Results 151 to 160 of about 25,478 (173)

Efficient Processing of Laser Speckle Contrast Images

IEEE Transactions on Medical Imaging, 2008
Though laser speckle contrast imaging enables the measurement of scattering particle dynamics with high temporal resolution, the subsequent processing has previously been much slower. In prior studies, generating a laser speckle contrast image required about 1 s to process a raw image potentially collected in 10 ms or less.
W. James Tom, Adrien Ponticorvo, Andrew K. Dunn 0001   +2 more
openaire   +2 more sources

Depth resolution in multifocus laser speckle contrast imaging

Optics Letters, 2021
Laser speckle contrast imaging (LSCI) can be used to evaluate blood flow based on spatial or temporal speckle statistics, but its accuracy is undermined by out-of-focus image blur. In this Letter, we show how the fraction of dynamic versus static light scattering is dependent on focus, and describe a deconvolution strategy to correct for out-of-focus ...
Shuqi Zheng, Sheng Xiao, Lisa Kretsge, Alberto Cruz-Martín, Jerome Mertz   +4 more
openaire   +2 more sources

Laser Speckle Contrast Imaging: Theory, Instrumentation and Applications

IEEE Reviews in Biomedical Engineering, 2013
Laser Speckle Contrast Imaging (LSCI) is a wide field of view, non scanning optical technique for observing blood flow. Speckles are produced when coherent light scattered back from biological tissue is diffracted through the limiting aperture of focusing optics.
Janaka Senarathna, Abhishek Rege, Nan Li   +2 more
exaly   +3 more sources

Calibration in laser speckle contrast imaging

Biomedical Optics, 2006
We provided a novel calibration procedure in laser speckle contrast imaging that can efficiently compensate systematic errors in speckle contrast caused by speckle/pixel size mismatch and static scatters in the tissue.
Shuai Yuan, Andrew K. Dunn, David A. Boas   +2 more
openaire   +1 more source

Contrast-enhanced imaging of cerebral vasculature with laser speckle

Applied Optics, 2007
High-resolution cerebral vasculature imaging has applications ranging from intraoperative procedures to basic neuroscience research. Laser speckle, with spatial contrast processing, has recently been used to map cerebral blood flow. We present an application of the technique using temporal contrast processing to image cerebral vascular structures with ...
K, Murari, N, Li, A, Rege, X, Jia, A, All, N, Thakor   +5 more
openaire   +2 more sources

Laser speckle contrast imaging for assessment of liver microcirculation

Microvascular Research, 2013
Laser speckle contrast imaging (LSCI) is a novel technique for microcirculation imaging not previously used in the liver. The aim of the present experimental study was to evaluate the use of LSCI for assessing liver microcirculation.In six male Wistar rats, the median liver lobe was exposed through a midline laparotomy.
Sturesson, Christian, Milstein, Dan M. J., Post, Ivo C. J. H., Maas, Adrie M., van Gulik, Thomas M.   +4 more
openaire   +2 more sources

Detrimental effects of speckle-pixel size matching in laser speckle contrast imaging

Optics Letters, 2008
Through a series of simulations and experiments, we demonstrate that the frequently cited criterion of matching speckle size to detector element (pixel) size in laser speckle contrast imaging (LSCI) has the detrimental effect of reducing the contrast and thereby decreasing the variation in the laser speckle contrast image.
Sean J Kirkpatrick, Donald D Duncan
exaly   +3 more sources

Noise Model for Laser Speckle Contrast Imaging

Biomedical Optics, 2006
We have developed a noise model for laser speckle contrast imaging. Its dependence on the sliding window size, exposure time, beta, and correlation time is revealed. The accuracy of the model is tested with experiments.
Chao Zhou, Turgut Durduran, Tamas Szabados, Guoqiang Yu, Regine Choe, Xiaoman Xing, Joel H. Greenberg, Douglas J. Durian, Arjun G. Yodh   +8 more
openaire   +1 more source

Multiscale Entropy Study of Medical Laser Speckle Contrast Images

IEEE Transactions on Biomedical Engineering, 2013
Laser speckle contrast imaging (LSCI) is a noninvasive full-field optical imaging technique that gives a 2-D microcirculatory blood flow map of tissue. Due to novelty of commercial laser speckle contrast imagers, image processing of LSCI data is new. By opposition, the numerous signal processing works of laser Doppler flowmetry (LDF) data-that give a 1-
Humeau-Heurtier, Anne, Mahé, Guillaume, Durand, Sylvain, Abraham, P.   +3 more
openaire   +3 more sources

The contrast of femtosecond laser speckles in the image plane

SPIE Proceedings, 2005
We put forward the concept of femtosecond laser speckles and studied twelve speckle patterns produced by four aluminium sheets with different surface roughness under illumination of three laser sources of one continuous wave laser and two other femtosecond pulsed lasers with FWHM widths of 36fs and 12fs, respectively. The femtosecond laser speckles are
Wenjun Liu, Changhe Zhou
openaire   +1 more source