[Gate-users] X-ray energy spectrum as GPS in Gate

[Simon Rit]

Hi Daniel,
The spectrum is normalized by Gate to obtain a probability distribution.
For every new primary photon, Gate randomly chose a photon energy according
to this PDF. So only the relative importance of the numbers matter, their
unit does not.
You may want to chose a number of primaries in your simulation to simulate
a given irradiation. For this, I suggest to integrate the SpekCalc spektrum
for given distance, mA and ms settings, this should give you the total
number of primaries. Another option is to chose the number of primaries to
reach a given dose (see eq 2 in https://doi.org/10.1002/mp.12448).
Best regards,
Simon

On Fri, Dec 8, 2017 at 5:15 AM, Daniel J Sandoval <DJSandoval at salud.unm.edu>
wrote:

> Hello Simon,
>
>
>
> I am attempting a project where I simulate a spectrum using SpekCalc and
> then run it in GATE. I stumbled upon the below message, and am truly
> grateful for your script. However, I do not quite understand what it is
> doing to the fluence. In your example, for the first line, you have an
> energy of 0.012 MeV, and a fluence of 2.591082e-126. However, when I create
> a sample spectrum of 120kev, my first line has an energy of 0.012MeV, but a
> fluence of 0.2479699. I have tried to look into the GATE manual to see what
> it expects for units of fluence, but have been unsuccessful.
>
>
>
> If you could please help me understand what units the fluence are for GATE
> it would be greatly appreciated.
>
>
> Thank you,
>
>
>
> Daniel
>
>
>
>
>
> Hi,
>
>
>
> I have written the enclosed script to convert a SpekCalc output to a
>
> Gate macro. It produces a file like
>
>
>
> https://github.com/OpenGATE/GateContrib/blob/master/imaging/CT/fixedForcedDetectionCT/mac/120keV.mac
>
>
>
> The output macro file can be called like in
>
>
>
> https://github.com/OpenGATE/GateContrib/blob/master/imaging/CT/fixedForcedDetectionCT/mac/fixedForcedDetectionCT.mac#L73
>
>
>
> Simon
>
>
>
>
>
> On 14/05/2017 13:10, Emmanuel Marfo wrote:
>
> >
>
> >* Hi Sir,*
>
> >
>
> >* Please am a beginner trying to use Gate to do my simulations as part *
>
> >* of my thesis. So far I have been learning Gate v7.2 user guide. I want *
>
> >* to use x-ray energy spectrum from SpekCalc as GPS in my simulation but *
>
> >* don't know how to go about it and the explanation in the user guide is *
>
> >* hard to understand. Can anyone help or suggest any way I could do *
>
> >* this. Thanks*
>
> >
>
> >* Best regards,*
>
> >
>
> >* Emmanuel Marfo*
>
> >
>
> >* Student*
>
> >
>
> >* University of Otago*
>
> >
>
> >
>
> >
>
> >* _______________________________________________*
>
> >* Gate-users mailing list*
>
> >* Gate-users at lists.opengatecollaboration.org <http://lists.opengatecollaboration.org/mailman/listinfo/gate-users>*
>
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>
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