Physics Bucharest 2017

Percent Depth Dose

Softer spectrum Steeper dose curve

• • •

D max closer to the surface (balance between no beam hardening and less head scatter) • Lower beam quality (presence of low energy photons)

Varian

Elekta

Vassiliev ON et al, PMB 2006; 51

Cashmore J. et al, PMB 2008; 53