Table 3.

Dosimetric comparison by treatment technique

Median (range)
	PTV (cc)	Mean lung dose (Gy)	Lung V20 (%)	Mean cardiac dose (Gy)	Mean esophageal dose (Gy)	Spinal cord maximum (Gy)
3D-ENI	406 (64–628)	16.6 (9.8–22.9)	29 (15–48)	16.2 (3.8–39.9)	* NA	47.2 (19.2–58.2)
3D-IFRT	433 (137–1405)	15.1 (8.1–22.7)	26 (13–47)	13.4 (0.7–36.3)	27.7 (3.4–53.5)	43.9 (15.0–48.6)
IMRT	515 (170–1182)	16.5 (5.6–20.7)	30 (13–38)	8.6 (0.16–32.3)	26.1 (6.1–51.3)	43.2 (13.3–50.7)

^*Insufficient patients treated with 3D-ENI had available esophageal dose metrics for analysis

Abbreviations: ENI = elective nodal irradiation; IFRT = involved field radiotherapy; IMRT = intensity-modulated radiation therapy; PTV: Planning target volume; V20: percent receiving 20 Gy