#SYSTEM
/gate/world/daughters/name PETscanner
/gate/world/daughters/insert box
/gate/PETscanner/setMaterial Air
/gate/PETscanner/geometry/setXLength 50. mm
/gate/PETscanner/geometry/setYLength 6. mm
/gate/PETscanner/geometry/setZLength 100. mm
/gate/PETscanner/placement/setTranslation 0 27.65 0 mm
/gate/PETscanner/vis/forceWireframe
/gate/PETscanner/repeaters/insert ring
/gate/PETscanner/ring/setRepeatNumber 2

# level1
/gate/PETscanner/daughters/name level1
/gate/PETscanner/daughters/insert box
/gate/level1/setMaterial Water
/gate/level1/geometry/setXLength 44 mm
/gate/level1/geometry/setYLength 5.3 mm
/gate/level1/geometry/setZLength 96.8 mm
/gate/level1/vis/setColor grey
/gate/level1/vis/forceWireframe

#level2
/gate/level1/daughters/name level2
/gate/level1/daughters/insert box
/gate/level2/geometry/setXLength 2.05 mm
/gate/level2/geometry/setYLength 5. mm
/gate/level2/geometry/setZLength 2.05 mm
/gate/level2/setMaterial BGO
/gate/level2/vis/setColor yellow
/gate/level2/vis/forceWireframe

#REPEAT  CRYSTAL
/gate/level2/repeaters/insert cubicArray
/gate/level2/cubicArray/setRepeatNumberX 20
/gate/level2/cubicArray/setRepeatNumberY 1
/gate/level2/cubicArray/setRepeatNumberZ 44
/gate/level2/cubicArray/setRepeatVector 2.2 0 2.2 mm

#ATTACH Volumes To a SYSTEM
/gate/systems/PETscanner/level1/attach level1
/gate/systems/PETscanner/level2/attach level2
/gate/level2/attachCrystalSD

Thanks a lot,
Cindy

2010/10/22 Marlen Priegnitz <m.priegnitz at fzd.de>

>
> Hi,
>
> if you simulate a double-head PET camera, be sure to set
>
> /gate/digitizer/Coincidences/minSectorDifference 1
> .
> The default is "2", this is the difference between the detectors that
> registered your coincidence. That means, a coincidence can not occur in 2
> detectors that are directly next to each other. For a fulring this is
> definitely reasonable, but for a double-head camera this does not work and
> has to be set to "1".
>
> Hope this helps.
>
> Kind regards,
> Marlen
>
>
>
>
>
> cindy Dong wrote:
>
>> Hi,
>>  I'm new to Gate.
>> I want to simulate a PET system which consists of two detector heads
>> facing
>> each other ,but the output is that it has gateCoincidences.dat
>> (/gate/output/ascii/setOutFileCoincidencesFlag 1)but it's empty,while
>> gateSingles.dat&gateHits.dat are filled.Why?Is it because that
>> gateCoincidences.dat has rsectorID,moduleID, submoduleID,crystalID while
>> the
>> flat panel scanner doesn't have such system geometry(I designed the
>> PETscanner consists of level1,level2)? If that,how should i design the
>> flat
>> panel to get the coincidences information?
>> Thanks for your help,
>> Cindy
>> _______________________________________________
>> Gate-users mailing list
>> Gate-users at lists.opengatecollaboration.org
>> http://lists.opengatecollaboration.org/mailman/listinfo/gate-users
>>
>
> --
> Marlen Priegnitz             |  Forschungszentrum Dresden-Rossendorf
> Tel. : 0351/260 3307         |
> Fax  : 0351/260 3700         |  Postfach 510119
> Email: m.priegnitz at fzd.de    |  D-01314 Dresden
> ------------------------------------------------------------------------
>
>