A method for in-vivo range control for prostate treatment by anterior-posterior fields

E. H. Bentefour, H. Lu & D. Prieels
Background: Current proton therapy treatment for prostate cancer uses only two parallel opposed lateral fields. At these beam angles rectum sparing relies solely on the lateral penumbra of the beam, which is degraded significantly by the lengthy beam path (~25 cm) to around 10 mm (20-80%),[for full text, please go to the a.m. URL]