2-FREQUENCY IMPEDANCE PLETHYSMOGRAPH - REAL AND IMAGINARY PARTS

被引：12

作者：

LOZANO, A ^{[1
]}

ROSELL, J ^{[1
]}

PALLASARENY, R ^{[1
]}

机构：

[1] ETSE TELECOMUN, DIV INSTRUMENT & BIOENGN, E-08080 BARCELONA, SPAIN

来源：

MEDICAL & BIOLOGICAL ENGINEERING & COMPUTING | 1990年 / 28卷 / 01期

关键词：

Coherent; Current isolation; demodulation; Impedance plethysmography; Transthoracic impedance; Waveforn synthesiser;

D O I：

10.1007/BF02441675

中图分类号：

TP39 [计算机的应用];

学科分类号：

081203 ; 0835 ;

摘要：

A four-channel impedance plethysmograph has been designed. Impedance signals are obtained at two frequencies by measuring both real and imaginary parts. Particular attention has been paid to the sine wave generation circuits that provide system versatility. The required phase-sensitive demodulation is achieved by means of analogue multiplexers. Results show that there are significant variations in the thoracic equivalent capacitance related to respiration and that there is an increased sensitivity to cardiac activity at low frequencies. © 1990 IFMBE.

引用

页码：38 / 42

页数：5

共 10 条

[1] DUAL-CHANNEL SELF-BALANCING IMPEDANCE PLETHYSMOGRAPH FOR VASCULAR STUDIES [J].

ARENSON, JS ;

COBBOLD, RSC ;

JOHNSTON, KW .

MEDICAL & BIOLOGICAL ENGINEERING & COMPUTING, 1981, 19 (02) :157-164

[2] HYBRID TECHNIQUE IN WAVEFORM GENERATION AND SYNTHESIS [J].

EVANS, WA ;

TOWERS, MS .

IEE PROCEEDINGS-G CIRCUITS DEVICES AND SYSTEMS, 1980, 127 (03) :119-128

[3]

Griffiths H, 1987, Clin Phys Physiol Meas, V8 Suppl A, P103, DOI 10.1088/0143-0815/8/4A/014

[4]

Pethig R, 1987, Clin Phys Physiol Meas, V8 Suppl A, P5, DOI 10.1088/0143-0815/8/4A/002

[5] Analysis and assessment of errors in a parallel data acquisition system for electrical impedance tomography [J].

Rosell, J. ;

Murphy, D. ;

Pallas, R. ;

Rolfe, P. .

Clinical Physics and Physiological Measurement, 1988, 9 (SUPPL. A) :93-99

[6]

SHANKAR T M R, 1984, Journal of Clinical Engineering, V9, P129

[7]

SWANSON DK, 1982, MED BIOL ENG COMPUT, V20, P461, DOI 10.1007/BF02442407

[8] ERRORS IN 4-ELECTRODE IMPEDANCE PLETHYSMOGRAPHY [J].

SWANSON, DK ;

WEBSTER, JG .

MEDICAL & BIOLOGICAL ENGINEERING & COMPUTING, 1983, 21 (06) :674-680

[9]

THOMASSET A, 1987, 3RD P EUR S LIF SCI, P323

[10]

TOWERS MS, 1982, IEE PROC-G, V129, P19, DOI 10.1049/ip-g-1.1982.0003

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