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Aspects
▪
penetration depth
▪
dose delivered to normal
tissue
▪
penumbra broadening
Higher energy in low density regions
▪
higher energies means larger penumbra due to increase in lateral
electron transport (≥10MV)
▪
sufficiently accurate planning calculation algorithms are required
for decisions on optimal beam energy
4MV 6MV 8MV
10MV
≥18MV
15MV
Cranial
HN
Thorax
Pelvic
Choice of optimal beam energy