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Inter application variation- spatial location
•
Flange as the ref point (polar co cordinates)
Flange as origin
r(bladder)
r(rectum)
r(bladder)
= distance b/w centre of
Flange and ICRU bladder point
r(rectum)
= distance b/w centre of
Flange and ICRU rectum point
Ɵ(bladder)
=270
°
- Sin
-1
ø
where,
Sin ø
=(a/r)
&
a=
perpendicular distance
b/w ICRU bladder point and
vertical axis
a
ø
r(bladder)
r(rectum)