. Author manuscript; available in PMC: 2010 Aug 11.

Published in final edited form as: Phys Med Biol. 2007 Dec 19;53(1):203–216. doi: 10.1088/0031-9155/53/1/014

Table 4.

The input features selected by model SOM_all and SOM_dose. V_x is the lung volume above x Gy. Higher values of the dose variables are indicative of greater risk of radiation pneumonitis. Arrows next to the non-dose variables indicate higher (↑) or lower (↓) risk.

SOM_all	SOM_dose
EUD a = 0.9	EUD a = 0.7
EUD a = 1.0	EUD a = 0.8
EUD a = 1.1	EUD a = 0.9
Chemotherapy prior to RT (yes↑ versus no↓)	EUDa = 1.0
Histology (squamous cell↑ versus other histology↓)	V₄₀
Tumor location (lower lobe↑ versus other location↓)	V₄₂
	V₄₄