This problem is eradicated with the Iris Variable Aperture Collimator described by Gernot Echner and colleagues .
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 .
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。
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