[Gate-users] 答复: Gate-users Digest, Vol 34, Issue 4

[WuGuocheng]

Hi Hongwei,
I also encountered this problem before,  but I can't find the problem, so I
attached my macro to help, finally find that the process of physics define
error. So, if you haven't resolve the problems, maybe you can attached your
macros. And all the gate users will check them for you. 

Good luck.
----------------------------------------------------------------------
Guocheng Wu
Software Department
Neusoft Positron Medical Systems Co.,Ltd.
No.2 Xin Xiu Street, Hun Nan New District, Shenyang 110179, PRC
Tel: (86 24) 836 61980
Fax: (86 24) 836 61796
Mobile: 13604039065
Email: wuguocheng at neusoft.com
Website: http://medical.neusoft.com
----------------------------------------------------------------------

Dear GATE group and users,

I found a wield thing when I simulated a LYSO-based PET system: the line
source is put out of FOV and inside a polyethylene cylinder. The purpose of
this simulation is to find how many scatters come from the source outside
FOV.

However, some true coincidences (about 1.5%) were found!! I have checked
their annihiliation positions using ASCII output and they indeed came from
the line source. If I connected two detecors using a line, annihilations
CANNOT locate on this line ( not even close to). One example is given below.
If you just checked Z positions and you can find the problem: 2.181e+02 for
annihilation, 7.711e+01 for one single, and 1.479e+02 for another single.
And NO scattering happens before photons entered the detectors.


0  608372     0 9.598e-01 -4.609e+01 2.181e+02 4.68951501753163224606169e+00
6.184e-01 -3.021e+02 -3.291e+02 7.711e+01     0    30     0     0   791
0      0     1     0     0 0.000e+00 0.000e+00       

0  608372     0 9.598e-01 -4.609e+01 2.181e+02 4.68951501764343259281986e+00
4.892e-01 4.002e+02 1.912e+02 1.479e+02     0     3     0     0  1026     0
0     0     0     0 0.000e+00 0.000e+00

Could anyone give explainations for this??  Thank you very much.


Regards,
Hongwei


      
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