Results 61 to 70 of about 3,110,122 (363)
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
doaj +1 more source
Sensors, 2023 Speckle Plethysmography (SPG) and Photoplethysmography (PPG) are different biophotonics technologies that allow for measurement of haemodynamics. As the difference between SPG and PPG under low perfusion conditions is not fully understood, a Cold Pressor
Jorge Herranz Olazabal +7 more
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Accelerating speckle suppression by a degenerate cavity laser with an intracavity phase diffuser [PDF]
Nanophotonics Vol. 10, pp. 129-136 (2021), 2020 Fast speckle suppression is crucial for time-resolved full-field imaging with laser illumination. Here, we introduce a method to accelerate the spatial decoherence of laser emission, achieving speckle suppression in the nanosecond integration time scale.
arxiv +1 more source
Wavelet Analysis of the Temporal Dynamics of the Laser Speckle Contrast in Human Skin
IEEE Transactions on Biomedical Engineering, 2020 Objective: Spectral analysis of laser Doppler flowmetry (LDF) signals has been widely used in studies of physiological vascular function regulation. An alternative to LDF is the laser speckle contrast imaging method (LSCI), which is based on the same ...
I. Mizeva +5 more
semanticscholar +1 more source
Laser speckle contrast imaging in biomedical optics [PDF]
Journal of Biomedical Optics, 2010 First introduced in the 1980s, laser speckle contrast imaging is a powerful tool for full-field imaging of blood flow. Recently laser speckle contrast imaging has gained increased attention, in part due to its rapid adoption for blood flow studies in the brain. We review the underlying physics of speckle contrast imaging and discuss recent developments
David A. Boas, Andrew K. Dunn
openaire +3 more sources
Laser Speckle Modeling and Simulation for Biophysical Dynamics: Influence of Sample Statistics
Journal of Biomedical Photonics & Engineering, 2017 Laser speckle is a statistical phenomenon and should be treated as such when establishing experimental parameters for using laser speckle techniques to infer information about the dynamics of a coherently illuminated medium, such as biological tissue ...
Kosar Khaksari, Sean J. Kirkpatrick
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Journal of Biomedical Photonics & Engineering, 2017 The blood microcirculation of the pancreas in rats with diabetes was studied using Laser Speckle Contrast Imaging (LSCI). The impact on blood flow of x-ray contrast “OmnipaqueTM-300” (n = 1.438) and aqueous solution of “OmnipaqueTM-300” (n = 1.407) used ...
Polina A. Timoshina +3 more
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Real-Time Laser Speckle Imaging of Blood Flow with High Gray Level and High Resolution
Shanghai Jiaotong Daxue xuebao, 2023 Laser speckle contrast imaging (LSCI) is a large measurement ranging, real-time, high spatial resolution optical imaging method. Exisiting reserches show that the low gray level (8-bit) and low resolution (752×480 pixels) camera can effectively monitor ...
ZHANG Zelong, ZHANG Yingchao, WU Bo, DONG Wei, FAN Youben
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Speckle noise reduction techniques for high-dynamic range imaging [PDF]
ComptesRendusPhysique8:349-354,2007, 2007 High-dynamic range imaging from space in the visible, aiming in particular at the detection of terrestrial exoplanets, necessitates not only the use of a coronagraph, but also of adaptive optics to correct optical defects in real time. Indeed, these defects scatter light and give birth to speckles in the image plane.
arxiv +1 more source
Many-body localization in one dimensional optical lattice with speckle disorder [PDF]
Phys. Rev. B 102, 134205 (2020), 2020 The many-body localization transition for Heisenberg spin chain with a speckle disorder is studied. Such a model is equivalent to a system of spinless fermions in an optical lattice with an additional speckle field. Our numerical results show that the many-body localization transition in speckle disorder falls within the same universality class as the ...
arxiv +1 more source