[Gate-users] source angle type

[Joon Young Suk]

Thanks Simon,

The two rod sources are confined in cylindrical shaped rods in a  
phantom, which is also cylindrical shaped. It doesn't show up clearly  
just because I set it as wire frame instead of solid volume for some  
reason. I used this confinement for the sources since the source will  
be moved during my simulation later.

Anyway, I think I found the problem. As shown in the part of macro, I  
set the geometry of sources, which is not necessary for this case  
because the sources have been confined with other geometrical volume.  
So, I got rid of the geometrical setting part for two sources and now  
the display also look much better than before. I'll post the result  
from this simulation later if the result doesn't look beautiful.

Best regards,
Joon Young

On 7-Dec-07, at 5:20 PM, Simon Stute wrote:

> Hi Joon,
>
> Display is just display, not very faithful ... Have you got the  
> same results in your root results (or other kind of output results) ??
> I don't see any attenuation volume in your display, did you build  
> some ?? Because the 'confine' macro command is usually used to fix  
> an 'activity volume' to a geometrical volume (assigned with a  
> material) that is moving during the simulation. You have defined  
> some cylindrical shape activity volume but in your display, its  
> look like that it is a point source 'volume'. What is your complete  
> macro file ?
>
> Cheers,
> Simon
>
> 2007/12/7, Joon Young Suk <joonyoung.suk at gmail.com>:
>>
>>>
>>> Hi all,
>>> I am trying to simulate the scan with a cylindrical phantom which  
>>> as two rod source inside.
>>> I built two rod sources with cylindrical geometry and set the  
>>> angle type as "iso".
>>> I think the LORs should be randomly distributed through all 4pi  
>>> angle, but the simulation doesn't look like that.
>>>
>>> From the display during the simulation, I can see most LORs are  
>>> lying horizontally on the centre plane.
>>>
>>> Please check the image from the followed link :
>>>
>>> http://www.joonyoung.net/iso.jpg
>>>
>>> Also, here is my code for the source part.
>>>
>>> Please, let me know what should I do to correct it and make real  
>>> isotropic emission.
>>>
>>> Thanks,
>>> Joon Young Suk
>>>
>>> # S O U R C E S
>>> /gate/source/addSource rodsource0
>>> ###################################################################
>>> /gate/source/rodsource0/setActivity {activity} becquerel
>>> /gate/source/rodsource0/setType backtoback
>>> /gate/source/rodsource0/gps/particle gamma
>>> /gate/source/rodsource0/gps/energytype Mono
>>> /gate/source/rodsource0/gps/monoenergy 0.511 MeV
>>> /gate/source/rodsource0/gps/type Volume
>>> /gate/source/rodsource0/gps/shape Cylinder
>>> /gate/source/rodsource0/gps/radius 0.5 mm
>>> /gate/source/rodsource0/gps/halfz 25.0 mm
>>> /gate/source/rodsource0/gps/centre {rod0Xposition} 0. 0. mm
>>> /gate/source/rodsource1/gps/angtype iso
>>> /gate/source/rodsource0/gps/confine rod0_P
>>>
>>> /gate/source/addSource rodsource1
>>> ###################################################################
>>> /gate/source/rodsource1/setActivity {activity} becquerel
>>> /gate/source/rodsource1/setType backtoback
>>> /gate/source/rodsource1/gps/particle gamma
>>> /gate/source/rodsource1/gps/energytype Mono
>>> /gate/source/rodsource1/gps/monoenergy 0.511 MeV
>>> /gate/source/rodsource1/gps/type Volume
>>> /gate/source/rodsource1/gps/shape Cylinder
>>> /gate/source/rodsource1/gps/radius 0.5 mm
>>> /gate/source/rodsource1/gps/halfz 25.0 mm
>>> /gate/source/rodsource1/gps/centre {rod1Xposition} 0. 0. mm
>>> /gate/source/rodsource1/gps/angtype iso
>>> /gate/source/rodsource1/gps/confine rod1_P
>>>
>>>
>>
>> Joon Young Suk
>> Brain Research Centre
>> Dept. of Physics,
>> University of British Columbia
>> 2211 Wesbrook Mall
>> Vancouver, British Columbia
>> Canada, V6T 2B5
>>
>> joon at physics.ubc.ca
>> joonyoung.suk at gmail.com
>>
>> http://www.joonyoung.net
>>
>>
>>
>>
>
>
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