751 / 1542
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