Results 51 to 60 of about 10,506 (277)

Investigation on Speckle-Free Imaging at the Output of a Multimode Fiber under Various Mode Excitation Conditions

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, Zichun Le, Yanyu Guo, Zongshen Liu, Qiyong Xu, Yanxin Dai, Jiayu Deng, Jiapo Li, Di Cai   +8 more
doaj   +1 more source

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., Akram M. N., Wang K., Tong Z., Chen X. Y.   +4 more
doaj   +1 more source

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

Effect of vascular structure on laser speckle contrast imaging

Biomedical Optics Express, 2020
Laser speckle contrast imaging (LSCI) is a powerful tool for non-invasive, real-time imaging of blood flow in tissue. However, the effect of tissue geometry on the form of the electric field autocorrelation function and speckle contrast values is yet to be investigated.
Chakameh Z. Jafari, Colin T. Sullender, David R. Miller, Samuel A. Mihelic, Andrew K. Dunn   +4 more
openaire   +2 more sources

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, Nathan P. Spiller, Chao He, Grahame Faulkner, Martin J. Booth, Steve J. Elston, Stephen M. Morris   +6 more
doaj   +1 more source

High speed perfusion imaging based on laser speckle fluctuations [PDF]

, 2010
Noninvasive methods to visualize blood flow in tissue are important in the clinical environment. Most methods use dynamic speckles to measure the level of perfusion.
Draijer, Matthijs Johannes
core   +1 more source

Coherent Matrix-Based Approach for Evaluation of First-Order Speckle Intensity Statistics and Its Application for Speckle Suppression

IEEE Photonics Journal, 2022
The existing approach for evaluating the statistical characteristics of speckle intensity distribution is applicable only to completely decorrelated laser beams.
Qiyong Xu, Anatoliy Lapchuk, Zichun Le, Di Cai, Jun Zhou, Zongshen Liu, Ivan Gorbov, Andriy Kryuchyn   +7 more
doaj   +1 more source

The dependence of speckle contrast on velocity: a numerical study

Journal of the European Optical Society-Rapid Publications, 2022
We study how the speckle contrast depends on scatterer velocity, with the goal of further developing laser speckle imaging as a quantitative measurement technique. To that end, we perform interferometric computer simulations on a dilute plug flow.
van As Kevin, Simons Bram A., Kleijn Chris R., Kenjeres Sasa, Bhattacharya Nandini   +4 more
doaj   +1 more source

EDNRB‐dependent endothelin signaling reduces proliferation and promotes proneural‐to‐mesenchymal transition in gliomas

Molecular Oncology, EarlyView.
Glioma cells mainly express the endothelin receptor EDNRB, while EDNRA is restricted to a perivascular tumor subpopulation. Endothelin signaling reduces glioma cell proliferation while promoting migration and a proneural‐to‐mesenchymal transition associated with poor prognosis. This pathway activates Ca2+, K+, ERK, and STAT3 signalings and is regulated
Donovan Pineau, Leonor Garcia, Hugo Arnold, Antonija Hanžek, Maialen Arrieta, Laurent R Gauthier, Christine Granotier‐Beckers, François D Boussin, Amaury Herbet, Marie Hautière, Valentin Asei‐Ceschino, Clémentin Jacques, Laura Brard, Thomas Harnois, Valérie Coronas, Bruno Constantin, Aurélien Chatelier, Jean Chemin, Serge Urbach, Martial Seveno, Szimonetta Hideg, Chantal Ripoll, Kasandra Aguilar‐Cázarez, Min Zheng, Guo‐Hao Huang, Sheng‐Qing Lv, Lei Zhang, Philippe Rondard, Laurent Prezeau, Jean‐Philippe Pin, Hugues Duffau, Luc Bauchet, Valérie Rigau, Franck Denat, Charles Truillet, Didier Boquet, Jean‐Philippe Hugnot   +36 more
wiley   +1 more source

Synthetic exposure with a CMOS camera for multiple exposure speckle imaging of blood flow

Scientific Reports, 2022
Speckle contrast imaging is an established technique to obtain relative blood flow maps over wide fields of view. A major improvement of the method relies on the acquisition of raw speckle images at different exposure times but requires simultaneous ...
M. Chammas, F. Pain
doaj   +1 more source