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Delivery Technology

0 2 4 6 8 10 12 14 16 18 20 22 24 26 28

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

1.4

1.5

159 MeV Protons

192

Ir (400 keV)

Relative Depth Dose

Depth in Water (cm)

Energy

Dwell Position (3D)

ERT

BRT

0 5 10 15 20 25 30 35

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

10 MV

18 MV

6 MV

4 MV

Depth Dose

Depth (cm)

”Spot”

”Spot”

Modern Radiation Therapy