، صفحه 0-0 (1)

عنوان دوره: اولین دوره بین المللی و بیست و هشتمین دوره ملی (1400)

Providing ideal properties to deliver precise and homogeneous dose distribution with preservation of normal tissue due to the distal fall-off of the dose beyond the Bragg peak has made proton therapy an appropriate method to treat tumors. Among the approaches commonly used, passive scattering is of concern because of the potential for generating secondary particles which can damage the non-target tissue. The present simulation-based study investigates the effect of using the passive method compared with the beam scanning for different primary proton energies. The results show that the generation of secondary neutrons strongly depends on the material used in the beam design. Also, it was found that the passive method leads to the physical neutron dose of about 13.4 times higher than that of the beam scanning method for typical primary energy of 100 MeV.

Proton therapy؛ Passive method؛ Secondary neutrons؛ Monte Carlo Simulations