Author:
Shinichi Sato
Affiliation:
Akita University School of Medicine, Japan
Keyword(s):
Non-invasive, piezoelectric transducer (PZT), analogue circuit, heart rate, respiration sounds, mice.
Related
Ontology
Subjects/Areas/Topics:
Applications and Services
;
Biomedical Engineering
;
Biomedical Signal Processing
;
Computer Vision, Visualization and Computer Graphics
;
Medical Image Detection, Acquisition, Analysis and Processing
Abstract:
Cardiac beat detector, which is an analogue circuitry installed in a novel non-invasive system for measuring heart rate in mice by using a piezoelectric transducer (PZT) sensor, performs an critical role in detecting the first heart sound (S1) in heart sounds. The PZT sensor detects heartbeat vibration and converts it to an electrical signal, namely the heart sounds. The measurement in intervals of S1s in the heart sounds is required to calculate heart rate, however, it is not simple because a S1 is a vibrating signal and has multiple peaks, which fluctuate in interval and in magnitude. In addition, respiration sound noise, which has frequency components similar with that of S1, makes S1 detection difficult and complex. The cardiac beat detector made it possible to overcome these problems by transforming multi-peaked S1 signal into a quasi-digital pulse. This technique is also available for the use in humans. Thus, the cardiac beat detector would contribute to the progress in the non
-invasive heart rate measurement when it is installed in various, novel phonocardiogram-based equipments for the use in the fields of clinical and basic science in medicine.
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