ESTRO course Dose Modelling and Verification 2017

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c

ref

Isocentric

• c

ref

= 10 x 10 cm²

Field size at isocenter

• d

ref

= 10 cm

• SSD = SAD - d

ref

Tissue phantom ratio

TPR(c,d)

Dose per MU formalisms:

factor-based dose calculations

Reference normalisation conditions









MU cGy

M

d cD

SAD

; ,

ref

ref









MU

cGy

M

d

c

D

SSD

; ,

ref

ref

Fixed SSD

c

ref

= 10 x 10 cm²

Field size at surface

d

ref

= 10 cm

SSD = SAD

Relative depth dose

RDD(s,d)

SAD

d

ref

d

ref

SSD=SAD

c

ref