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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

n

different

tissues each if thickness

d

i

and density

ρ

i

n

i

d

d

1

i i

eff

Note:

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

how exactly this is derived is not always apparent

d