720 / 1542
100
60
Problem in external beam RT:
single beam
→
low dose in
deep seated tumors
100
Reason 1) many beams to spread out entrance dose
|
|
720 / 1542
100
60
Problem in external beam RT:
single beam
→
low dose in
deep seated tumors
100
Reason 1) many beams to spread out entrance dose