[Gate-users] Materials.xml collaboration !
Samuel BURG
samuel_burg at yahoo.fr
Mon Jan 14 20:08:48 CET 2008
Hi all,
here's a fixed version, after the great help of
J.VanderLaan.
So my RESOLUTIONSCALE question is closed.
But ... I have not find anything interesting about
ABSLENGTH for now.
Many thanks,
Samuel Burg
--- D.J.vanderLaan at IRI.TUDELFT.NL a écrit :
> Hi Samuel,
>
> I had another look at the equations, but as far I
> can see the equations in
> the manual are correct.
>
> The standard deviation in the number of optical
> photons generated by the
> scintillation event N at E is given by:
> s = RS*sqrt(N at E),
> with N at E = E * SY. Using this in the equation for
> the energy resolution:
> R at E = FWHM at E/N at E = 2.35*s/N at E
> = 2.35*RS*sqrt(N at E)/N at E
> = 2.35*RS/sqrt(N at E)
> From which the resolution scale can be derived:
> RS = R at E*sqrt(N at E)/2.35
>
> Using the following numbers for LSO:
> SY = 26000 1/MeV
> R at 511 = 0.09 (this is the value used in the
> Materials.xml file)
> E = 0.511 MeV
>
> Gives
> RS = 0.09*sqrt(26000*0.511)/2.35 = 4.41
>
>
>
> Regards,
> Jan
>
>
>
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