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• Acquire 4D CT scan
• Select mid-ventilation phase:
Element of 4D scan closest to mid-position
• Optimize treatment plan on mid-ventilation
• Acquire 4D CBCT
• Bone match
Tumor match
• Apply correction
• Validate correction with 2
nd
scan
• Contact physician if
– Shift > 1 cm
– Anatomical changes
Planning
Treatment
SBRT Lung: Protocol at NKI