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Steps of IGRT
on the treatment machine using CBCT
1. Green-purple overview: entire FOV visible
2. Registration in 6 DoF
3. Evaluation of registration, did the algorithm work?
4. Evaluation of anatomy:
– GTV/CTV within PTV?
– no anatomical changes compromising dose
distribution?
– Rotations within threshold?
5. Evaluation of the correction
Typical Protocol