Fig. 2From: Treatment outcomes of passive scattering proton beam therapy for stage I non-small cell lung cancerBoxplots showing the received maximum point dose* (Dmax) of 4 critical normal organs by each fraction number and red horizontal lines indicating the dose constraint we used in the study a Absolute Dmax in 4 fractions (n = 33), b Absolute Dmax in 10 fractions (n = 9). CGE, cobalt Gray equivalents; PBT/large bronchus, proximal bronchial tree. *Maximum point dose was defined as the highest dose to 0.035 cc of the tissue within the critical structureBack to article page