Physics Bucharest 2017

Longitudinal - Spread Out Bragg Peak

1.2

• SOBP → Superposition of multiple mono-energetic pencil beams • Homogeneity and conformation of dose to target is achieved through mathematical optimization of weights of individual pencil beams

1

TARGET

0.8

0.6

OAR

0.4

Dose [relative units]

0.2

0

0

2

4

6

8

10

12

14

16

18

20

Depth [cm]