Optimizing Compton camera performance
Abstract
Amore realistic simulation approach is used to study the behavior of the Compton camera in this thesis than previous studies to date. The Compton camera differs from gamma cameras in that the collimator is replaced by a detector known as the ‘scatterer’. Gamma rays may be Compton scattered in the scatterer and subsequently detected by an ‘absorber’ which is the equivalent of the detector in a gamma camera. By measuring the energies and the positions of the points on the scatterer and the absorber where the incident and scattered gamma rays interacted with the detectors, an image of the source can be reconstructed. Because there is no collimator present, the potential sensitivity of the Compton camera is much higher than the gamma camera, resulting in reduced acquisition times. Most of the work described in this thesis was done with the GEANT4 Monte Carlo simulation software. GEANT4 has been proven to be very robust and efficient in modelling physics problems of radiation transport and interactions with matter in complex geometries. Four major studies are carried out to estimate and optimize the performance of this novel equipment. The first study takes a look at the scatterer’s imaging parameters with the aim of prescribing an optimal scatterer material and geometry. In the second study, the contribution of the absorber to the overall Compton camera performance is evaluated, considering detector material, interaction type and geometry. The third study explores the…
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