Results 111 to 120 of about 3,110,122 (363)
Speckle temporal stability in XAO coronagraphic images II. Refine model for quasi-static speckle temporal evolution for VLT/SPHERE [PDF]
, 2013 Observing sequences have shown that the major noise source limitation in high-contrast imaging is due to the presence of quasi-static speckles. The timescale on which quasi-static speckles evolve, is determined by various factors, among others mechanical or thermal deformations. Understanding of these time-variable instrumental speckles, and especially
arxiv +1 more source
Biomedical Optics Express, 2019 A multi-step Volterra integral equation-based algorithm was developed to measure the electric field auto-correlation function from multi-exposure speckle contrast data.
K. Murali +3 more
semanticscholar +1 more source
Bone‐wise rigid registration of femur, tibia, and fibula for the tracking of temporal changes
Journal of Applied Clinical Medical Physics, EarlyView.Abstract Background Multiple myeloma (MM) induces temporal alterations in bone structure, such as osteolytic bone lesions, which are challenging to identify through manual image interpretation. The large variation in radiologists' assessments, even at expert centers, further complicates diagnosis.
Arttu Ruohola +5 more
wiley +1 more source
Depth of Field Extension in Laser Speckle Contrast Imaging
IEEE Access, 2020 A new technique that can increase the depth of field (DOF) for in vivo tissue imaging is presented. Extended DOF for the imaging of strongly scattering media is realized through combining laser speckle contrast imaging (LSCI) with light field (LF ...
Xiaohui Ma +5 more
doaj +1 more source
Artificial incoherent speckles enable precision astrometry and photometry in high-contrast imaging [PDF]
, 2015 State-of-the-art coronagraphs employed on extreme adaptive optics enabled instruments, are constantly improving the contrast detection limit for companions at ever closer separations to the host star. In order to constrain their properties and ultimately compositions, it is important to precisely determine orbital parameters and contrasts with respect ...
arxiv +1 more source
Handheld laser speckle contrast perfusion imaging [PDF]
, 2021 Laser speckle contrast imaging (LSCI) is a noninvasive method for evaluation of microcirculatory blood flow. LSCI has a broad medical application such as reconstructive surgery, burns and dermatology. Commercially available LSCI systems are bulky and operate in mounted modality.
openaire +2 more sources
Journal of Applied Clinical Medical Physics, EarlyView.Abstract Purpose This study evaluates the technical feasibility of adapting a surface monitoring system, designed for conventional four‐dimensional computed tomography (4DCT), to an intelligent, breathing‐adapted 4DCT and examines its potential to expand the currently limited range of supported surrogate systems.
Niklas Lackner +4 more
wiley +1 more source
Journal of Biomedical Optics, 2019 . Laser speckle contrast imaging (LSCI) enables video rate imaging of blood flow. However, its relation to tissue blood perfusion is nonlinear and depends strongly on exposure time.
Ingemar Fredriksson +3 more
semanticscholar +1 more source
Advanced Engineering Materials, EarlyView.Spatial distribution of microstructure in Inconel 718 3D‐printed with bidirectional strategy with no rotation and chessboard strategy is studied. The former results in a highly ordered arrangement of coarse grains separated by line clusters of dislocation‐dense fine grains. This arrangement is disrupted by the chessboard strategy.
Jalal Al‐Lami +4 more
wiley +1 more source
Advanced Engineering Materials, EarlyView.In this study, how friction‐welding parameters (rotational speed, etc.) affect the morphology, distribution, and local thickness of the intermetallic compound layer (IMC‐layer) in friction‐welded steel‐aluminum hybrid components is investigated. In the results, it is shown that lower speeds (700 rpm) lead to a more uniform, thinner IMC‐layer (<0.5 μm),
Christoph Kahra +6 more
wiley +1 more source