Contactless recording of cardiac related thoracic conductivity changes
Contactless recording of cardiac related thoracic conductivity changes
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非接触式记录心脏相关的胸廓电导率变化
DOI：
10.1109/iembs.1995.579839
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
P. Savard
中科院分区：
文献类型：
--
作者：
R. Guardo;S. Trudelle;A. Adler;C. Boulay;P. Savard
用由3.5 cm半径线圈、4 MHz振荡器和有源RF电压表组成的电磁传感器实时记录胸部电导率分布中的心脏相关变化。传感器的操作基于测量由心脏区域中的涡流损耗引起的边缘RF振荡器的幅度变化。6名正常受试者在多个时段（1小时至1个月）记录的信号显示出良好的重复性。用放置在胸骨上的线圈记录的信号的平均SNR为34 dB。这种类型的传感器的可能应用是用于左心室射血分数的无创连续评估。
Cardiac related changes in the electrical conductivity distribution of the thorax were recorded in real-time with an electromagnetic sensor consisting of a 3.5 cm radius coil, a 4 MHz oscillator and an active RF voltmeter. Operation of the sensor is based on measuring changes in the amplitude of a marginal RF oscillator, caused by eddy current losses in the heart region. Signals recorded from 6 normal subjects in multiple sessions (1 hour to 1 month) showed good repeatability. The average SNR for signals recorded with the coil placed over the sternum was 34 dB. A possible application of this type of sensor is for non-invasive continuous assessment of left ventricular ejection fraction.