Medical and Biological Engineering and Computing

, Volume 27, Issue 6, pp 580–586

Noncontact measurements of avian embryo heart rate by means of the laser speckle: comparison with contact measurements

  • H. Tazawa
  • T. Hiraguchi
  • T. Asakura
  • H. Fujii
  • G. C. Whittow
Instrumentation

Abstract

A new, noncontact system for measuring the heart rate of avian embryos in the egg has been developed using a laser speckle phenomenon. The system was based upon detection of egg movements attributable to cardiac contractions of the embryo by measuring the intensity fluctuation of speckle produced in the proximity of the egg under laser light illumination (i.e. noncontact measurement). The applicability of the noncontact system to determine the heart rate of developing chick embryos was examined simultaneously with a contact system employing an audio cartridge. Both systems were found to be feasible in determining the heart rate of embryos during the late prenatal and paranatal stages. With the aid of adeques signal processing, the measurement of cardiogenic movements of the egg can be used to count the heart rate during the middle stages of incubation.

Key words

Ballistic movement Contact and noncontact measurements Developing chick embryos Electrocardiogram Fibre probe Laser Noninvasive measurement 

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Copyright information

© IFMBE 1989

Authors and Affiliations

  • H. Tazawa
    • 1
  • T. Hiraguchi
    • 1
  • T. Asakura
    • 2
  • H. Fujii
    • 2
  • G. C. Whittow
    • 3
  1. 1.Department of Electronic EngineeringMuroran Institute of TechnologyMuroranJapan
  2. 2.Research Institute of Applied ElectricityHokkaido UniversitySapporo 060, HokkaidoJapan
  3. 3.Department of Physiology, John A. Burns School of MedicineUniversity of HaweiiHonoluluUSA

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