Abstract
An analytical method for 3-dimensional calculation of the contaminant X-ray dose in water caused by clinical electron-beam irradiation
Highlights
Khan [1] describes the physical outline of high-energy electrons used in radiation therapy as follows: The most useful energy for electrons is 6 to 20 MeV
Based on Clarkson’s sector method, we developed an analytical method for calculation of the contaminant X-ray dose in water caused by clinical electron-beam irradiation
The analytical method was constructed by considering the following terms: (a) the vague beam-field margins formed by the dual-foil system; (b) the in-air dose distribution of the contaminant X-ray beam; (c) the X-ray spectrum change between the contaminant X-ray percentage depth dose (PDD) datasets and the published radiotherapy X-ray PDD datasets; and (d) the contaminant X-ray attenuation for the cerrobent insert, if any
Summary
Khan [1] describes the physical outline of high-energy electrons used in radiation therapy as follows: The most useful energy for electrons is 6 to 20 MeV At these energies, the electron beams can be used to treat superficial tumors (less than 5 cm deep) with a characteristically sharp dropoff in dose beyond the tumor. The principal applications are (a) the treatment of skin and lip cancers, (b) chest wall irradiation for breast cancer, (c) administering boost dose to nodes, and (d) the treatment of head and neck cancers. Many of these sites can be treated with superficial X-rays, brachytherapy, or tangential photon beams, the electron-beam irradiation offers distinct advantages.
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