Comparison of the impedance cardiogram with continuous wave radar using body-contact antennas

Dilpreet Buxi, Rahul Dugar, Jean-Michel Redoute, Mehmet Rasit Yuce

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

6 Citations (Scopus)


This paper describes a continuous wave (CW) radar system with body-contact antennas and basic signal processing. The goal is to assess the signals' reproducibility across different subjects as well as a respiration cycle. Radar signals using body-contact antennas with a carrier frequency of 868 MHz are used to acquire the cardiac activity at the sternum. The radar I and Q channel signals are combined to form their magnitude. Signals are collected from six healthy males during paced breathing conditions. The electrocardiogram (ECG) and impedance cardiogram (ICG) signals are acquired simultaneously as reference. The chosen feature in the radar signal is the maximum of its second derivative, which is closest to the ICG B-point. The median and mean absolute errors in pre-ejection period (PEP) in milliseconds between the ICG's B-point and chosen feature in the radar signal range from -6-119.7 ms and 7.8-62.3 ms for all subjects. The results indicate that a reproducible radar signal is obtained from all six subjects. More work is needed on understanding the origin of the radar signals using ultrasound as a comparison.

Original languageEnglish
Title of host publication2017 39th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC 2017)
EditorsEung Je Woo, Yuan-ting Zhang, Thomas Penzel
Place of PublicationPiscataway NJ USA
PublisherIEEE, Institute of Electrical and Electronics Engineers
Number of pages4
ISBN (Electronic)9781509028092
ISBN (Print)9781509028108
Publication statusPublished - 13 Sept 2017
EventInternational Conference of the IEEE Engineering in Medicine and Biology Society 2017 - Jeju Island, Korea, South
Duration: 11 Jul 201715 Jul 2017
Conference number: 39th (Proceedings)


ConferenceInternational Conference of the IEEE Engineering in Medicine and Biology Society 2017
Abbreviated titleEMBC 2017
Country/TerritoryKorea, South
CityJeju Island
Internet address

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