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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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Estimating Thoracic Movement with High-Sampling Rate THz Technology.

Christoph Hoog Antink1, Romina Schulz2, Maurice Rohr1

  • 1KIS*MED (AI Systems in Medicine Lab), Technische Universität Darmstadt, 64283 Darmstadt, Germany.

Sensors (Basel, Switzerland)
|June 10, 2023
PubMed
Summary
This summary is machine-generated.

Terahertz (THz) spectroscopy accurately estimates thoracic movement and respiration rate from breathing subjects. This non-contact method offers a precise alternative to electrocardiogram (ECG) derived respiration, achieving a low 1.40 BPM error.

Keywords:
photonicrespiratory rateterahertzunobtrusive sensing

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Area of Science:

  • Biomedical Engineering
  • Physics
  • Respiratory Physiology

Background:

  • Estimating respiration rate is crucial for monitoring patient health.
  • Electrocardiogram (ECG) derived respiration is a common method but has limitations.
  • Non-contact, accurate respiration monitoring is needed.

Purpose of the Study:

  • To evaluate a terahertz (THz) homodyne spectroscopy system for estimating thoracic movement.
  • To compare THz-based respiration estimation with ECG-derived respiration.

Main Methods:

  • A high-sampling rate THz homodyne spectroscopy system was used.
  • Healthy subjects performed breathing at various frequencies.
  • Thoracic movement was estimated from THz phase information.
  • ECG signals were recorded for comparison.

Main Results:

  • The THz system provided usable motion and respiration signals.
  • ECG-derived respiration showed sub-optimal performance for some subjects.
  • THz-based respiration estimation achieved a root mean square error of 1.40 BPM.
  • Good agreement was observed between THz measurements and the protocol.

Conclusions:

  • Terahertz spectroscopy is a viable, accurate method for non-contact respiration monitoring.
  • This THz system surpasses ECG in reliability for respiration assessment.
  • THz technology offers a promising tool for respiratory monitoring applications.