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Proceedings Paper

Simulations and experimental feasibility study of fan-beam coherent-scatter CT
Author(s): Adrian Harding; Jens-Peter Schlomka; Geoffrey L. Harding
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Paper 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.

Paper Details

Date Published: 26 November 2002
PDF: 8 pages
Proc. SPIE 4786, Penetrating Radiation Systems and Applications IV, (26 November 2002); doi: 10.1117/12.454818
Show Author Affiliations
Adrian Harding, Philips Research Labs. (Germany)
Jens-Peter Schlomka, Philips Research Labs. (Germany)
Geoffrey L. Harding, Philips Research Labs. (Germany)

Published in SPIE Proceedings Vol. 4786:
Penetrating Radiation Systems and Applications IV
H. Bradford Barber; Hans Roehrig; F. Patrick Doty; Lisa J. Porter; Edward J. Morton, Editor(s)

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