Related Experiment Video
Updated: Jul 4, 2026

High-speed Particle Image Velocimetry Near Surfaces
Published on: June 24, 2013
Impact of velocity distribution assumption on simplified laser speckle imaging equation
Julio C Ramirez-San-Juan1, Ruben Ramos-García, Ileana Guizar-Iturbide
1Optics Department, Instituto Nacional de Astrofísica, Optica y Electrónica, Luis Enrique Erro No. 1, Puebla, 72840, México. jcram@inaoep.mx
Abstract:
Since blood flow is tightly coupled to the health status of biological tissue, several instruments have been developed to monitor blood flow and perfusion dynamics. One such instrument is laser speckle imaging. The goal of this study was to evaluate the use of two velocity distribution assumptions (Lorentzian- and Gaussian-based) to calculate speckle flow index (SFI) values. When the normalized autocorrelation function for the Lorentzian and Gaussian velocity distributions satisfy the same definition of correlation time, then the same velocity range is predicted for low speckle contrast (0 < C < 0.6) and predict different flow velocity range for high contrast. Our derived equations form the basis for simplified calculations of SFI values.
More Related Videos
07:20A Novel Approach to Overcome Movement Artifact When Using a Laser Speckle Contrast Imaging System for Alternating Speeds of Blood Microcirculation
Published on: August 30, 2017
10:39Fabrication and Characterization of Thickness Mode Piezoelectric Devices for Atomization and Acoustofluidics
Published on: August 5, 2020
Related Concept Videos
Velocity and Acceleration of a Wave
The velocity of the particles can be obtained by taking the partial derivative of the position equation with respect to time. We can...
Maxwell-Boltzmann Distribution: Problem Solving
This distribution function f(v) is defined by saying that the expected number N (v1,v2) of particles with speeds between v1 and v2 is given by
Distribution of Molecular Speeds
Deriving the Speed of Sound in a Liquid
The speed of sound in fluids can be derived by considering a mechanical wave propagating...