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Relationships between quantities
TPR from RDD measured isocentrically
(
)
(
)
(
)
zz cm A AD D
z A
PDD
p
SAD
c
SAD B
B
p
;
90,
,
;
+
= =
cm
SAD
100
=
z
cm SSD
90
=
cm z
ref
10
=
A
B
cm SSD
90
≠
cm z
ref
10
=
SAD SDD
≠
C
cm cm A AD D
p
SAD
c
SAD A
A
SAD
10;
100 ,
,
10,90
(
)
(
)
(
)
cm z cm A AD
zz cm A AD
D
D
z A TPR
p
SAD
c
SAD C
p
SAD
c
SAD B
C
B
p
SAD
10;
90,
,
;
90,
,
;
+
+
= =
Need to relate D
C
to D
A