System for Monitoring Avian Cardiac Output and Breathing Patterns Using Transmission-Type Microwaves

다국어 초록 (Multilingual Abstract)

We report the development of a non-contact monitoring device for avian cardiac output and breathing patterns based on the anterior thoracic air sac pressure that uses transmission-type microwaves (2,400−2,500 MHz, continuous wave). Since the phase waveform represents the dielectric constant change, the phase reflects −j/ωc and the dielectric constant change is related to blood flow. The magnitude waveform is reflected from the electronic resistance of tissues due to the expansion of the anterior thoracic air sac, which mainly consists of the thoracic wall. To confirm these waveforms, pigeons and chickens were used for testing. To validate the output waveforms of the developed transmission- type microwave device, data from esophageal catheters and pressure sensors in the anterior thoracic air sac, abdominal air sac, and intraoral cavity were obtained. The waveform for the esophageal catheter, where electrocardiogram electrodes and an angular velocity sensor were installed, correlates with cardiac output. A heart sound microphone was used to confirm the closing sound of the arterial and mitral valves. The experimental results confirm that a linear waveform synchronized with the cardiac blood flow and the anterior thoracic air sac pressure of birds was obtained using transmission-type microwaves. The proposed device, which can monitor cardiac output and respiratory patterns, may enable the early screening of cytokine storms caused by avian influenza viruses. Existing devices use Doppler radar in the 10 to 77 GHz band; these high frequencies are reflected by the chest wall and do not reach deep into body, making it impossible to monitor the blood flow inside the body.

참고문헌 (Reference)

1 K. Z. Li, "Research on non-contact respiration and heart rate monitoring algorithm based on 77G FMCW radar" 915-920, 2022

2 M. Alizadeh, "Remote heart rate sensing with mm-wave radar" 1-2, 2018

3 A. Mase, "Real-time evaluation of heart rate and heart rate variability using microwave reflectometry" 160-162, 2018

4 K. Higashi, "Precise heart rate measurement using non-contact Doppler radar assisted by machine-learning-based sleep posture estimation" 788-791, 2019

5 L. Ren, "Phase-based methods for heart rate detection using UWB impulse Doppler radar" 64 (64): 3319-3331, 2016

6 H. Tan, "Non-contact heart rate tracking using Doppler radar" 1711-1714, 2012

7 M. Aweda, "Microwave radiation exposures affect cardiovascular system and antioxidants modify the effects" 2 (2): 246-251, 2011

8 J. Leroy, "Microfluidic biosensors for microwave dielectric spectroscopy" 229 : 172-181, 2015

9 F. Farsaci, "Low frequency dielectric characteristics of human blood : A non-equilibrium thermodynamic approach" 188 : 113-119, 2013

10 T. Lauteslager, "Intracranial heart ratedetection using UWB radar" 119-122, 2016

11 T. Dai, "In vivo blood characterization from bioimpedance spectroscopy of blood pooling" 58 (58): 3831-3838, 2009

12 V. Petrović, "High-accuracy real-time monitoring of heart rate variability using 24 GHz continuous-wave doppler radar" 7 : 74721-74733, 2019

13 P. Zhao, "Heart rate sensing with a robot mounted mmwave radar" 2812-2818, 2020

14 N. Simicevic, "FDTD simulation of exposure of biological material to electromagnetic nanopulses" 50 (50): 347-360, 2005

15 G. Li, "Effects of electromagnetic field exposure on electromagnetic properties of biological tissues" 38 (38): 604-610, 2011

16 L. Gun, "Effective permittivity of biological tissue: Comparison of theoretical model and experiment" 2017 : 7249672-,

17 D. Obeid, "Doppler radar for heartbeat rate and heart rate variability extraction" 2011

18 E. Marzec, "Dielectric relaxation of normothermic and hypothermic rat corneas" 101 : 132-137, 2015

19 E. Marzec, "Dielectric properties of a protein-water system in selected animal tissues" 65 (65): 89-94, 2005

20 Y. Llave, "Dielectric properties and model food application of tylose water pastes during microwave thawing and heating" 2015

21 Y. Otaki, "Dielectric permittivity change detects the process of blood coagulation : Comparative study of dielectric coagulometry with rotational thromboelastometry" 145 : 3-11, 2016

22 K. Nakada, "Development and physiological assessments of multimedia avian esophageal catheter system" 5 (5): 121-130, 2018

23 Isao Nakajima ; Sachie Tanaka ; Kokuryo Mitsuhashi ; Jun-ichi Hata ; Tomo Nakajima, "Detecting of Periodic Fasciculations of Avian Muscles Using Magnetic and Other Multimedia Devices" 한국멀티미디어학회 6 (6): 293-302, 2019

24 Isao Nakajima ; Ichiro Kuwahira ; Shuho Hori ; Kokuryo Mitsuhashi, "Correlation of Axillary Artery Pressure and Phase of Esophageal Impedance in Chickens" 한국멀티미디어학회 9 (9): 161-170, 2022

25 J. Sato, "Correlation between microwave and blood pressure response waveforms" 1-2, 2018

26 P. F. Battley, "Contrasting Extreme Long-Distance Migration Patterns in Bar-Tailed Godwits Limosa lapponica"

27 W. J. K. Raymond, "Complex permittivity measurement using capacitance method from 300 kHz to 50 MHz" 46 (46): 3796-3801, 2013

28 H. F. Cook, "A comparison of the dielectric behaviour of pure water and human blood at microwave frequencies" 3 (3): 249-255, 1952