Dose Course 2018_Flipping book

Dose per MU formalisms: factor-based dose calculations Reference normalisation conditions

Fixed SSD

Isocentric

c

= 10 x 10 cm² Field size at surface

• c

ref = 10 x 10 cm² Field size at isocenter

ref

d = 10 cm SSD = SAD ref

• d = 10 cm • SSD = SAD - d ref ref

SAD

Relative depth dose RDD(s,z)

Tissue phantom ratio TPR(c,d)

SSD=SAD

d

ref

c

ref

c

ref

d

ref

(

) 

D

M d c ref

SSD ; ,

 MU

(

) 

ref

cGy

M d cD SAD ; , ref

 MU cGy

ref