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Dose per MU formalisms:

factor-based dose calculations

collimator setting

(equivalent square)

eqsq

c

eqsq d,

s

field size at depth

(equivalent square)

eqsq

eqsq d,

c

s

Calculation point at isocentre:

Nomenclature used in this presentation

(in analogy, but not identical, to that in AAPM Task group report 71)

ref

ref

r c

reference field size/collimator setting

ref

d

reference depth