Transcutaneous measurement and spectrum analysis of heart wall vibrations
Transcutaneous measurement and spectrum analysis of heart wall vibrations
复制标题
心壁振动的经皮测量和频谱分析
DOI：
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
N. Chubachi
中科院分区：
文献类型：
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作者：
Hiroshi Kanai;Michie Sato;Y. Koiwa;N. Chubachi
对于基于心肌的声学和弹性特性的心脏病的非侵入性诊断，需要在高达1 kHz的宽频率范围内连续地测量来自心脏壁的各个部分的小振动信号，包括幅度小于100 /spl mu/m的分量，持续超过几次心跳的周期。然而，迄今为止，这种测量还没有通过任何超声诊断方法或系统来实现。通过引入约束最小二乘法，提出了一种基于解调信号的相位和幅度来精确跟踪心壁运动的新方法，以确定目标的瞬时位置，从而精确估计运动目标的振动速度。通过这种方法，在由10 mm的大振幅的心跳引起的运动中，可以在高达几百赫兹的频率范围内连续地以大约10次心跳的周期成功地以足够的再现性检测心壁的小振动，该小振动具有小于100 /spl μ/m的小振幅。由此产生的小振动不仅在时域中进行了分析，而且在频域中。本文报道的初步实验证实，新方法提供了潜在的心脏疾病的声学诊断的研究。
For the noninvasive diagnosis of heart disease based on the acoustic and elastic characteristics of the heart muscle, it is necessary to transcutaneously measure small vibration signals, including components with an amplitude of less than 100 /spl mu/m, from various parts of the heart wall continuously for periods of more than several heartbeats in a wide frequency range up to 1 kHz. Such measurement, however, has not been realized by any ultrasonic diagnostic methods or systems to date. By introducing the constraint least-square approach, this paper proposes a new method for accurately tracking the movement of the heart wall based on both the phase and magnitude of the demodulated signal to determine the instantaneous position of the object so that the vibration velocity of the moving object can be accurately estimated. By this method, small vibrations of the heart wall with small amplitudes less than 100 /spl mu/m on the motion resulting from a heartbeat with large amplitude of 10 mm can be successfully detected with sufficient reproducibility in the frequency range up to several hundred Hertz continuously for periods of about 10 heartbeats. The resultant small vibration is analyzed not only in the time domain, but also in the frequency domain. As confirmed by the preliminary experiments herein reported, the new method offers potential for research in acoustical diagnosis of heart disease.
使用单个心外膜传感器对心肌增厚进行多普勒测量。
DOI：
10.1152/ajpheart.1983.245.6.h1066
发表时间：
1983
期刊：
The American journal of physiology
影响因子：
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作者：
Hartley,CJ;Latson,LA;Michael,LH;Seidel,CL;Lewis,RM;Entman,ML
通讯作者：
Entman,ML