Multi-leaf collimator, particle beam therapy system, and treatment planning apparatus

摘要

There are provided a leaf row in which a plurality of leaf plates are arranged in the thickness direction of the row in such a way that the respective one end faces of the leaf plates are trued up and a leaf plate drive mechanism that drives each of the plurality of leaf plates in such a way that the one end face approaches or departs from a beam axis. In each of the leaf plates, a facing side facing a leaf plate that is adjacent to that leaf plate in the thickness direction is formed of a plane including a first axis on the beam axis; the leaf plate drive mechanism drives the leaf plate along a circumferential orbit around the second axis, on the beam axis, that is perpendicular to the beam axis and the first axis.

主权项

1. A particle beam therapy system comprising:
an irradiation nozzle that scans and irradiates a particle beam supplied from an accelerator, by use of two electromagnets whose scanning directions are different from each other, said two electromagnets including an upstream electromagnet and a downstream electromagnet; and a multileaf collimator that is disposed on a beam orbit of a particle beam irradiated from the irradiation nozzle and that limits or forms an irradiation field of the charged particle beam in such a way that the irradiation field conforms to the shape of an irradiation subject, the multileaf collimator comprising:
a leaf row in which a plurality of leaf plates are arranged in a thickness direction thereof in such a way that respective inner end faces of the leaf plates are trued up; anda leaf plate drive mechanism configured to (i) drive each of the plurality of leaf plates in such a way that an inner end face approaches or departs from a beam axis of the charged particle beam and (ii) drive the plurality of leaf plates along a circumferential orbit around a scanning axis of the downstream electromagnet and at a preset distance from the scanning axis of the downstream electromagnet, wherein the particle beam is irradiated through a scanning method.