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. Author manuscript; available in PMC: 2019 Sep 28.
Published in final edited form as: Phys Med Biol. 2018 Sep 28;63(19):195007. doi: 10.1088/1361-6560/aadf7d

Figure 2.

Figure 2.

Dose differences ΔD=D(0.26) − D(1) (left) and D(0.1) − D(1) (right) for a 3-cm tumor irradiated with 6 MV FF beams. The numbers in parentheses are densities of the material surrounding the tumor: 0.26 g/cm3 is the average lung density, 0.1 g/cm3 represents a low-density emphysematous lung, 1 g/cm3 is water. Doses for each density were calculated with Monte Carlo and normalized to 50 Gy at the isocenter. Substantial dose deficit at the tumor periphery is seen in both cases. It is particularly severe for the low-density lung.