Re: [fluka-discuss]: Gamma index and accelerator setup - Two Problems for Comparing FLUKA and Eclipse

From: Stefan E. Mueller <stefan.mueller_at_hzdr.de>
Date: Wed, 14 Apr 2021 13:57:10 +0200 (CEST)

OK,

I am not an expert on medical applications nor on linear accelerators, but
just to add:

In FLUKA one can score DOSE in GeV/g and "to obtain dose in Gy, multiply
GeV/g by 1.602176462E-7" (from the FLUKA manual, USRBIN entry, footnote 5).

Not sure if this helps for this particular application.

For defining geometry, source terms, energy thresholds etc., information
can be found at the websites of the FLUKA courses

http://www.fluka.org/fluka.php?id=courses&sub=ALL

          Stefan

--
Stefan E. Mueller
Department of Information Services and Computing - Computational Science
and Institute of Radiation Physics
Helmholtz-Zentrum Dresden-Rossendorf
Tel: +49 (0351) 260 3847
Stefan.Mueller_at_hzdr.de
http://www.hzdr.de
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On Tue, 13 Apr 2021, Mauro Valente wrote:
> Dear Simon,
> 
> Although I am a customary FLUKA user, not an expert, I may share with you my
> point of view about your question, because I faced exactly the same issue
> when trying to compare MC with experimental or calculated dosimetry data.
> 
> As far as I know (FLUKA expert advice should be considered) FLUKA does not
> perform gamma index calculation. Nonetheless, the common practice is to
> calculate DTA, dose differences and gamma index by independent means
> (python/matlab home-made scripts, for example).
> 
> About your question " Is there a way to convert the unit from FLUKA for
> DOSE-EQ (pSv/primary) to Gray? - and when please give some hints how to do
> it" I may suggest (please, refer & wait for a FLUKA expert advice) to use
> your beam current (particles per unit time) to assess a dose rate
> normalization.
> 
> Regarding your other question "How do we setup an accelerator in FLUKA? We
> need the same accelerator in FLUKA as we use in Eclipse." please let me
> comment that FLUKA is not a TPS, it is a general purpose Monte Carlo main
> code. The "logic" behind radiation sources/equipment definition is rather
> different for TPS and MC codes. When using MC codes you may assess
> complete/full radiation transport, hence higher representation accuracy, at
> least a priori. But, there is work necessary to define the radiation source.
> It is worth mentioning that in the particular case of clinical linacs, there
> are some available phase state files representing different linacs, you may
> be interested in aimed at saving time & efforts during the simulation
> configuration.
> 
> Hope this help,  
> 
> Regards,
> 
> Il giorno mar 13 apr 2021 alle ore 16:26 Simon Börger
> <simon.boerger_at_tu-ilmenau.de> ha scritto:
>
>       Dear FLUKA experts,
>
>       we wanna compare Dose Distributions from FLUKA and Eclipse from
>       Varian. But the programms use different units for the dose
>       distributions - FLUKA in pSv/primary and Eclipse in Gray. We
>       decided to calculate the gamma index of each distribution and
>       compare the dose distributions over the gamma index. We have
>       actually two problems:
>
>       1.) How do we calculate the gamma index in FLUKA?  Is there any
>       way? and when what are the steps of this way?
>
>       1.1) Is there a way to convert the unit from FLUKA for DOSE-EQ
>       (pSv/primary) to Gray? - and when please give some hints how to
>       do it
>
>       2.) How do we setup an accelerator in FLUKA? We need the same
>       accelerator in FLUKA as we use in Eclipse.
> 
>
>       Many thanks for any help
>
>       Best regards
>
>       Simon Börger
> 
> 
> 
> 
> 
> 
> --
> 
> 
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> 
>                                                 Prof. Mauro Valente, PhD.
> 
>                                                          Medical Physics
> 
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Received on Wed Apr 14 2021 - 15:58:30 CEST