[Gate-users] possibility for getting pencil beam from back to back source

[Simon Stute]

Hi,

By saying "it does'nt work", could you please just say what is really
happening ?
Because otherwise there is no other way (than using angles) to do this in
GATE.

You will have to first correctly place your point source using macros
(somewhere on the LOR that you want to hit) and then force the momentum of
the emmited particles to be that you want, directly in the source code
(GateSource.cc in GATE before v6 and GateVSource.cc in GATE v6).

Good luck !
Simon

On Sat, Jul 3, 2010 at 6:50 AM, Nafise Ghazanfari <
nafisse.ghazanfari at gmail.com> wrote:

> Dear gate-users,
>  I want to know, Is it possible in the GATE to have pencil beam from
> back-to-back source for PET, because I have a pixelated PET and want to
> irradiate just one pixel (and the same one in the opposite side for having
> coincidence) along the x-axis, I have used following commands but it dose
> n'
> t work.Any kind of information is appreciated
>
> /gate/source/addSource twogamma
> /gate/source/twogamma/setActivity 100000. becquerel
> /gate/source/twogamma/gps/particle gamma
> /gate/source/twogamma/setType backtoback
> /gate/source/twogamma/gps/centre 0.0 0.0 0.0 mm
> /gate/source/twogamma/gps/energytype Mono
> /gate/source/twogamma/gps/monoenergy 0.511 MeV
> /gate/source/twogamma/gps/type Volume
> /gate/source/twogamma/gps/type Point
> /gate/source/twogamma/gps/angtype iso
> /gate/source/twogamma/gps/mintheta 90.0 deg
> /gate/source/twogamma/gps/maxtheta 90.0 deg
> /gate/source/twogamma/gps/minphi 180.0 deg
> /gate/source/twogamma/gps/maxphi 180.0 deg
> /gate/source/twogamma/gps/confine NULL
>
>
>                Best regards
>             Nafise.Ghazanfari
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