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

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.

Citation Download Citation

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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