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  4. Systematic Investigation of Heart Sound Propagation using Continuous Wave Radar
 
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Systematic Investigation of Heart Sound Propagation using Continuous Wave Radar

Publikationstyp
Journal Article
Date Issued
2025-01-16
Sprache
English
Author(s)
Oesten, Marie  
Abel, Luca  
Albrecht, Nils Christian  orcid-logo
Hochfrequenztechnik E-3  
Richer, Robert  
Langer, Dominik  
Hochfrequenztechnik E-3  
Grießhammer, Stefan  
Ghanem, Khalida  
Steigleder, Tobias  
Ostgathe, Christoph  
Kölpin, Alexander  orcid-logo
Hochfrequenztechnik E-3  
Eskofier, Björn  
TORE-URI
https://tore.tuhh.de/handle/11420/53659
Journal
IEEE Journal of Biomedical and Health Informatics  
Citation
IEEE Journal of Biomedical and Health Informatics (in Press): (2025)
Publisher DOI
10.1109/JBHI.2025.3530821
Scopus ID
2-s2.0-85215415936
Publisher
IEEE
Monitoring the propagation of mechanical cardiac signals throughout the body is crucial for assessing cardiovascular health. A common drawback of current gold standard methods for vital sign monitoring is the necessity for continuous skin contact. Radar-based sensing offers a promising alternative by enabling contactless measurement of cardiac activity, including heart sound signals. As previous research has primarily focused on deriving signals from proximal body regions, insights into heart sound propagation to peripheral areas are lacking. To address this, we systematically investigated whether radar-based heart sound detection and propagation measurement is feasible across the whole body. We recorded heart sounds in N=22 participants sequentially at eleven locations using a custom-built continuous-wave radar system and phonocardiogram as heart sound gold standard. Additionally, an electrocardiogram was acquired as reference for overall heart activity. After synchronization and preprocessing, we manually segmented the heart sounds and extracted temporal characteristics from ensemble-averaged signals. Our findings show that heart sounds can be detected across the entire body with the radar-based as well as the gold standard system. Furthermore, the heart sounds’ temporal characteristics vary between measurement locations. As the distance to the heart increases, we observed significantly increased propagation time intervals. This finding is consistent across both systems, exhibiting a strong agreement for the first heart sound (r = 0.73, p < 0.001) and a moderate agreement for the second heart sound (r = 0.56, p < 0.001). In conclusion, our work is the first to demonstrate that radar-based systems are feasible for contactless evaluation of heart sound propagation, offering new possibilities for research and health monitoring.
Subjects
biomedical radar | full-body | hemodynamic evaluation | phonocardiogram
DDC Class
621.3: Electrical Engineering, Electronic Engineering
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