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A new single-fibre laser Doppler flowmeter based on digital signal processing

H Cai1, H Pettersson, H Rohman

  • 1Department of Biomedical Engineering, Linköping University, University Hospital, Sweden.

Medical Engineering & Physics
|October 1, 1996
PubMed
Summary

A new personal computer-based laser Doppler flowmeter was developed for skeletal muscle blood perfusion. This system offers real-time visualization and flexible data analysis, outperforming previous methods.

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Area of Science:

  • Biomedical Engineering
  • Physiology
  • Medical Devices

Background:

  • Accurate measurement of skeletal muscle blood perfusion is crucial for physiological studies and clinical diagnostics.
  • Existing laser Doppler flowmetry systems may have limitations in terms of usability, data processing, and real-time feedback.

Purpose of the Study:

  • To design and evaluate a novel laser Doppler flowmeter system integrated with a personal computer and digital signal processor.
  • To enhance the detection and real-time analysis of blood perfusion in skeletal muscle.

Main Methods:

  • Development of a system utilizing an infrared laser diode and optical fiber for muscle insertion.
  • Implementation of a PC-based digital signal processing unit for laser Doppler algorithm emulation.
  • Utilization of Labwindows software for a graphical user interface, enabling real-time visualization and data saving.

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Main Results:

  • The system demonstrated linear relationships between particle velocity and flow (0-5 mm s-1) in model studies.
  • Real-time visualization of Doppler signal power spectral density and flow values was achieved.
  • The new system showed advantages over previously used systems in brachioradial muscle blood flow measurements.

Conclusions:

  • The developed PC-based laser Doppler flowmeter provides an effective and user-friendly tool for assessing skeletal muscle blood perfusion.
  • The system's flexibility in software-based signal processing and data presentation facilitates advanced analysis.
  • This novel system represents an improvement for blood flow monitoring in research and potentially clinical settings.