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Method and apparatus for measuring and displaying a haemodynamic parameter

  • US 10,448,846 B2
  • Filed: 12/14/2015
  • Issued: 10/22/2019
  • Est. Priority Date: 12/16/2014
  • Status: Active Grant
First Claim
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1. A method of measuring and displaying a haemodynamic parameter comprising the steps of:

  • acquiring a video image of a region of interest on the skin of a subject;

    processing the video image to obtain a first remote reflectance photoplethysmogram signal for the region of interest;

    performing signal averaging on the first remote reflectance photoplethysmogram signal for the region of interest to obtain a reference average pulse waveform;

    splitting the region of interest into plural subsidiary regions of interest and processing the video signal to obtain a subsidiary remote reflectance photoplethysmogram signal for each subsidiary region of interest, performing signal averaging on each subsidiary remote reflectance photoplethysmogram signal to obtain a subsidiary average pulse waveform for each subsidiary region of interest;

    determining the phase difference between each subsidiary average pulse waveform and the reference average pulse waveform; and

    displaying as said haemodynamic parameter the phase difference for each subsidiary region of interest.

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