Detection of Cardiovascular Parameters with LDV

Laura Mignanelli, M.Sc.

State of the art/Motivation

• The heartbeat originates characteristic vibrations on the thorax which can be measured with a Laser-Doppler-Vibrometer (LDV)
• The detection of the heartrate, heartrate variability and the pulse wave velocity etc. were already demonstrated
• The detection of the PR time is also possible

Aim of the work

• Comprehensive understanding of how and with what uncertainty vibration measurements on the human body can be used for medical diagnosis

Methods

• Application of a single point vibrometer and a robot supported scanning-vibrometer
• Comparison of the vibration signals with electrocardiographic signals
• Development of algorithms for parameter recognition
• Analysis of the influence of the measuring condition for the determination of the characteristic parameters
• Multichannel-Vibrometer to study the vibration in several points
• Analysis of 3D vibration direction with multichannel vibrometer

Results

• In addition to the heartbeat, the detection of the contraction of the atria can be identified
• Detection of AV-blocks with the Laser Doppler vibrometry is possible
• Recommended settings for filters and set up are obtained
• The velocity vector of skin movement changes direction during a complete heartbeat: no uniform measurement direction
• Determination of the uncertainty contribution of the laser beam orientation for laser Doppler vibrometer measurements on the carotid artery

Outlook

• Use the vibrations generated in the human body for medical diagnosis
• Determination of the uncertainty contribution of laser beam orientation for laser Doppler vibrometer measurements on the chest
• Investigation of the dependence of vibration on anatomical and physiological features

Publications

• L. Mignanelli and C. Rembe:
  Non-contact Health Monitoring with LDV
  ^{In: K. Kroschel (Ed.). Laser Doppler Vibriometry for Non-Contact Diagnosis, Ch.1, pp 1-8, Springer Verlag, New York,2020 DOI: 10.1007/978-3-030-46691-6}
• C. Rembe and L. Mignanelli:
  Introduction to Laser Doppler Vibrometry
  ^{In: K. Kroschel (Ed.). Laser Doppler Vibriometry for Non-Contact Diagnosis, Ch.2, pp 9-21, Springer Verlag, New York,2020 DOI: 10.1007/978-3-030-46691-6}·
• L. Mignanelli and C. Rembe:
  VCG Signals on the Thorax and Detection of the PR-Interval
  ^{In: K. Kroschel (Ed.). Laser Doppler Vibriometry for Non-Contact Diagnosis Ch.6, pp 155-166, Springer Verlag, New York,2020 DOI: 10.1007/978-3-030-46691-6}
• L. Mignanelli and C. Rembe:
  Uncertainty contribution of the laser-beam orientation for laser Doppler vibrometer measurements at the carotid artery.
  ^{In: Journal of Physics: Conference Series, Vol. 1149, Conference 1, 2018.
  DOI: 10.1088/1742-6596/1149/1/012025.}
• L. Mignanelli, G. Bauer, M. Klarmann, H. Wang and C. Rembe:
  Influence of the measuring condition on vibrocardiographic signals acquired on the thorax with a laser Doppler vibrometer. 
  ^{In: Proceedings of the European Conferences on Biomedical Optics (ECBO), Munich, Germany, June 2017, p. 1041105. 
  DOI: 10.1117/12.2282894 .}
• L. Mignanelli, A. Luik, K. Kroschel, L. Scalise and C. Rembe: 
  Auswertung von Vibrometersignalen zur Bestimmung kardiovaskulärer Parameter. 
  ^{In: tm - Technisches Messen. Vol. 83, pp. 462-473, Sept. 2016. 
  DOI: 10.1515/teme-2015-0113 .}
• L. Mignanelli and C. Rembe: 
  Algorithm for Automatic Detection of the Cardiovascular Parameter PR-Interval from LDV-Velocity Signals. 
  ^{In: Proceedings of the 12th Int. Conference on Vibration Measurements by Laser and Noncontact Techniques, Ancona, Italy, June/July 2016. 
  DOI: 10.1063/1.4952666 .}
• A. Luik, L. Mignanelli, K. Kroschel, C. Schmitt, C. Rembe and L. Scalise: 
  Laser Doppler Vibrometry for Non-Contact Identification and Classification of AV-Blocks. 
  ^{Future Cardiology. Vol. 12, pp. 269-279, May 2016. 
  DOI: 10.1063/1.4879597 .}
• L. Mignanelli, A. Luik, K. Kroschel, L. Scalise and C. Rembe
  Laser Doppler Vibrometer in der Medizin
  ^{in Proceedings of the XXIX. Messtechnisches Symposium des AHMT, Ilmenau, Germany, Sept. 2015, pp. 107-114.}

see also: Photoacoustic imaging with Laser Doppler Vibrometry