Boyce E S, Dawes G S, Gough J D, Poore E R
Br Med J. 1976 Jul 3;2(6026):17-8. doi: 10.1136/bmj.2.6026.17.
An audible Doppler ultrasound method for detecting human fetal breathing movements in utero has been developed. The frequencies synchronous with fetal breathing movements probably originate from the lung rather than the chest wall. This method is much cheaper and simpler than the ultrasound A-scan method and is suitable for screening large numbers of people.
已开发出一种用于检测子宫内人类胎儿呼吸运动的可听多普勒超声方法。与胎儿呼吸运动同步的频率可能源于肺部而非胸壁。该方法比超声A扫描法便宜得多且更简单,适用于对大量人群进行筛查。