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Question Electron track killing 

Keywords: steppingaction, parallel world, track killing
Forum: Medical Applications
Date: 17 Jan, 2008
From: <>

I'm currently working with version 4.9 on a simulation for radiotherapy treatment.
I'm using a ct dataset which is voxelized in the geant world using a parameterisation.
Aim is to run the simulation daily so i'm working on tricks to increase my simulation speed.
One of those trick is allowing electron tracks only inside a certain region of interest and 
killing them outside the ROI. Since the ct set is voxelized and each loaded set is different
i cannot specify a region in the real world. Therefore i constructed a parallel world with a box
volume which has to define my ROI.  

How can I make a steppingaction in where the electron tracks 
can check whether they are in the parallel box volume?

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