Results 41 to 50 of about 26,542 (324)
Transmissive multifocal laser speckle contrast imaging through thick tissue
Journal of Innovative Optical Health Sciences, 2023 Laser speckle contrast imaging (LSCI) is a powerful tool for monitoring blood flow changes in tissue or vessels in vivo, but its applications are limited by shallow penetration depth under reflective imaging configuration.
Ruoyu Chen, Peng Miao, Shanbao Tong
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Laser speckle reduction based on angular diversity induced by Piezoelectric Benders [PDF]
Journal of the European Optical Society-Rapid Publications, 2013 Speckle reduction techniques have been investigated in display systems with coherent light sources. We propose a simple but efficient method to reduce speckle via two fast vibrating piezoelectric benders.
Ouyang G. +4 more
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Contribution of speckle noise in near-infrared spectroscopy measurements [PDF]
, 2019 Near-infrared spectroscopy (NIRS) is widely used in biomedical optics with applications ranging from basic science, such as in functional neuroimaging, to clinical, as in pulse oximetry.
Boas, David A. +5 more
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Photonics, 2021 Speckle-free imaging using a multimode fiber has been widely used for imaging systems. Generally, previous work has assumed that all the propagating modes of the fiber are uniformly excited, but the modal power distribution is actually affected by ...
Jun Zhou +8 more
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Quantitative modeling of laser speckle imaging [PDF]
, 2006 We have analyzed the image formation and dynamic properties in laser speckle imaging (LSI) both experimentally and with Monte-Carlo simulation. We show for the case of a liquid inclusion that the spatial resolution and the signal itself are both ...
Alfred Buck +17 more
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State-of-the art of acousto-optic sensing and imaging of turbid media [PDF]
, 2012 Acousto-optic (AO) is an emerging hybrid technique for measuring optical contrast in turbid media using coherent light and ultrasound (US). A turbid object is illuminated with a coherent light source leading to speckle formation in the remitted light ...
Boccara, A.C. +2 more
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Imaging depth and multiple scattering in laser speckle contrast imaging [PDF]
Journal of Biomedical Optics, 2014 Laser speckle contrast imaging (LSCI) is a powerful and simple method for full field imaging of blood flow. However, the depth dependence and the degree of multiple scattering have not been thoroughly investigated. We employ three-dimensional Monte Carlo simulations of photon propagation combined with high resolution vascular anatomy to investigate ...
Mitchell A, Davis +2 more
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A new simulation method for laser speckle imaging to investigate hemodynamics [PDF]
E3S Web of Conferences, 2019 Speckle simulation is a powerful protocol to investigate the properties of speckle and evaluate image processing method. However, only static speckle images can be simulated by available methods without considering time-integrated effect of CCD.
Sang X, Li D, Chen B
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Vessel packaging effect in laser speckle contrast imaging and laser Doppler imaging [PDF]
Journal of Biomedical Optics, 2017 Laser speckle-based techniques are frequently used to assess microcirculatory blood flow. Perfusion estimates are calculated either by analyzing the speckle fluctuations over time as in laser Doppler flowmetry (LDF), or by analyzing the speckle contrast as in laser speckle contrast imaging (LSCI).
Ingemar, Fredriksson, Marcus, Larsson
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Zwitterion-doped liquid crystal speckle reducers for immersive displays and vectorial imaging
Light: Science & Applications, 2023 Lasers possess many attractive features (e.g., high brightness, narrow linewidth, well-defined polarization) that make them the ideal illumination source for many different scientific and technological endeavors relating to imaging and the display of ...
Yihan Jin +6 more
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