Methods Computerized ultrasonic doppler system was used to study the four-chamber view of 137 fetal hearts from 10 to 17 weeks of gestation.

方法应用彩色多谱勒超声检测137例孕10至17周的正常胎儿心脏四腔结构。

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Objective To design a digital multigated PW ultrasound Doppler system and validate the system in experimental study.

目的设计一套数字化脉冲波超声多普勒系统，以实现多深度血流频谱分析和显示。

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Methods The changes of portal hemodynamics were measured by using ultrasonic Doppler system in 18 patients with CHB before and after treatment with self LAK cell infusion.

方法应用超声多普勒系统测量18例经自体LAK细胞回输治疗的慢乙肝患者治疗前后门静脉血流动力学参数。

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The deployment of the Doppler radar system in the early 1990s by the National Oceanic and Atmospheric Administration extended tornado warning lead times from five minutes to their now-annual average of 12 to 14 minutes.

CNN: The making of a nightmare tornado

The program, known as "Biometrics-at-a-distance, " would essentially combine two pre-existing Pentagon projects: the Radar Scope, a device that can see through walls, and 2009's LifeReader, a system that uses Doppler radar to detect heartbeats.

ENGADGET: DARPA to develop biometric sensor capable of seeing through walls, pulling your heartstrings