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Blood Flow Imaging with Ultrafast Doppler
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Minimizing the duration of laser Doppler flowmetry recordings while maintaining wavelet analysis quality: A

C Reynès1, A Vinet1, O Maltinti1

  • 1Avignon Université, LAPEC EA4278, F-84000 Avignon, France.

Microvascular Research
|June 27, 2020
PubMed
Summary

Minimal recording durations for laser Doppler flowmetry (LDF) wavelet analysis (WA) were determined. For myogenic, neurogenic, and endothelial bands, specific LDF recording lengths are essential for accurate vascular tone assessment.

Keywords:
Basal skin blood flowFlowmotionLaser Doppler flowmeterPassing-bablok regressionWavelet analysis

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Area of Science:

  • Physiology
  • Biomedical Engineering
  • Medical Research

Background:

  • Laser Doppler flowmetry (LDF) non-invasively measures cutaneous blood perfusion.
  • Wavelet analysis (WA) of LDF signals provides insights into vascular tone and physiological compartments.
  • Optimal recording duration for quality WA of LDF signals remains undefined.

Purpose of the Study:

  • To determine the minimum recording duration for accurate wavelet analysis (WA) of low-frequency bands in laser Doppler flowmetry (LDF) signals.
  • To establish site-specific recording length recommendations for myogenic, neurogenic, and endothelial frequency bands.

Main Methods:

  • Sixty-five healthy participants underwent 20-minute basal LDF recordings on the forearm and foot.
  • LDF recordings were progressively shortened minute-by-minute to assess the impact of duration on WA.
  • Wavelet power spectrum analysis focused on the three lowest frequency bands (myogenic, neurogenic, endothelial).

Main Results:

  • A minimum of 10 minutes of LDF recording is required for myogenic event analysis at both anatomical sites.
  • For forearm recordings, 15 minutes are needed for the neurogenic band and 10 minutes for the endothelial band.
  • Foot recordings require 13 minutes to adequately assess the neurogenic and endothelial bands.

Conclusions:

  • Optimal LDF recording duration for quality WA varies by anatomical site and frequency band.
  • Forearm studies necessitate at least 15 minutes, while foot studies require 13 minutes for comprehensive low-frequency band analysis.
  • These findings provide crucial guidance for designing future LDF studies to ensure reliable vascular tone assessment.