目的：研究多叶准直器在临床的应用价值。
Purpose to study the clinical applying value of multi-leaf collimator.
另外，文中介绍了双层多叶准直器等几种新型设计方案。
Several new designs of MLCs are also introduced in this article, such as dual MLCs.
这种设备可以替代现有的多叶光栏和其它类别的准直器，使适形放疗更加易于实现。
It is able not only to replace many existing collimators such as MLC, but also to make the conformal radiotherapy easier.
这种设备可以替代现有的多叶光栏和其它类别的准直器，使适形放疗更加易于实现。
It is able not only to replace many existing collimators such as MLC, but also to make the conformal radiotherapy easier.
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