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Biomedical Engineering and Bioengineering Commons

Open Access. Powered by Scholars. Published by Universities.®

2013

Computed tomography

Bioimaging and Biomedical Optics

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Full-Text Articles in Biomedical Engineering and Bioengineering

Beam Hardening Correction Via Mass Attenuation Discretization, Renliang Gu, Aleksandar Dogandžić Jan 2013

Beam Hardening Correction Via Mass Attenuation Discretization, Renliang Gu, Aleksandar Dogandžić

Electrical and Computer Engineering Conference Papers, Posters and Presentations

We develop a beam-hardening correction method for polychromatic xray computed tomography (ct) reconstruction based on mass attenuation coefficient discretization. We assume that the inspected object consists of an unknown single material and that the incident x-ray spectrum is unknown. In this case, the standard photon-energy discretization of the Beer’s law measurement equation leads to an excessive number of unknown parameters and scaling ambiguity. To obtain a parsimonious measurement model parametrization, we first rewrite the measurement equation in terms of integral expressions of the mass attenuation rather than photon energy. The resulting integrals can be discretized easily thanks to the ...