实现这种效果具代表性地是采用固定、圆形的准直器，它能够产生边缘锐利、高适形的治疗射束。
This is typically achieved using fixed, circular collimators that produce sharp-edged, highly conformal treatment beams.
用来屏蔽带电粒子束的设备。射束屏蔽单元(1)包括固定到支撑板(15)的第一和第二屏蔽板(2,3)。
Apparatus for blanking a charged particle beam a beam blanking unit (1) comprises first and second blanking plates (2, 3) mounted to a support plate (15).
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