Dose Course Book

Dose per MU formalisms:

factor-based dose calculations

Inhomogeneities

Effective depth

to a calculation point is the thickness of water equivalent tissue that

would attenuate the radiation by the same amount as the actual tissue along a fan-line

between the calculation point and the surface

If the radiation passes through

different

tissues each if thickness

and density

∑

i i

eff

Note:

TPSs usually report an effective depth for a calculation point, but

how exactly this is derived is not always apparent