681 / 1245
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,z)
SAD
d
ref
d
ref
SSD=SAD
c
ref