[Gate-users] Question in simulation with a number of sources

[jinxia guo]

Hi,dear users,

Now I'am getting projection data with GATE4.0.0. In my mac file source.mac,
there are 9 point sources in different positions. I checked the sourceID
histogram with root and I found counts from a few sources are very low.
After recontruction,sources with low counts cat't be seen. My source.mac and
the sourceID histogram are as follows,Source 3 ,source 5,source 6,source
7,source 8,souce 9 seems no counts.I tried to use 6 Point sources,3 Point
sources and even 2 Point sources ,the result is similar. I don't why it's
so. Anyone knows about that? Hope your help. Thank you very much!

##########################Source One##########################
/gate/source/addSource twogamma
/gate/source/twogamma/setActivity 0.000001 Ci
/gate/source/twogamma/setType backtoback
/gate/source/twogamma/gps/particle gamma

/gate/source/twogamma/gps/energytype Mono
/gate/source/twogamma/gps/monoenergy 0.511 MeV

/gate/source/twogamma/gps/type Point
/gate/source/twogamma/gps/centre 0. 5. 0. mm

/gate/source/twogamma/gps/angtype iso

/gate/source/twogamma/gps/mintheta    90. deg
/gate/source/twogamma/gps/maxtheta    90. deg

/gate/source/twogamma/gps/minphi      0. deg
/gate/source/twogamma/gps/maxphi    360. deg

##########################Source Two##########################
/gate/source/addSource twogamma2
/gate/source/twogamma2/setActivity 0.000001 Ci
/gate/source/twogamma2/setType backtoback
/gate/source/twogamma2/gps/particle gamma

/gate/source/twogamma2/gps/energytype Mono
/gate/source/twogamma2/gps/monoenergy 0.511 MeV

/gate/source/twogamma2/gps/type Point
/gate/source/twogamma2/gps/centre 0. 5. 0. mm

/gate/source/twogamma2/gps/angtype iso

/gate/source/twogamma2/gps/mintheta    90. deg
/gate/source/twogamma2/gps/maxtheta    90. deg

/gate/source/twogamma2/gps/minphi      0. deg
/gate/source/twogamma2/gps/maxphi    360. deg

##########################Source Three##########################

/gate/source/addSource twogamma3
/gate/source/twogamma3/setActivity 0.000001 Ci
/gate/source/twogamma3/setType backtoback
/gate/source/twogamma3/gps/particle gamma

/gate/source/twogamma3/gps/energytype Mono
/gate/source/twogamma3/gps/monoenergy 0.511 MeV

/gate/source/twogamma3/gps/type Point
/gate/source/twogamma3/gps/centre 0. -5. 0. mm

/gate/source/twogamma3/gps/angtype iso

/gate/source/twogamma3/gps/mintheta    90. deg
/gate/source/twogamma3/gps/maxtheta    90. deg

/gate/source/twogamma3/gps/minphi      0. deg
/gate/source/twogamma3/gps/maxphi    360. deg

##########################Source Fourth##########################

/gate/source/addSource twogamma4
/gate/source/twogamma4/setActivity 0.000001 Ci
/gate/source/twogamma4/setType backtoback
/gate/source/twogamma4/gps/particle gamma

/gate/source/twogamma4/gps/energytype Mono
/gate/source/twogamma4/gps/monoenergy 0.511 MeV

/gate/source/twogamma4/gps/type Point
/gate/source/twogamma4/gps/centre 5. 5. 0. mm

/gate/source/twogamma4/gps/angtype iso

/gate/source/twogamma4/gps/mintheta    90. deg
/gate/source/twogamma4/gps/maxtheta    90. deg

/gate/source/twogamma4/gps/minphi      0. deg
/gate/source/twogamma4/gps/maxphi    360. deg

##########################Source Five##########################

/gate/source/addSource twogamma5
/gate/source/twogamma5/setActivity 0.000001 Ci
/gate/source/twogamma5/setType backtoback
/gate/source/twogamma5/gps/particle gamma

/gate/source/twogamma5/gps/energytype Mono
/gate/source/twogamma5/gps/monoenergy 0.511 MeV

