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Updated: Oct 17, 2026

Dynamic Lung Tumor Tracking for Stereotactic Ablative Body Radiation Therapy
Published on: June 7, 2015
Effect of air cavities on the dose delivered to the lung during high-dose brachytherapy
R M Ambrosi1, J I Watterson, T Nam
1Schonland Research Centre for Nuclear Sciences, University of the Witwatersrand, Johannesburg, South Africa.
Abstract:
In the treatment of lung cancer using the radiotherapy technique of intracavitary brachytherapy with an 192Ir source, the lung is normally assumed to be entirely composed of a homogeneous mass of soft tissue. The aim of this study is to investigate whether there is the possibility that the air cavities in the lung influence the dose delivered to the lung at a prescribed distance from the source. The Monte Carlo code MCNP-4A was used to model the dose delivered by both 192Ir and 198Au as a function of treatment medium, density and composition, photon energy, and distance from the source. The suitability of MCNP-4A for this study was tested by producing depth-dose profiles for photons in water and comparing these to calculated profiles produced using well-documented methods.
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