An Ultrasound System for Combined Cardiac Imaging and Doppler Blood Flow Measurement in Man
An Ultrasound System for Combined Cardiac Imaging and Doppler Blood Flow Measurement in Man
复制标题
用于联合心脏成像和多普勒血流测量的人体超声系统
作者：
J. Griffith;W. Henry
总结已经开发了一种超声仪器，其结合了实时横截面成像系统和基于频谱分析仪的多普勒测速仪。这种组合允许将多普勒采样体积叠加在心脏的横截面图像上，从而可以准确定位采样体积。用于横截面成像的相同的2.2 MHz换能器被机械地停止并快速切换以发送和接收多普勒超声信号。在20名年轻和成年正常受试者中的初步经验表明，可以将多普勒样本量放置在近端主肺动脉中声束和血流平行的点处。测量传感器到样本体积的距离和正常受试者主肺动脉中的峰值血流速度表明这些量在系统的测量能力范围内。该设备的最终目标是无创地测量人体的血流量。
SUMMARY An ultrasound instrument has been developed that combines a real-time cross-sectional imaging system and a spectrum analyzer-based Doppler velocimeter. This combination allows the Doppler sample volume to be superimposed on the cross-sectional image of the heart so that the sample volume can be located accurately. The same 2.2 MHz transducer utilized for cross-sectional imaging is stopped mechanically and quickly switched to transmit and receive the Doppler ultrasound signal. Preliminary experience in 20 young and adult normal subjects indicates that it is possible to place the Doppler sample volume in the proximal main pulmonary artery at a point where the sound beam and blood flow stream are parallel. Measurement of the distance from transducer to the sample volume and the peak blood flow velocities in the main pulmonary artery of normal subjects indicates that these quantities are within the measurement capabilities of the system. The ultimate goal of this device is to make measurements of volume blood flow in man noninvasively.