根据调制解调的频谱转移特性，提出了有效位移噪声是高斯窄带噪声。
According to frequency spectrum transfer characteristic of modulation and demodulation, we think the position measurement noise is Gaussian narrowband noise.
调幅讯号之频谱为一半强度基频讯号之频谱分别正负位移一射频或载波之频率。
The spectrum of amplitude modulated signal are two half magnitude spectrums of base band signal positive and negative shifted by a carrier or R. F. frequency.
目的：评价SPIR(用于化学位移脂肪抑制的频谱预饱和反转复位技术)与造影增强联合应用在眼眶病变判断中的作用。
Purpose: To evaluate the role of SPIR (a chemical shift fat suppression technique) in the evaluation of orbital lesions, especially when used in conjunction with contrast enhancement.
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