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Question variance reduction technique to recduce runtime 

Keywords: variance reduction
Forum: Hadronic Processes
Date: 04 Dec, 2007
From: Reema <Reema>

Hi all,

I am simulating a cone beam Computed Tomography system in geant4. I need to use 15 billion photons per projection angle. So in order to reconstruct an image image I will need to do 100 such projection angles. I was wondering if anyone can suggest any variance reduction technique to reduce the runtime.

Also, I was wondering if it is possible to force the particles to scatter (with Compton or Rayleigh interaction), such that none of the photons do transportation, and all scatter.

Thanks in advance! Best regards, Reema

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