| 摘要 |
PROBLEM TO BE SOLVED: To provide a multileaf collimator and a radiotherapy apparatus in which an irradiation range of radiation can be set with high accuracy. SOLUTION: The multileaf collimator 1 sets an irradiation range of radiation matching a shape of the lesion part inside the body of a patient. The multileaf collimator 1 includes a pair of leaf plate groups 10 and a pair of drive units 12. The leaf plate groups 10 have a plurality of leaf plates 14A, 14B arranged along a direction orthogonally crossing the irradiation axis A of radiation. The drive units 12 are connected to the leaf plates 14A, 14B one to one and have drive means rows placed so that a plurality of drive mechanisms 24 for driving the leaf plates 14A, 14B in a direction where the leaf plate groups are arranged are arranged along the irradiation axis A. The drive units 12 are positioned to a side of a radiation source for irradiating radiation away from the leaf plates 14A, 14B. COPYRIGHT: (C)2009,JPO&INPIT
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