Simulations and experimental feasibility study of fan-beam coherent-scatter CT

Adrian Harding; Jens-Peter Schlomka; Geoffrey L. Harding

doi:10.1117/12.454818

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26 November 2002 Simulations and experimental feasibility study of fan-beam coherent-scatter CT

Adrian Harding; Jens-Peter Schlomka; Geoffrey L. Harding

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Proceedings Volume 4786, Penetrating Radiation Systems and Applications IV; (2002) https://doi.org/10.1117/12.454818
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

Abstract

Fan-beam coherent scatter computer tomography (CSCT) has been employed to obtain 2-dimensional images of spatially resolved diffraction patterns in order to supplement CT images in material discrimination. A Monte Carlo simulation tool DiPhoS (Diagnostic Photon Simulation) was used to create 2-dimensional scatter projection data sets of high-contrast water and Lucite phantom objects with plastic inserts. The results were used as input to a reconstruction routine based on a novel simultaneous iterative reconstruction technique (SIRT). At the same time an experimental demonstrator was assembled to confirm the simulations by measurements and to show the feasibility of coherent scatter CT. It consisted of a 4.5kW constant power X-ray tube, a rotatable object plate and a vertical detector column that could be panned around the object. Spatial resolution was ensured by mechanical collimation. Phantoms similar to those simulated were measured and reconstructed and the contrast achieved by CSCT between the materials under examination substantially exceeded that achieved in CT. A further step was taken by examining an animal tissue sample in the same way, the results of which show remarkable contrast between muscle, cartilage and fat, suggesting that CSCT can also be used in a medical scenario.

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Adrian Harding, Jens-Peter Schlomka, and Geoffrey L. Harding "Simulations and experimental feasibility study of fan-beam coherent-scatter CT", Proc. SPIE 4786, Penetrating Radiation Systems and Applications IV, (26 November 2002); https://doi.org/10.1117/12.454818

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