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超声脉冲多普勒技术是近年发展起来的一种无创伤检测心脏分流性疾病的新技术。它已部分取代了心导管检查,国内这方面工作进展很快。先心病是儿童的常见病,下面概述用超声脉冲多普勒新技术检测左向右分流先心病的临床应用。超声波在人体中传播,遇到血流时,由于红细胞的运动及其具有散射作用,可产生Doppler效应。如血流迎向探头时,反射频率高于发射频率,如血流背离探头时,反射频率则低于发射频率。反射频率与发射频
Ultrasound pulsed Doppler technology is a new technique developed in recent years, a non-invasive detection of cardiac shunt disease. It has partially replaced cardiac catheterization and the work in this area in China has been progressing rapidly. Congenital heart disease is a common childhood disease, the following outlines the clinical application of pulsed Doppler ultrasound technology for detecting left-to-right shunt congenital heart disease. Ultrasound spreads in the human body, in the face of blood flow, due to red blood cell movement and its scattering effect, can produce Doppler effect. When the blood flows toward the probe, the reflection frequency is higher than the emission frequency. For example, when the blood flow deviates from the probe, the reflection frequency is lower than the transmission frequency. Reflected frequency and transmit frequency