Table 2.

Organ tolerance dose limits for Radiation Therapy Oncology Group 0236^a

Organ	Volume	Total Dose
Spinal Cord	Any point	18 Gy maximum
Esophagus	Any point	27 Gy maximum
Ipsilateral Brachial Plexus	Any point	24 Gy maximum
Heart	Any point	30 Gy maximum
Trachea and Ipsilateral Bronchus	Any point	30 Gy maximum
Whole Lung (Right & Left)	<10% of volume	20 Gyb

^aExceeding organ limits by more than 2.5% constituted a ‘minor’ protocol violation. Exceeding these organ limits by more than 5% constituted a ‘major’ protocol violation.

^bAlso known as V-20 or volume of total lung getting 20 Gy or more.