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Delivery Technology
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159 MeV Protons
192Ir (400 keV)
Relative Depth Dose
Depth in Water (cm)
Energy  Dwell Position (3D)
ERT
BRT
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10 MV
18 MV
6 MV
4 MV
Depth Dose
Depth (cm)
”Spot”
”Spot”
Modern Radiation Therapy