Compton scatter tomography in TOF-PET.

In this study, a novel approach is proposed to reconstruct activity distribution using the scattered data on the PET system. For each single scattering coincidence, scattering angle can be determined by recorded energy of the detected photons and then possible locations of scattering can be calculated based on the scattering angle. Geometry equations show that these sites lie on two arcs in 2D mode or surface of a prolate spheroid in 3D mode passing through the pair detector elements. The proposed method uses a novel and flexible technique to estimate source origin locations from the possible scattering locations using the TOF information. Evaluations were based on Monte Carlo simulation of uniform and non-uniform phantoms at different resolutions of time and detector energy. The results show that although the energy uncertainties deteriorate image spatial resolution in the proposed method, but the time resolution has more impact on image quality than energy resolution. With progress of TOF system, the reconstruction using the scattered data can be used as complementary or to improve image quality in the next generation of PET systems. PMID: 28749378 [PubMed - as supplied by publisher]
Source: Physica Medica - Category: Physics Authors: Tags: Phys Med Biol Source Type: research
More News: PET Scan | Physics | Study