Using the Photoplethysmography Technique to Improve the Accuracy of LVET Measurement in the ICG Technique

  • Shing-Hong Liu
  • Zheng-Yu Zhu
  • Shao-Heng Lai
  • Tai-Shen HuangEmail author
Conference paper
Part of the Smart Innovation, Systems and Technologies book series (SIST, volume 110)


The stroke volume is an important cardiac blood flow hydraulic parameter that can be used to assess whether the pump function of the heart is normal. Non-invasive stroke volume measurement is currently performed using impedance cardio plethysmography (ICG). The ICG method is used to detect the amount of changes in the volume of thoracic cavity generated by the heartbeat and to estimate the stroke volume. Left ventricular ejection time (LVET) is an important parameter in stroke volume measurement with ICG technology. However, the ICG signal is susceptible to artificial noise interference, which leads to inaccurate LVET and miscalculation of stroke volume. In order to solve this problem, this paper uses the photoplethysmography (PPG) sensor to measure LVET, and assesses whether the LVET measured by the PPG sensor is more accurate than the LVET measured by the ICG. The results show that using the PPG sensor can indeed improve the accuracy of the LVET measurement, and that the closer the PPG sensor is placed to the heart, the more stable and accurate the measured LVET will be.


Stroke volume Left ventricular ejection time Photoplethysmography 



This research is in part funded by the Ministry of Science and Technology in Taiwan under grants MOST 106-2221-E-324-001. MOST106-2218-E-027-017.


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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • Shing-Hong Liu
    • 1
  • Zheng-Yu Zhu
    • 1
  • Shao-Heng Lai
    • 1
  • Tai-Shen Huang
    • 2
    Email author
  1. 1.Department of Computer Science and Information EngineeringChaoyang University of TechnologyTaichungTaiwan
  2. 2.Department of Industrial DesignChaoyang University of TechnologyTaichungTaiwan

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