Multi-leaf collimator and radiation therapy head

A method for driving a multi-leaf collimator, comprising:

• determining, according to a treatment plan, a target radiation field to be formed;
• inquiring, from a preset corresponding relationship between radiation fields and driving modes, a target driving mode corresponding to the target radiation field;
• and
• controlling, according to the target driving mode, leaves to move,
• wherein the multi-leaf collimator comprises a driving component, a controller and n leaf-group layers, where n is an integer greater than or equal to 2, wherein each leaf-group layer comprises one group of leaves or two opposing groups of leaves, each group of leaves comprises a plurality of leaves, each of the leaves comprises a front end surface and a rear end surface which are opposite to each other, and each of the leaves is movable so that the front end surfaces of the leaves in the multiple leaf-group layers form a variable-shaped region that allows beams to pass through;
• the rear end surface of the leaf is connected to the driving component, and the controller is configured to control the driving component to drive the leaf to move;
• and among the n leaf-group layers, at least one leaf-group layer comprises two opposing groups of leaves, and at least one leaf-group layer comprises only one group of leaves.

An apparatus for driving a multi-leaf collimator, comprising:

• a processor;
• and
• a memory configured to store an instruction executable by the processor, wherein when the instruction is executed by the processor, the instruction causes the processor to:
• determine, according to a treatment plan, a target radiation field to be formed;
• inquire, from a preset corresponding relationship between radiation fields and driving modes, a target driving mode corresponding to the target radiation field;
• and
• control, according to the target driving mode, leaves to move,
• wherein the multi-leaf collimator comprises a driving component, a controller and n leaf-group layers, where n is an integer greater than or equal to 2, wherein each leaf-group layer comprises one group of leaves or two opposing groups of leaves, each group of leaves comprises a plurality of leaves, each of the leaves comprises a front end surface and a rear end surface which are opposite to each other, and each of the leaves is movable so that the front end surfaces of the leaves in the multiple leaf-group layers form a variable-shaped region that allows beams to pass through;
• the rear end surface of the leaf is connected to the driving component, and the controller is configured to control the driving component to drive the leaf to move;
• and among the n leaf-group layers, at least one leaf-group layer comprises two opposing groups of leaves, and at least one leaf-group layer comprises only one group of leaves.