Results 51 to 60 of about 25,478 (173)
Biosensors, 2023 Modern smartphones have been employed as key elements in point-of-care (POC) devices due to remarkable advances in their form factor, computing, and display performances.
Youngkyu Kim +4 more
doaj +1 more source
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
openaire +2 more sources
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
Angular Spectra Tunable Random Lasing for High Contrast Imaging
Advanced Physics Research, 2023 Random lasers with low spatial coherence have important potential applications in speckle‐free imaging and displaying. Here, an angular spectra (AS) tunable random laser is proposed through directly coupling a microcavity with a commercial optical fiber.
Huihui Shen +6 more
doaj +1 more source
Continuous Diffraction of Molecules and Disordered Molecular Crystals [PDF]
, 2017 The diffraction pattern of a single non-periodic compact object, such as a molecule, is continuous and is proportional to the square modulus of the Fourier transform of that object. When arrayed in a crystal, the coherent sum of the continuous diffracted
Ayyer, Kartik +8 more
core +3 more sources
Electrically pumped semiconductor laser with low spatial coherence and directional emission
, 2019 We design and fabricate an on-chip laser source that produces a directional beam with low spatial coherence. The lasing modes are based on the axial orbit in a stable cavity and have good directionality.
Dainty J. C. +8 more
core +1 more source
Light Focusing and Two-Dimensional Imaging Through Scattering Media using the Photoacoustic Transmission-Matrix with an Ultrasound Array [PDF]
, 2014 We implement the photoacoustic transmission-matrix approach on a two-dimensional photoacoustic imaging system, using a 15 MHz linear ultrasound array.
Bossy, Emmanuel +4 more
core +2 more sources
Speckle Theory for Arbitrary Wavefront Illumination in Free-Space Surface Scattering
IEEE Photonics JournalSpeckle has been shown to cause significant degradation to the imaging quality of laser imaging systems. However, in certain complex imaging environments, it can also act as an effective information carrier.
Qiyong Xu +3 more
doaj +1 more source
Super-resolution photoacoustic imaging via flow induced absorption fluctuations
, 2017 In deep tissue photoacoustic imaging the spatial resolution is inherently limited by the acoustic wavelength. We present an approach for surpassing the acoustic diffraction limit by exploiting temporal fluctuations in the sample absorption distribution ...
Arnal, Bastien +4 more
core +3 more sources
International Journal of Optics, 2011 The microcirculation is a complex system, and the visualization of microcirculation has great significance in improving our understanding of pathophysiological processes in various disease conditions, in both clinical and fundamental studies.
Hrebesh M. Subhash
doaj +1 more source