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Hearing apparatus contouring and the dose distributions on hearing apparatus of intensity-modulated radiation therapy (IMRT) and SmartArc-based volumetric modulated arc therapy (VMAT-S). (a) Blue line, cochlea; green line, vestibule; yellow line, middle ear. (b) IMRT. (c) VMAT-S. The green, purple, red and light blue lines were isodose curves of 68, 60, 54 and 45 Gy. See online for colour images.
