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Dose distribution of carbon ion beams in a patient with hepatocellular carcinoma 8 cm in diameter in the right superior segment of the liver. Beams were delivered in combination with anterior and lateral ports (dose ratio 1:1) in the prone position. The yellow line represents the planning target volume, and the red, orange, pink, and green curves represent the 95%, 90%, 70%, and 50% isodose lines, respectively.
