2014 Volume 17 Issue 3 Pages 159-164
The Compton camera technique is a novel method that enables us to estimate the direction of incident sub-MeV photons for each event without the collimator usually used in SPECT, and then to realize photon imaging. Some studies have constructed Compton camera systems using components such as a Si/CdTe semiconductor, or a CsI(T1) scintillator. In this technique, the photon source is reproduced by a superposition of back-projected rings in the 2D plane with the estimated scattering angle θ, but this degrades the spatial resolution in the reconstructed image. In this paper, we propose a novel reconstruction method for the Compton camera technique that is based on the filtered back projection algorithm used in computed tomography. We conducted reconstruction simulations assuming computed tomography and the Compton camera. We demonstrated that our proposed method drastically improves the spatial resolution of the Compton camera technique.