MULTI-LEAF COLLIMATOR FOR RADIOTHERAPY APPARATUS AND RADIOTHERAPY APPARATUS USING THE SAME

摘要

A multi-leaf collimator comprises a plurality of pairs of leaves, leaves of each pair being disposed oppositely from each other. Each pair of leaves comprises a first leaf and a second leaf which are configured to move oppositely relative to each other. In a first plane perpendicular to an isocenter plane of the radiotherapy apparatus and parallel to a direction of leaf movement, the first leaf and the second leaf are capable of moving to a closed position, where end surfaces of the first leaf and the second leaf are embedded with each other at the closed position.