Open AccessQuantitatively assessing flow velocity by the slope of the inverse square of the contrast values versus camera exposure time
Author(s) -
Jialin Liu,
Hongchao Zhang,
Zhonghua Shen,
Jian Lü,
Xiaowu Ni
Publication year - 2014
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.019327
Subject(s) - speckle pattern , contrast (vision) , optics , inverse , flow velocity , flow (mathematics) , diffusion , multiple exposure , speckle imaging , brownian motion , physics , mathematics , mechanics , geometry , statistics , thermodynamics
The slope of the inverse square of the contrast values versus camera exposure time at multi-exposure speckle imaging (MESI) can be a new indicator of flow velocity. The slope is linear as the diffuse coefficient in Brownian motion diffusion model and the mean velocity in ballistic motion model. Combining diffuse speckle contrast analysis (DSCA) and MESI, we demonstrate theoretically and experimentally that the flow velocity can be obtained from this slope. The calculation results processes of the slop don't need tedious Newtonian iterative method and are computationally inexpensive. The new indicator can play an important role in quantitatively assessing tissue blood flow velocity.