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Table 1 Central Critical Structure Radiation Dose Limits

From: Radical cyberknife radiosurgery with tumor tracking: an effective treatment for inoperable small peripheral stage I non-small cell lung cancer

Adjacent Structure Maximum Dose Limit (total for 3 fractions)
Spinal cord 18 Gy
Left ventricle 18 Gy
Esophagus 24 Gy
Main bronchus 30 Gy
Trachea 30 Gy
Aorta 40 Gy