...R提供10个固定及可调制的前置选择器滤波器，保证有40dB以上的中间频率（intermediate frequency），影像频率（image frequency）及饱和效应等消除能力。唯有使用前置选择器，才能达到重复（Repeatable）量测能力。
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Aberle说，“然而，NLST取得的数据可以用于建立数学模型，来确定影像学检查所需的最佳时长和频率。
However, the NLST data can be used to develop mathematical models to determine how long screening should be performed and how often.
方法对临床怀疑肋骨骨折512例患者的肋骨cr影像应用谐调处理与空间频率处理的方法进行技术处理。
Methods the fractures of the ribs of 512 patients were suspected in clinic, and those CR images were processed with gradation and spatial frequency technology.
调制传输函数可对线性影像系统的频率传输特性进行描述。
Method Modulation transfer function (MTF) was used to analyze the spatial frequency transfer characteristics of ct and MRI.
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