GEANT4 simulation of a 3D Compton imaging device

A 3D brain imaging device based on Compton scattering is investigated with a GEANT4 Monte-Carlo simulation. The proposed device relies on a novel 3D imaging technique which, contrary to other approaches like Compton cameras, does not require any backprojection procedure. We study the attainable sensitivity in the detection of density variations as a function of the beam energy, the depth inside the object and size and density of the inclusions. At midbrain position a resolution of about 2 mm and a contrast of 12% are obtained. In addition the simulation indicates that a complete brain scan at 600 keV beam energy would result in an effective dose of about 1 mSv.