Secondary radiations in CBCT: a simulation study

Patricia Wils; Jean M. Létang; Jean-Pierre Bruandet

doi:10.1117/12.890510

12 July 2011 Secondary radiations in CBCT: a simulation study

Patricia Wils, Jean M. Létang, Jean-Pierre Bruandet

Author Affiliations +

Proceedings Volume 8000, Tenth International Conference on Quality Control by Artificial Vision; 80000D (2011) https://doi.org/10.1117/12.890510
Event: 10th International Conference on Quality Control by Artificial Vision, 2011, Saint-Etienne, France

Abstract

Accurate quantitative reconstruction in kV cone-beam computed tomography (CBCT) is challenged by the presence of secondary radiations (scattering, fluorescence and bremsstrahlung photons) coming from the object and from the flat-panel detector itself. This paper presents a simulation study of the CBCT imaging chain as a first step towards the development of a comprehensive correction algorithm. A layer model of the detector is built in a Monte Carlo environment in order to help localizing and analyzing the secondary radiations. The contribution of these events to the final image is estimated with a forced-detection scheme to speed-up the Monte Carlo simulation without loss of accuracy. We more specifically assess to what extent a 2D description of the flat-panel detector would be sufficient for the forward model (i.e. the image formation process) of an iterative correction algorithm, both in terms of energy and incidence angle of incoming photons. A convolution model to account for detector secondary radiations is presented and validated. Results show that both object and detector secondary radiations have to be considered in CBCT.

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Patricia Wils, Jean M. Létang, and Jean-Pierre Bruandet "Secondary radiations in CBCT: a simulation study", Proc. SPIE 8000, Tenth International Conference on Quality Control by Artificial Vision, 80000D (12 July 2011); https://doi.org/10.1117/12.890510

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