/gate/source/twogamma5/gps/type Point
/gate/source/twogamma5/gps/centre 5. -5. 0. mm

/gate/source/twogamma5/gps/angtype iso

/gate/source/twogamma5/gps/mintheta    90. deg
/gate/source/twogamma5/gps/maxtheta    90. deg

/gate/source/twogamma5/gps/minphi      0. deg
/gate/source/twogamma5/gps/maxphi    360. deg

##########################Source Six##########################

/gate/source/addSource twogamma6
/gate/source/twogamma6/setActivity 0.000001 Ci
/gate/source/twogamma6/setType backtoback
/gate/source/twogamma6/gps/particle gamma

/gate/source/twogamma6/gps/energytype Mono
/gate/source/twogamma6/gps/monoenergy 0.511 MeV

/gate/source/twogamma6/gps/type Point
/gate/source/twogamma6/gps/centre 5. 0. 0. mm

/gate/source/twogamma6/gps/angtype iso

/gate/source/twogamma6/gps/mintheta    90. deg
/gate/source/twogamma6/gps/maxtheta    90. deg

/gate/source/twogamma6/gps/minphi      0. deg
/gate/source/twogamma6/gps/maxphi    360. deg

##########################Source Seventh##########################

/gate/source/addSource twogamma7
/gate/source/twogamma7/setActivity 0.000001 Ci
/gate/source/twogamma7/setType backtoback
/gate/source/twogamma7/gps/particle gamma

/gate/source/twogamma7/gps/energytype Mono
/gate/source/twogamma7/gps/monoenergy 0.511 MeV

/gate/source/twogamma7/gps/type Point
/gate/source/twogamma7/gps/centre -5. 0. 0. mm

/gate/source/twogamma7/gps/angtype iso

/gate/source/twogamma7/gps/mintheta    90. deg
/gate/source/twogamma7/gps/maxtheta    90. deg

/gate/source/twogamma7/gps/minphi      0. deg
/gate/source/twogamma7/gps/maxphi    360. deg

##########################Source Eighth##########################

/gate/source/addSource twogamma8
/gate/source/twogamma8/setActivity 0.000001 Ci
/gate/source/twogamma8/setType backtoback
/gate/source/twogamma8/gps/particle gamma

/gate/source/twogamma8/gps/energytype Mono
/gate/source/twogamma8/gps/monoenergy 0.511 MeV

/gate/source/twogamma8/gps/type Point
/gate/source/twogamma8/gps/centre -5. 5. 0. mm

/gate/source/twogamma8/gps/angtype iso

/gate/source/twogamma8/gps/mintheta    90. deg
/gate/source/twogamma8/gps/maxtheta    90. deg

/gate/source/twogamma8/gps/minphi      0. deg
/gate/source/twogamma8/gps/maxphi    360. deg

##########################Source Ninth##########################

/gate/source/addSource twogamma9
/gate/source/twogamma9/setActivity 0.000001 Ci
/gate/source/twogamma9/setType backtoback
/gate/source/twogamma9/gps/particle gamma

/gate/source/twogamma9/gps/energytype Mono
/gate/source/twogamma9/gps/monoenergy 0.511 MeV

/gate/source/twogamma9/gps/type Point
/gate/source/twogamma9/gps/centre -5. -5. 0. mm

/gate/source/twogamma9/gps/angtype iso

/gate/source/twogamma9/gps/mintheta    90. deg
/gate/source/twogamma9/gps/maxtheta    90. deg

/gate/source/twogamma9/gps/minphi      0. deg
/gate/source/twogamma9/gps/maxphi    360. deg

Best wishes,
Jinxia Guo

-- 

Jinxia.Guo
School of Life, Huazhong Univ. of Sci. & Tech.
Room 503, D11 Building
1037 Luoyu Road, Wuhan 430074, China
Tel & Fax:+86-27-8779-2294
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.opengatecollaboration.org/mailman/private/gate-users/attachments/20090421/4e81ef95/attachment.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: sourceID_histogram.png
Type: image/png
Size: 10556 bytes
Desc: not available
URL: <http://lists.opengatecollaboration.org/mailman/private/gate-users/attachments/20090421/4e81ef95/attachment.png>