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Proceedings Article

Secondary radiations in CBCT: a simulation study

[+] Author Affiliations
Patricia Wils, Jean M. Létang

CREATIS, CNRS, Univ. Lyon 1 (France)

Jean-Pierre Bruandet

Digisens SA (France)

Proc. SPIE 8000, Tenth International Conference on Quality Control by Artificial Vision, 80000D (July 12, 2011); doi:10.1117/12.890510
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From Conference Volume 8000

  • Tenth International Conference on Quality Control by Artificial Vision
  • Jean-Charles Pinoli; Johan Debayle; Yann Gavet; Frédéric Gruy; Claude Lambert
  • Saint-Etienne, France | June 28, 2011

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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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 (July 12, 2011); doi:10.1117/12.890510; http://dx.doi.org/10.1117/12.890510


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