Coherent-scatter computed tomography applying a fan-beam geometry

Abstract

Recently, fan-beam geometry based Coherent Scatter Computed Tomography (CSCT) was proposed. Coherently scattered X-rays are used in order to reconstruct the spatial distribution of the material dependent structure function, allowing for superior tissue discrimination. In the present paper, the proposed 'third generation' CT geometry and acquisition scenario is simulated, taking into account effects like quantum noise and spectral smearing. A modified iterative algebraic reconstruction algorithm is used for reconstructing the structure function distribution from a number of two-dimensional projections acquired at different viewing angles. The visibility of small objects is investigated for several dose values. In addition to simulation studies, first results of an experimental fan-beam CSCT set-up are shown and discussed. Experiment and simulations indicate the feasibility of CSCT. Future investigations will deepen our understanding of the possibilities and limitations of this new imaging modality.