[Gate-users] NbOfHits

[David Sarrut]

Hello Eric,

the "NbOfHits" is maybe badly named: it is the number of times a dose
deposition different from zero occurs in the attached volume, weighted by
the particle weight (see function "UserSteppingActionInVoxel"
in
https://github.com/OpenGATE/Gate/blob/develop/source/digits_hits/src/GateDoseActor.cc
).

If you increase the nb of interfaces (whatever the marerial), you have
additional Geant4 steps, so potentially more NbOfHits.

David



On Tue, Jan 19, 2016 at 12:37 PM, Eric Moszczynski <
eric.moszczynski at hotmail.fr> wrote:

> Hi gate users,
>
> I am using DoseActor and I use to enable the NumberOfHits. My problem is
> the following : I observed a increase of the number of hit when a interface
> between two volumes is met. It as an impact on the dose values.
>
> In my case, i have a volume of Air and a volume of water, my volumes are
> separated with empty space(vaccum) but I have still this issue.
>
>
> The NbOfHits file is returning something like this :
>
> Air-NbOfHits.txt
>
>
> ####################################
> # Matrix Size= (100,100,12.7)
> # Resol      = (1,1,10000)
> # VoxelSize  = (100,100,0.00127)
> # nbVal      = 10000
> ####################################
> 7177
> 3804
> 3198
> 3149
> 3041
> 3031
> 2902
> 2873
> 2851
> 2783
> 2727
> 2792
> 2635
> 2689
> ...
>
> 3119
> 3214
> 3203
> 3244
> 3210
> 3448
> 3555
> 3508
> 3808
> 3869
> 3961
> 4239
> 4195
> 4334
> 4536
> 4680
> 4873
> 5094
> 5480
> 5556
> 5897
> 6401
> 6752
> 7226
> 7789
> 8820
> 9531
> 11101
> 16205
> 61277
>
>
>
>
>
>  Water-NbOfHits.txt
>
>
>
> ####################################
> # Matrix Size= (100,100,0.1)
> # Resol      = (1,1,10000)
> # VoxelSize  = (100,100,1e-05)
> # nbVal      = 10000
> ####################################
> 24318
> 16180
> 15217
> 14737
> 14504
> 13996
> 13681
> 13616
> 13279
> 13387
> 13239
> 12871
>
> ...
>
> 11262
> 11683
> 12114
> 12744
> 13244
> 13685
> 14156
> 15025
> 15689
> 16407
> 17139
> 18123
> 18910
> 20575
> 22906
> 26920
> 35023
> 98842
>
>
>
>
>
>
>
> Do you have any ideas ?
> Thanks in advance.
>
> Best regards.
>
> _______________________________________________
> Gate-users mailing list
> Gate-users at lists.opengatecollaboration.org
> http://lists.opengatecollaboration.org/mailman/listinfo/gate-users
>



-- 
David Sarrut, Phd
Directeur de recherche CNRS
CREATIS, UMR CNRS 5220, Inserm U1206
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
http://www.creatis.insa-lyon.fr/~dsarrut
_________________________________
 "2 + 2 = 5,  for extremely large values of 2"
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