<div dir="ltr">Hello Eric, <div> </div><div>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"</div><div>in <a href="https://github.com/OpenGATE/Gate/blob/develop/source/digits_hits/src/GateDoseActor.cc">https://github.com/OpenGATE/Gate/blob/develop/source/digits_hits/src/GateDoseActor.cc</a>). </div><div> </div><div>If you increase the nb of interfaces (whatever the marerial), you have additional Geant4 steps, so potentially more NbOfHits.</div><div> </div><div>David</div><div> </div><div> </div></div><div class="gmail_extra"> <div class="gmail_quote">On Tue, Jan 19, 2016 at 12:37 PM, Eric Moszczynski <<a href="mailto:eric.moszczynski@hotmail.fr" target="_blank">eric.moszczynski@hotmail.fr</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> <div dir="ltr"> <div style="font-size:12pt;color:#000000;background-color:#ffffff;font-family:Calibri,Arial,Helvetica,sans-serif"> 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. </div> </div> _______________________________________________ Gate-users mailing list <a href="mailto:Gate-users@lists.opengatecollaboration.org">Gate-users@lists.opengatecollaboration.org</a> <a href="http://lists.opengatecollaboration.org/mailman/listinfo/gate-users" rel="noreferrer" target="_blank">http://lists.opengatecollaboration.org/mailman/listinfo/gate-users</a> </blockquote></div> <div> </div>-- <div class="gmail_signature"><div dir="ltr"><div><div dir="ltr">David Sarrut, Phd Directeur de recherche CNRS CREATIS, UMR CNRS 5220, Inserm U1206<div>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 <a href="http://www.creatis.insa-lyon.fr/~dsarrut" target="_blank">http://www.creatis.insa-lyon.fr/~dsarrut</a> _________________________________</div><div> "2 + 2 = 5, for extremely large values of 2" _________________________________</div></div></div></div></div> </div>