Benson D M, Waldroup L D, Kurtz A B, Rose J L, Ritkin M D, Goldberg B B
J Ultrasound Med. 1983 Nov;2(11):489-94. doi: 10.7863/jum.1983.2.11.489.
The purpose of this research effort was to establish a physical basis for the development of an accurate noninvasive technique to differentiate between mature and immature fetal tissues, particularly the lung and placenta. The research utilized RF waveform analysis via a microcomputer-based digital processing system interfaced directly to a standard real-time clinical diagnostic ultrasound instrument. Differences between the frequency spectra of the RF waveforms for mature and immature fetal tissues could be demonstrated in accordance with proposed tissue models.
这项研究工作的目的是为开发一种准确的非侵入性技术奠定物理基础，该技术用于区分成熟和未成熟的胎儿组织，特别是肺和胎盘。该研究通过一个基于微型计算机的数字处理系统利用射频波形分析，该系统直接与标准的实时临床诊断超声仪器相连。根据所提出的组织模型，可以证明成熟和未成熟胎儿组织的射频波形频谱之间存在差异。
