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

Matthias Bertram; Jens Wiegert; Georg Rose

doi:10.1117/12.651027

2 March 2006 Scatter correction for cone-beam computed tomography using simulated object models

Matthias Bertram, Jens Wiegert, Georg Rose

Proceedings Volume 6142, Medical Imaging 2006: Physics of Medical Imaging; 61421C (2006) https://doi.org/10.1117/12.651027
Event: Medical Imaging, 2006, San Diego, California, United States

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.

Citation Download Citation

Matthias Bertram, Jens Wiegert, and Georg Rose "Scatter correction for cone-beam computed tomography using simulated object models", Proc. SPIE 6142, Medical Imaging 2006: Physics of Medical Imaging, 61421C (2 March 2006); https://doi.org/10.1117/12.651027

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