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Isodose distribution with the anterior and right lateral proton beams in a hepatocellular carcinoma patient with severe cirrhosis. Each isodose line corresponds to 90%, 50%, 30%, and 10% dose levels from the inside out, respectively. The critical organs such as the spinal cord and the digestive tracts are located entirely outside the irradiated volume due to sharp distal fall-off of the Bragg peak of proton beams.
