Results 321 to 330 of about 3,214,745 (368)

Tracking and navigation of a microswarm under laser speckle contrast imaging for targeted delivery

Science Robotics
Micro/nanorobotic swarms consisting of numerous tiny building blocks show great potential in biomedical applications because of their collective active delivery ability, enhanced imaging contrast, and environment-adaptive capability.
Qinglong Wang, Qianqian Wang, Zhipeng Ning, K. Chan, Jialin Jiang, Yuqiong Wang, Lin Su, Shuai Jiang, Ben Wang, B. Ip, Ho Ko, T. W. Leung, P. W. Chiu, S. C. H. Yu, Li Zhang   +14 more
semanticscholar   +1 more source

Hadamard speckle contrast reduction

Optics Letters, 2004
The condition for a diffuser to produce the maximum speckle contrast reduction with the minimum number of distinct phase patterns is derived. A binary realization of this optimum diffuser is obtained by mapping the rows or columns of a Hadamard matrix to the phase patterns.
openaire   +2 more sources

Speckle-contrast monitoring of tissue thermal modification

Applied Optics, 2002
Measurements of the contrast value of time-averaged speckle-modulated images of cartilage tissue are used to study tissue thermal modification in the case of laser-light treatment. This modification is related to thermally induced internal stress relaxation in the matrix of the treated tissue.
Dmitry A, Zimnyakov, Dmitry N, Agafonov, Alexander P, Sviridov, Alexander I, Omel'chenko, Liana V, Kuznetsova, Victor N, Bagratashvili   +5 more
openaire   +2 more sources

Speckle contrast of the sum of N partially correlated speckle patterns

Journal of the Optical Society of America A, 2012
In this paper a general method is presented for calculating the theoretical speckle contrast of a sum of correlated speckle patterns, motivated by the need to suppress the presence of speckle in laser projection displays. The method is applied to a specific example, where correlated speckle patterns are created by sequentially passing light through ...
Sigbjørn Vindenes, Egge, Ulf, Österberg, Astrid, Aksnes   +2 more
openaire   +2 more sources

Laser speckle contrast imaging of blood microcirculation in pancreatic tissues during laparoscopic interventions

Quantum electronics (Woodbury, N.Y.), 2020
Laser speckle contrast imaging of the microcirculatory bed of the pancreas is performed, which allows its condition to be assessed and thereby is an additional valuable tool for making a diagnostic decision and dynamically monitoring the effectiveness of
E. V. Potapova, E. Seryogina, V. Dremin, D. Stavtsev, I. Kozlov, E. Zherebtsov, A. Mamoshin, Y. Ivanov, A. V. Dunaev   +8 more
semanticscholar   +1 more source

Heterogeneous Features of Keloids Assessed by Laser Speckle Contrast Imaging: A Cross‐Sectional Study

Lasers in Surgery and Medicine, 2020
Keloids are described as benign dermal fibroproliferative lesions, and vascularization may play a significant role in their pathogenesis. In this study, laser speckle contrast imaging (LSCI) was used to assess perfusion within keloids and surrounding ...
Cheng Chen, Ming-zi Zhang, Nanze Yu, Wen-Chao Zhang, Xiao Long, Youbin Wang, Xiaojun Wang   +6 more
semanticscholar   +1 more source

Influence of geometry on polychromatic speckle contrast

Journal of the Optical Society of America A, 2007
Understanding speckle behavior is very important in speckle metrology application. The contrast of a polychromatic speckle depends not only on surface roughness and the coherence length of a light source, as shown in previous works, but also on optical geometry.
Igor, Markhvida, Lioudmila, Tchvialeva, Tim K, Lee, Haishan, Zeng   +3 more
openaire   +2 more sources

On the equivalence of speckle contrast-based and diffuse correlation spectroscopy methods in measuring in vivo blood flow.

Optics Letters, 2020
We establish the equivalence between laser speckle contrast-based and diffuse correlation spectroscopy methods inin vivo imaging of blood flow using the Volterra integral equation theory.
K. Murali, A. Nandakumaran, H. Varma
semanticscholar   +1 more source

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   +2 more
openaire   +2 more sources

Non-invasive tracking of polarization rotation from speckle contrast using uncorrelated speckle patterns

Journal of Optics, 2020
A technique based on the superposition of two uncorrelated speckle patterns and speckle contrast measurement is proposed and demonstrated to track the polarization rotation of an optical beam behind a scattering layer.
Abhijit Roy, R. Singh, M. Brundavanam
semanticscholar   +1 more source