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＜departmental bulletin paper＞
Heart beat detection under the noncontact and clothing condition by means of microwave reflectometry: Future applications and perspectives
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| Abstract | Electrocardiogram (ECG) is a routine clinical examination for the cardiovascular disease diagnosis. There have been many alternatives of ECG to detect heart beats and pulse waves. Although noncontact ...device monitoring heart beats has been attempted so far, signal processing to eliminate motion artifacts is not satisfactory. Recently, our laboratory has developed a microwave reflectometry sensing skin microvibration due to heart beats and pulse waves. Auto-gain control system, signal averaging, template-matching system and signal cross-correlation technique obtained by multiple reflectometric sensors enabled motion artifact elimination, signal peak detection and real-time processing. This microwave reflectometry is useful in many clinical practice and lifestyle. Heart rate variability (HRV) reflects cardiac autonomic nerve functions, and conventional ECG monitoring is a major tool evaluating HRV. However, patients have to be tethered, and skin-electrode interface yields serious artifacts in long-term ECG monitoring. This microwave refrectometry demonstrated frequency domain HRV that was closely correlated with HRV obtained simultaneously by conventional ECG in healthy volunteers under mental arithmetic task. Microwave refrectometry can also detect the heart beats irregularity caused by arrhythmia and cardiac arrest by setting the specific algorithms. Therefore, this microwave refrectometry is useful in the home monitoring of the old persons living alone without invading their personal life and privacy. More sophisticated improvements are warranted for the wide use of this device as a convenient compact module in near future.show more |
| Table of Contents | １．はじめに ２．マイクロ波反射計のしくみ ３．マイクロ波反射計の安全性と倫理性 ４．マイクロ波反射計による心拍変動の評価 ５．マイクロ波反射計による不整脈の検出 ６．マイクロ波反射計による生存確認 ７．他の研究機関との比較 ８．おわりに |
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| Created Date | 2020.03.26 |
| Modified Date | 2021.03.12 |