field weighting, treatment machine properties, changes in treatment plans, and beam modifiers (tx dose and prescription)

photon therapy energies range from about ? to ? Mv

4-35

electron therapy energies range from about ?-? MeV

4-22

isocenter=

100cm

what is the max field size?

40×40cm at 100 SSD

(T/F) if changes in the treatment plans change including the field size or shape, then the new field must be imaged for confirmation

T

beam modifiers are placed btw what 2 things?

patient

beam

do beam modifiers attenuate the beam?

yes

if beam modifiers attenuate the beam, then what must be increased?

monitor units to compensate for the partial loss of useful beam

(T/F) bolus and bolus thickness must be on the prescription

T

(T/F) wedges, MLC shape, blocks, etc. do not need to be on the prescription but it should be on the treatment plan

T