1484-1485 / 1726
Sigmoid:
might change
its location
Bladder:
change of filling
(use of bladder filling
protocol)
Inter-/intra-fraction variations
2cc
1cc
0.1cc
Bladder
Rectum
ICRU 38 Ref. Points
GTV
Sigmoid
Target
fixed to applicator
Rectum:
change of position or
filling with gas