367 / 1726
A. Bladder
0
10
20
30
40
50
180,0
120,0
60,0
0,0
-60,0
-120,0
Angle (degrees)
IDD (mm)
L1
L2
L3
V1
V2
V3
B. Rectum
0
10
20
30
40
50
180,0
120,0
60,0
0,0
-60,0
-120,0
Angle (degrees)
IDD (mm)
L1
L2
L3
V1
V2
V3
C.Sigmoid colon
0
10
20
30
40
50
180,0
120,0
60,0
0,0
-60,0
-120,0
Angle (degrees)
IDD (mm)
L1
L2
L3
V1
V2
V3
Uncertainty bladder:
3 mm
Uncertainty Rectum: up to
5 mm
Uncertainty sigmoid colon: up to several cm!
Petric P, et al. Eur J of cancer 2013;49(2):S726 (Abstract; ECCO/ESMO/ESTRO, Amsterdam 2013)
Accurate contouring
Pre-requisite for success of highly conformal RT but not that easy !