[Gate-users] could anyone send me a macro file for scatter fraction?

[WuGuocheng]

Hi Hongwei

         I think there is no any problem in your macro file, if you set the source in the FOV, you will find the result is acceptable.

 

 

 

Best wishes

----------------------------------------------------------------------

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:  <mailto:wuguocheng at neusoft.com> wuguocheng at neusoft.com

Website:  <http://medical.neusoft.com> http://medical.neusoft.com

----------------------------------------------------------------------

 

发件人: Hongwei Ye [mailto:howellye at yahoo.com] 
发送时间: 2009年3月7日 4:11
收件人: WuGuocheng
抄送: gate-users at lists.healthgrid.org
主题: Re: Gate-users Digest, Vol 34, Issue 4

 

Hi, Guocheng,

Thank you very much for your response.

I'm not sure if I made the same mistake as you. I have changed the library of physical process from "standard" to "lowenergy" but the same thing happened. So I guess that is not the problem. 

I attached my macro file for all GATE users to review. If you find anything wrong (or suspicious), please let me know.

Thanks a lot.

 

Hongwei

 

 

  _____  

From: WuGuocheng <wuguocheng at neusoft.com>
To: howellye at yahoo.com
Cc: gate-users at lists.healthgrid.org
Sent: Thursday, March 5, 2009 7:24:10 PM
Subject: 答复: Gate-users Digest, Vol 34, Issue 4

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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