Results 31 to 40 of about 239,856 (276)

Low frequency acoustic source imaging method based on coprime position non-synchronous measurement

Tongxin xuebao, 2023
In order to solve the problem that the acoustic imaging resolution was low under the condition of low frequency and low SNR due to the limited microphone array aperture and element density, a high resolution imaging method of low frequency and low SNR ...
Juan WEI, Yutao HE, Fangli NING
doaj  

Wavelet-Based Beamforming for High-Speed Rotating Acoustic Source

IEEE Access, 2018
In this paper, a novel wavelet-based beamforming approach is proposed for sensor arrays to produce acoustic images of high-speed rotating sources. First, the associated Green's function is developed based on the Morse wavelet which also accounts for the ...
Wangqiao Chen, Xun Huang
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, Bossy, Emmanuel, Chaigne, Thomas, Katz, Ori, Vilov, Sergey   +4 more
core   +3 more sources

Addressing Non-Uniqueness in Guided Wave Tomography for Limited-View Corrosion Mapping

NDT - Journal of Non-Destructive Testing
Guided wave tomography has proven to be an effective method for detecting pipeline corrosion, providing both location and quantitive estimates of wall thickness loss.
Emiel Hassefras, Arno Volker, Martin Verweij   +2 more
doaj   +1 more source

In-situ monitoring of sub-surface and internal defects in additive manufacturing: A review

Materials & Design, 2022
Additive Manufacturing (AM), or 3D printing, processes depend on a user-defined set of optimized process parameters to create a component. Monitoring and control of AM processes in real-time can help achieve process stability and repeatability to produce
Youssef AbouelNour, Nikhil Gupta
doaj   +1 more source

Theoretical study of Acousto-optical coherence tomography using random phase jumps on US and light [PDF]

, 2011
Acousto-Optical Coherence Tomography (AOCT) is variant of Acousto Optic Imaging (called also ultrasonic modulation imaging) that makes possible to get z resolution with acoustic and optic Continuous Wave (CW) beams.
A. C. Boccara, Atlan, Bossy, De Montmorillon, Delaye, Delaye, F. Ramaz, Farahi, Forget, Gross, Gross, Gross, Gross, Kempe, Lai, Le Clerc, Lesaffre, Lesaffre, Leutz, Lev, Lev, Leveque, Li, Li, Lévêque-Fort, M. Gross, M. Lesaffre, Murray, Ramaz, Rousseau, Rousseau, S. Farahi, Sui, Verpillat, Wang, Wang, Wang, Yao, Yao   +38 more
core   +5 more sources

Facilitating islet transplantation using a three-step approach with mesenchymal stem cells, encapsulation, and pulsed focused ultrasound

Stem Cell Research & Therapy, 2020
Background The aim of this study was to examine the effect of a three-step approach that utilizes the application of adipose tissue-derived mesenchymal stem cells (AD-MSCs), encapsulation, and pulsed focused ultrasound (pFUS) to help the engraftment and ...
Mehdi Razavi, Tanchen Ren, Fengyang Zheng, Arsenii Telichko, Jing Wang, Jeremy J. Dahl, Utkan Demirci, Avnesh S. Thakor   +7 more
doaj   +1 more source

Optical-resolution photoacoustic imaging through thick tissue with a thin capillary as a dual optical-in acoustic-out waveguide

, 2015
We demonstrate the ability to guide high-frequency photoacoustic waves through thick tissue with a water-filled silica-capillary (150 \mu m inner diameter and 30 mm long).
Bossy, Emmanuel, Gateau, Jerome, Huignard, Jean-Pierre, Moser, Christophe, Psaltis, Demetri, Simandoux, Olivier, Stasio, Nicolino   +6 more
core   +1 more source

Overcoming the acoustic diffraction limit in photoacoustic imaging by localization of flowing absorbers

, 2017
The resolution of photoacoustic imaging deep inside scattering media is limited by the acoustic diffraction limit. In this work, taking inspiration from super-resolution imaging techniques developed to beat the optical diffraction limit, we demonstrate ...
Arnal, Bastien, Bossy, Emmanuel, Vilov, Sergey   +2 more
core   +3 more sources

Acoustic radiation force impulse imaging for differentiation of thyroid nodules [PDF]

, 2012
Background: Acoustic Radiation Force Impulse (ARFI)-imaging is an ultrasound-based elastography method enabling quantitative measurement of tissue stiffness.
Berner, Christian, Bojunga, Jörg, Dauth, Nina, Friedrich-Rust, Mireen, Herrmann, Eva, Holzer, Katharina, Meyer, Gesine, Schroeter, Hartmut, Voelkl, Lisa, Zeuzem, Stefan   +9 more
core   +3 more sources