A leaf unit assembly for a multi-leaf collimator comprises a leaf, a leaf actuator screw having a first end fixedly attached to the leaf, and a rotatable part threadably engaged with the leaf actuator screw.

A mount for an array of leaf drive units corresponding to a single leaf bank of a multi-leaf collimator comprises a plurality of separable mounting plates. Each mounting plate comprises an array of mounting holes, and each mounting hole is arranged to receive a respective one of the leaf drive units.

The disclosure provides systems and methods for adjusting a multi-leaf collimator (MLC). The MLC includes a plurality of cross-layer leaf pairs, each cross-layer leaf pair of the plurality of cross-layer leaf pairs includes a first leaf located in a first layer of leaves and a second leaf opposingly located in a second layer of leaves. For at least one cross-layer leaf pair, an effective cross-layer leaf gap to be formed between the first leaf and the second leaf may be determined; at least one of the first leaf or the second leaf may be caused to move to form the effective cross-layer leaf gap; and an in-layer leaf gap may be caused, based on the effective cross-layer leaf gap, to be formed between the first leaf and an opposing first leaf in the first layer. A size of the in-layer leaf gap may be no less than a threshold.

The present disclosure provides a driving mechanism configured to drive a target object to perform a linear motion, wherein the target object includes at least one of a plurality of leaves of a multi-leaf collimator. The driving mechanism may include an output component including an output member. The driving mechanism may also include a transmission component configured to operably connect the output component and the target object. The transmission component may include an output end and an input end. The input end may be operably connected with the output member. The output end may be operably connected with the target object. A linear velocity of the output end may be larger than a linear velocity of the input end.

One or more example embodiments of the present invention relates to a fin for collimating therapeutic radiation. The fin comprises a collimation area made of a first material and a holding area made of a second material. Herein, the collimation area and the holding area are pressed together. Herein, the first material is formed to collimate therapeutic radiation. Herein, the holding area can be coupled to an adjustment device for adjusting the fin.

The invention provides a charged particle irradiation apparatus including: a collimator apparatus provided in an irradiation nozzle that emits a charged particle beam to an irradiation target; and a collimator control unit that controls the collimator apparatus. The collimator apparatus includes a collimator mechanism having one or more arm-shape collimators extending from a base part and a drive mechanism that moves the collimator mechanism on a plane perpendicular to a traveling direction of a charged particle beam. The arm-shape collimator includes one or more movable leaves that rotate independently of each other on the perpendicular plane. By moving the collimator mechanism and/or rotating the movable leaves so that the arm-shape collimators are arranged along a shape of an edge of an irradiation target on the perpendicular plane, the collimator control unit causes the arm-shape collimators to block a charged particle beam that would otherwise irradiate outside of the edge of the irradiation target.

A leaf for a multi-leaf collimator comprises a leaf portion for delineating a beam of radiation, the leaf portion having first attenuation factor. The leaf also comprises a tail portion having a second attenuation factor, the first attenuation factor being greater than the second attenuation factor.

A leaf assembly for a multi-leaf collimator comprises a leaf and a leaf nut removably mounted within the profile of the leaf, the leaf nut comprising a threaded hole for receiving a leaf actuator screw oriented along a first axis in the plane of the leaf. The leaf nut is mounted within the leaf such that relative movement between the leaf nut and the leaf is prevented both linearly along the first axis and rotationally about the first axis.

A linear accelerator head for use in a medical radiation therapy system can include a housing, an electron generator configured to emit electrons along a beam path, and a microwave generation assembly. The linear accelerator head may include a waveguide that is configured to contain a standing or travelling microwave. The waveguide can include a plurality of cells that are disposed adjacent one another, wherein each of the plurality of cells may define an aperture configured to receive electrons therethrough. The linear accelerator head can further include a converter and a primary collimator.

An X-ray diagnosis apparatus includes an X-ray limiter having four diaphragm blades and a console on which four physical operating units that correspond to the four diaphragm blades are placed at four positions. When viewed from the side of the operator of the console, the four operating units are placed on the far side, the near side, the left side, and the right side. The far-side operating unit, the near-side operating unit, the left-side operating unit, and the right-side operating unit correspond to the upper diaphragm blade, the lower diaphragm blade, the left-side diaphragm blade, and the right-side diaphragm blade, respectively, with reference to an X-ray image displayed in a display.