[Gate-users] Gate: phase-space files

David Sarrut David.Sarrut at creatis.insa-lyon.fr
Mon Dec 28 18:48:12 CET 2015

Hi Nick !

First, the IAEA format is not the primary file format for phase-space. Some
times ago, bugs were reported for this format. It should now be corrected
in develop version, but other limitations still probably exist (I do not
use it, so cannot guide you). I recommend to use root file format instead.

Second, yes the output is in Gy, not in Gy/primary. While it could be
natural for radiotherapy applications, DoseActor are used in other
applications where the primary is not necessarily meaningful. For RT
applications, you can just for example add a SimulationStatistics actor and
look for the number of primaries that have been simulated to normalize,
nothing complicated here.


On Mon, Dec 28, 2015 at 6:12 PM, REYNAERT NICK <n-reynaert at o-lambret.fr>

> Hi,
> I've recently started using Gate for radiotherapy applications. There is
> something that I don't really understand regarding the usage of phase-space
> files.
> First of all when a phase-space file is generated in IAEA format, the
> number of primary histories is not correctly written in the .IAEAheader
> file. Obviously this can be corrected manually. But when a phantom
> calculation uses this phase-space file as a source, this info does not seem
> to be used and the dose is wrongly (or not at all) normalized.
> The output is in Gy, instead of the more conventional Gy/primary_history.
> The fact that a history is a primary is saved in the phase-space file and
> this info is normally used by a MC engine to normalize the dose correctly
> (this is e.g. the case in Gamos as well). I think this is mandatory if the
> Monte Carlo system is going to be used for absolute treatment plan
> validation. So I was wondering if I have overlooked something, or how
> others perform this normalization in Gate ?
> Many thanks in advance !!!
> Nick
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David Sarrut, Phd
Directeur de recherche CNRS
CREATIS, UMR CNRS 5220, Inserm U 1044
Centre de lutte contre le cancer Léon Bérard
28 rue Laënnec, 69373 Lyon cedex 08
Tel : 04 78 78 51 51 / 06 74 72 05 42
 "2 + 2 = 5,  for extremely large values of 2"
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