Laser speckle contrast imaging: Theoretical and practical limitations
Document Type
Article
Publication Date
6-1-2013
Abstract
When laser light illuminates a diffuse object, it produces a random interference effect known as a speckle pattern. If there is movement in the object, the speckles fluctuate in intensity. These fluctuations can provide information about the movement. A simple way of accessing this information is to image the speckle pattern with an exposure time longer than the shortest speckle fluctuation time scale-the fluctuations cause a blurring of the speckle, leading to a reduction in the local speckle contrast. Thus, velocity distributions are coded as speckle contrast variations. The same information can be obtained by using the Doppler effect, but producing a two-dimensional Doppler map requires either scanning of the laser beam or imaging with a high-speed camera: laser speckle contrast imaging (LSCI) avoids the need to scan and can be performed with a normal CCD-or CMOS-camera. LSCI is used primarily to map flow systems, especially blood flow. The development of LSCI is reviewed and its limitations and problems are investigated. © The Authors.
Publication Title
Journal of Biomedical Optics
Recommended Citation
Briers, D.,
Duncan, D.,
Hirst, E.,
Kirkpatrick, S.,
Larsson, M.,
Steenbergen, W.,
Stromberg, T.,
&
Thompson, O.
(2013).
Laser speckle contrast imaging: Theoretical and practical limitations.
Journal of Biomedical Optics,
18(6).
http://doi.org/10.1117/1.JBO.18.6.066018
Retrieved from: https://digitalcommons.mtu.edu/michigantech-p/12008