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Proceedings Paper

Scatter correction for cone-beam computed tomography using simulated object models
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Paper Abstract

Scattered radiation is a major source of artifacts in flat detector based cone-beam computed tomography. In this paper, a novel software-based method for retrospective scatter correction is described and evaluated. The method is based on approximation of the imaged object by a simple geometric model (e.g., a homogeneous water-like ellipsoid) that is estimated from the set of acquired projections. This is achieved by utilizing a numerical optimization procedure to determine the model parameters for which there is maximum correspondence between the measured projections and the projections of the model. Monte-Carlo simulations of this model are used for calculation of scatter estimates for the acquired projections. Finally, using the scatter-corrected projections, tomographic reconstruction is conducted by means of cone-beam filtered back-projection. The correction method is evaluated using simulated and experimentally acquired projection data sets of geometric and physical head phantoms. It is found that the method is able to accurately estimate mean scatter levels in X-ray projections, allowing to significantly reduce scatter-caused artifacts in 3D reconstructed images.

Paper Details

Date Published: 2 March 2006
PDF: 12 pages
Proc. SPIE 6142, Medical Imaging 2006: Physics of Medical Imaging, 61421C (2 March 2006); doi: 10.1117/12.651027
Show Author Affiliations
Matthias Bertram, Philips Research Labs. (Germany)
Jens Wiegert, Philips Research Labs. (Germany)
Georg Rose, Philips Research Labs. (Germany)
Otto-von-Guericke Univ. (Germany)

Published in SPIE Proceedings Vol. 6142:
Medical Imaging 2006: Physics of Medical Imaging
Michael J. Flynn; Jiang Hsieh, Editor(s)

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