1259 / 1601
6
How flexible is the neck ?
Count occurrence of ROI
within certain margin
ROI:
• PTV(larynx)
• OAR (C3-C5)
Margin 0..10 mm (1 mm)
How flexible is the neck ?
Results: PTV (larynx)
Count of Larynx found within margin after online registration
in 249 CBCT scans
0.0
10.0
20.0
30.0
40.0
50.0
60.0
70.0
80.0
90.0
100.0
110.0
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
1
Margin(cm)
Count (%)
Larynx - Multi Match
Larynx - Overall ROI
Larynx - Larynx
Org. Reg.
How flexible is the neck ?
Results: OAR/lymphnode
Count of C3-C5 found within margin after online
registration in 249 CBCT scans
0.0
10.0
20.0
30.0
40.0
50.0
60.0
70.0
80.0
90.0
100.0
110.0
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
Margin(cm)
Count (%)
C3-C5 - Multi Match
C3-C5 - OverallROI
C3-C5 - Larynx
Org. Reg.
Side things learned from imaging
Bad tongue depressor
Tumor borders moving outside the field
Old school patient positioning advise
Keep your eye open to unexpected
recurrences (Close the feedbackloop)
Tongue depressor
New Old
Two examples on the side
Positioning of the patient
Interaction of image guidance and treatment
planning
– How to ease the life of your treatment planner