Tracking of fetal breathing movements by pulsed Doppler ultrasound
Tracking of fetal breathing movements by pulsed Doppler ultrasound
复制标题
通过脉冲多普勒超声跟踪胎儿呼吸运动
DOI：
10.1046/j.1469-0705.1991.01030202.x
复制
发表时间：
1991
影响因子：
7.1
通讯作者：
M. Mizuno
中科院分区：
文献类型：
--
作者：
N. Shinozuka;Y. Yamakoshi;T. Okai;M. Mizuno
胎儿呼吸运动是监测胎儿状况和功能发育的有用手段。胎儿呼吸运动的精确定量评估需要开发连续自动化技术。使用胎心监护仪对胎儿呼吸运动引起的多普勒信号进行了初步研究，其中正常的高通“重击”滤波器已被移除。然后对脉冲多普勒系统进行修改，以产生五个同时输出，代表间隔 1.5 厘米的深度的运动。这些输出代表组织内部不同深度的位移。信号处理在带有模数转换器的 32 位计算机上执行。采用过零法在线处理和反正切法离线高精度位移估计技术。使用计算机信号处理，可以检测代表胎儿呼吸运动的几百微米的运动，同时拒绝由于母亲呼吸等引起的粗大运动。尽管在临床应用之前还需要进一步研究，但似乎通过该技术应该可以对胎儿呼吸运动进行定量评估。版权所有 © 1991 国际妇产科超声学会
Fetal breathing movements form a useful means of monitoring fetal conditions and functional development. Precise quantitative evaluation of fetal breathing movements requires the development of a continuous automated technique. A preliminary study of Doppler signals due to fetal breathing movements was carried out using a cardiotocograph in which the normal high‐pass ‘thump’ filter had been removed. A pulsed Doppler system was then modified to produce five simultaneous outputs representing movement at depths separated by 1.5‐cm intervals. These outputs represent the displacement inside tissue at the various depths. Signal processing was executed on a 32‐bit computer with an analog‐to‐digital converter. On‐line processing using a zero‐crossing method and an off‐line high‐accuracy displacement estimation technique using an arc‐tangent method were applied. Using computerized signal processing, it was possible to detect movements of a few hundred microns representing fetal breathing movements while rejecting gross movements due to maternal breathing, etc. Although further studies are required before clinical application, it appears that quantitative assessments of fetal breathing movements should be possible with this technique. Copyright © 1991 International Society of Ultrasound in Obstetrics and Gynecology