可变孔径准直器在赛博刀治疗规程中能更容易地切换射野大小，关于它的完整性能描述刊登在了《医学与生物学物理》杂志上。
A full description of the variable aperture collimator, which makes it easier to switch field size during CyberKnife procedures, is published in Physics in Medicine & Biology.
影响离轴抛物镜准直特性的主要因素有离轴量，有效孔径和焦面出射点的位置。
The basic factors affecting collimating characteristic are off-axis magnitude, effective aperture and emission position on the focal plane of off-axis parabolic mirror.
Gernot Echner及其同事所描述的鸢尾花型可变孔径准直器可彻底解决这个问题。
This problem is eradicated with the Iris Variable Aperture Collimator described by Gernot Echner and colleagues .
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