Multi-leaf collimators

摘要

A multi-leaf collimator for a radiotherapy apparatus comprises at least one array of laterally-spaced elongate leaves, each leaf being driven by an associated motor connected to the leaf via a drive means so as to extend or retract the leaf in its longitudinal direction, the drive means comprising a sub-frame on which at least a subset of the motors are mounted, the sub-frame being mounted at a location spaced from the leaf array in a direction transverse to the lateral and longitudinal directions, and including a plurality of threaded drives disposed longitudinally, each being driven by a motor and being operatively connected to a leaf thereby to drive that leaf.

主权项

1. A multi-leaf collimator for a radiotherapy apparatus, comprising at least one array of elongate leaves spaced in a lateral direction and a plurality of motors, each leaf being driven by one of the motors of the plurality of motors, each motor connected to one of the leaves via a drive means so as to extend or retract the leaf in a longitudinal direction, the multi-leaf collimator comprising a sub-frame on which at least a subset of the plurality of motors are mounted, the sub-frame being mounted at a location spaced from the leaf array in a direction transverse to the lateral and longitudinal directions, the drive means including a plurality of elongate threaded drives which are disposed longitudinally, each elongate threaded drive being driven by one of the motors of the subset of motors and being operatively connected to a leaf thereby to drive that leaf, wherein some of the subset of the plurality of motors mounted on the sub-frame are mounted at a first longitudinal end of the elongate threaded drives, and a remainder of the subset of the plurality of motors are mounted at a second longitudinal end of the elongate threaded drives.