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 multileaf collimator that is disposed on a beam orbit of an accelerated charged particle beam and that limits or forms an irradiation field of the charged particle beam in such a way that the irradiation field conforms to an irradiation subject, the multileaf collimator comprising:
a leaf row in which a plurality of leaf plates are arranged in the thickness direction thereof 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 of the charged particle beam, wherein each of the plurality of leaf plates has at least one curved surface having two different curvature radiuses in respective directions, wherein a first axis that is the center axis of one curvature radius out of the two curvature radiuses passes through a first reference point on the beam axis, and wherein a second axis that is the center axis of the other curvature radius passes through a second reference point that is on the beam axis and apart from the first reference point.