Control of the distribution of the electron beam dose in radiation therapy

摘要

A method for an active control of the dose distribution produced by an electron beam in a substance is proposed. This method is based on the effect of a magnetic field on charged particles. The results of the calculations of the dose distribution for the irradiation of water as a tissue equivalent by a beam of electrons with energies of 20-30 MeV under the exposure of a magnetic field below 2.5 T are presented. Applying a field results in a dose distribution maximum at a depth of 3-6 cm. Varying the magnetic field configuration and electron energy can modify the dose distribution profile and the maximum position. This method is promising for the use in radiation therapy.