System and method for adjusting multi-leaf collimator

The present application provides systems and methods for adjusting a multi-leaf collimator (MLC). The MLC comprises at least two cross-layer blade pairs, each cross-layer blade pair comprises a first blade located in the first layer of blades and a second blade located in the second layer of blades, and the first blades and the second blades are oppositely arranged. For at least one group of cross-layer blade pairs, determining an effective cross-layer blade gap to be formed between the first blade and the second blade; at least one blade pair of the first and second blades may be moved to form an effective cross-layer blade gap; also, based on the effective cross-layer blade gap, a first in-layer blade gap may be formed between the first blade in the first layer and the first opposing blade. The size of the blade gap in the first layer may be not less than a first threshold. 本申请提供了用于调节多叶准直器(MLC)的系统和方法。MLC包括至少两组跨层叶片对，每组跨层叶片对包括位于第一层叶片中的第一叶片和位于第二层叶片的第二叶片，所述第一叶片和所述第二叶片相对设置。对于至少一组跨层叶片对，可以确定在第一叶片和第二叶片之间待形成的有效跨层叶片间