. Author manuscript; available in PMC: 2016 Aug 3.

Published in final edited form as: Int J Radiat Oncol Biol Phys. 2015 Mar 5;92(2):284–291. doi: 10.1016/j.ijrobp.2015.01.005

Table 4.

Organ at risk median dosimetry for various techniques targeting internal mammary lymph nodes

Parameter	Electrons (30)	Photon/ electron patch (31)	5-Field mixed photon/ electron (32)	IMRT after immediate reconstruction^* (33)	IMRT photons (34)	9-Field IMRT (25)	Tangential beamlet IMRT (25)	Protons (previous series) (19, 26)	Protons (present series)
Heart (mean dose)	NR	7.5 Gy	NR	3.50 Gy	8.69 Gy	7.18 Gy	2.60 Gy	0.44 Gy (RBE)	1.00 Gy (RBE)
Heart V20 (%)	NR	NR	46.00	NR	13.00	0.31	0.40	1.60	1.16
Heart V5 (%)	NR	NR	65.00^†	NR	56.00	80.18	10.15	4.10	5.00
Ipsilateral lung V20 (%)	38.03	NR	28.00	25.30	28.00	34.46	29.49	16.20	16.50
Ipsilateral lung V5 (%)	NR	NR	65.00^†	NR	65.00	93.45	54.00	25.20	34.35
Total lung V20 (%)	20.39	14.4	NR	NR	NR	NR	NR	12.70	7.31

Abbreviations: IMRT = intensity modulated radiation therapy; NR = not reported.

Forward planned simplified IMRT using opposed lateral beams.

^†

Extrapolated from figure in publication.