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Dose distributions for CK and HA with target volumes of (A, B) 0.5 and (C, D) 0.7 cm3 in cases of multiple metastases. The maximum distance between each tumor were (A, B) 4.7 and (C, D) 9.2 cm. Each colored line represents an isodose line, where cyan and white represent low-isodose lines at 3.0 and 6.0 Gy, respectively. CK, CyberKnife; HA, HyperArc; PTV, planning target volume.
