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. Author manuscript; available in PMC: 2012 Oct 1.
Published in final edited form as: Semin Radiat Oncol. 2011 Oct;21(4):278–286. doi: 10.1016/j.semradonc.2011.05.007

Figure 2.

Figure 2

Comparison between intensity modulated radiation therapy (photons) and proton radiotherapy (protons) for an unresectable hepatocellular carcinoma in a patient with multiple medical co-morbidities. A. Representative computed tomography (CT) axial, coronal and sagittal slices. Isodose lines are for a delivered proton dose of 66Gy in 20 fractions. B. Dose volume histogram comparison of the photon and proton plans for this patient. Note relative sparing of more liver in the low-dose region (below 30Gy). Mean liver dose was 30Gy for photons and 28Gy for protons.