619 / 1173
Lyman model
(
see BCR book, Ch 5.9
)
NTCP
(
D
,
V
)
=
1
2
π
⋅
exp(
−
1
2
⋅
x
2
)
dx
−∞
u
(
D
,
V
)
∫
u
(
D
,
V
)
=
D
−
TD
50
(
V
)
m
⋅
TD
50
(
V
)
TD
50
(
V
)
=
TD
50
(1)
V
n
TD
50
= uniform dose producing 50% incidence of specific effect
n
= denotes influence of volume effect in organ of interest
m
= inverse of dose response curve gradient
0 <
n
< 1
Larger
n
,
more volume effect