Results 1 to 10 of about 21,993 (294)
Nonlinear ultrasound imaging of nanoscale acoustic biomolecules. [PDF]
Appl Phys Lett, 2017 Ultrasound imaging is widely used to probe the mechanical structure of tissues and visualize blood flow. However, the ability of ultrasound to observe specific molecular and cellular signals is limited.
Maresca D +7 more
europepmc +6 more sources
Nonlinear Ultrasound Imaging Modeled by a Westervelt Equation
SIAM Journal on Applied Mathematics, 2022 We consider the ultrasound imaging problem governed by a nonlinear wave equation of Westervelt type with variable wave speed. We show that the coefficient of nonlinearity can be recovered uniquely from knowledge of the Dirichlet-to-Neumann map. Our proof
Sebastian Acosta +2 more
exaly +5 more sources
Nonlinear Ultrasound Crack Detection with Multi-Frequency Excitation—A Comparison [PDF]
Sensors, 2021 Nonlinear ultrasound crack detection methods are used as modern, non-destructive testing tools for inspecting early damages in various materials. Nonlinear ultrasonic wave modulation, where typically two or more frequencies are excited, was demonstrated ...
Frank Mevissen, Michele Meo
doaj +2 more sources
Quantitative tissue perfusion imaging using nonlinear ultrasound localization microscopy [PDF]
Scientific Reports, 2022 Ultrasound localization microscopy (ULM) is a recent advancement in ultrasound imaging that uses microbubble contrast agents to yield vascular images that break the classical diffraction limit on spatial resolution.
Jennifer N. Harmon +5 more
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Simulation of Three Constitutive Behaviors Based on Nonlinear Ultrasound
Applied Sciences, 2020 Nonlinear ultrasound has attracted more and more attention. In classical acoustic nonlinear theory, the source of nonlinearity is the change of constitutive relation of materials.
Zaifu Zhan +5 more
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Weakly nonlinear focused ultrasound in viscoelastic media containing multiple bubbles
Ultrasonics Sonochemistry, 2023 To facilitate practical medical applications such as cancer treatment utilizing focused ultrasound and bubbles, a mathematical model that can describe the soft viscoelasticity of human body, the nonlinear propagation of focused ultrasound, and the ...
Shunsuke Kagami, Tetsuya Kanagawa
doaj +2 more sources
Ultrasonics Sonochemistry, 2022 A physico-mathematical model composed of a single equation that consistently describes nonlinear focused ultrasound, bubble oscillations, and temperature fluctuations is theoretically proposed for microbubble-enhanced medical applications.
Shunsuke Kagami, Tetsuya Kanagawa
doaj +3 more sources
Bolt assessment of wind turbine hub using nonlinear ultrasound methods [PDF]
Wind Engineering, 2021 This work evaluates various nonlinear ultrasound methods for in situ structural health monitoring of the loosened state of a four-bolt structure found on large-scale wind turbines.
Gian Piero Malfense Fierro, Michele Meo
exaly +2 more sources
Ultrasonics SonochemistryDual-frequency ultrasound has been widely employed to enhance and regulate acoustic droplet vaporization (ADV) but the role of ultrasonic nonlinear effects on it remains unclear.
Yubo Zhao, Yi Feng, Liang Wu
doaj +3 more sources
Nonlinear laser ultrasound formation in silicon
AIP Advances, 2016 In this paper, the mechanisms of laser ultrasound response formation in monocrystalline silicon are discussed. The ultrasound waves in the test specimen were generated with laser pulses of two different wavelengths and registered with a piezoelectric ...
Kateryna Voitenko +10 more
doaj +2 more sources