Laser speckle contrast imaging: theoretical and practical limitations

By D. Briers, D. Duncan, E. Hirst, S. Kirkpatrick, Marcus Larsson, W. Steenbergen, T. Stromberg, O. Thompson. Journal of Biomedical Optics, 2013

467 citations recorded by the source corpus.

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.

Subfields: Orthopedics and Sports Medicine, Physiology, Radiology, Nuclear Medicine and Imaging

View Paper: https://www.semanticscholar.org/paper/2df1bb64492585197c68774b7f3c605d6bb577af

Citations in the corpus

• Multispectral Biometrics System Framework: Application to Presentation Attack Detection (2020, unknown): “However, when there is motion (such as motion of blood cells through finger veins), the pattern changes at a rate dictated by the velocity of the moving particles and imaging this effect can be used for LSCI [18], [54], [55], [56], [57].”