Multifrequency device for measurement of the complex electrical bio-impedance-design and application
Multifrequency device for measurement of the complex electrical bio-impedance-design and application
复制标题
复杂电生物阻抗测量多频装置的设计与应用
DOI：
10.1109/rcembs.1995.508682
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
J. Węglarz
中科院分区：
文献类型：
--
作者：
T. Palko;F. Bialokoz;J. Węglarz
设计了一种用于测量生物组织复杂电阻抗模量和相移的多频装置。阻抗测量采用四极电流法，电流幅值为1ma。采用改进的“过零”法获得相位。该设备工作频率范围为2khz至200khz（分两个子范围），具有手动和自动频率控制。利用该阻抗装置在2 ~ 200 kHz频率范围内采用Kubicek法测量经胸阻抗的模量|Z/sub 0/|和相移/spl phi/， |Z/sub 0/|的平均值分别从30.7到20.2 /spl Omega/和/spl phi/从4.9到10.4/spl deg/变化。在阻抗心电图通常使用的较窄范围内（20-100 kHz）， /spl phi/的变化为4/spl度/。这表明有必要建立阻抗心动图法中经胸阻抗测量的标准，并且只使用一个选定的频率。该装置可用于生物阻抗光谱测量，细胞外液的测定，检查由于通气或心脏运动引起的/spl Delta/Z和/spl Delta//spl phi/。
A multifrequency device for measurement of the modulus and phase shift of complex electrical impedance of the biological tissue has been designed. Impedance measurement is based on the tetrapolar current method with the current amplitude of 1 mA. Phase is obtained using of the modified "zero-crossing" method. The device operates in the frequency range from 2 kHz to 200 kHz (in two sub-ranges) with manual and automatic frequency control. The impedance device was used for the measurement of the modulus |Z/sub 0/| and phase shift /spl phi/ of the transthoracic impedance by Kubicek's method in the frequency range of 2 to 200 kHz the mean values of |Z/sub 0/| changes from 30.7 to 20.2 /spl Omega/ and /spl phi/ respectively from 4.9 to 10.4/spl deg/. In the narrower range usually used in impedance cardiography (20-100 kHz) the change of /spl phi/ is 4/spl deg/. This indicates a necessity to establish a standard for the transthoracic impedance measurement in impedance cardiography method and to use only one chosen frequency. The device can be used for bioimpedance spectroscopic measurements, determination of the extracellular fluids, examination of /spl Delta/Z and /spl Delta//spl phi/ due to ventilation or motion of the heart.