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Can we derive an internal target volume from 3D PET?
• 12 NSCLC scheduled for SBRT; 4D PET/CTs, 4 observers:
• 1. ITV in 4D CT „gold standard“
• 2. „GTVs“ in 3D PET
• 3. ITVs from 4D PET
- manual
- Homburg algorithm
- Rover algorithm
- 40% SUVmax
- 15% SUVmax
34
0
5
10
15
20
25
30
manual mean
HOM
Rover
40%
15%
ITV-4D CT
3D-GTV-PET
ITV- 4D PET
ml