Results 31 to 40 of about 88,929 (292)
Effects of Non-Elevation-Focalized Linear Array Transducer on Ultrasound Plane-Wave Imaging
Sensors, 2016 Plane-wave ultrasound imaging (PWUS) has become an important method of ultrasound imaging in recent years as its frame rate has exceeded 10,000 frames per second, allowing ultrasound to be used for two-dimensional shear wave detection and functional ...
Congzhi Wang +4 more
doaj +1 more source
Binary acoustic metasurfaces for dynamic focusing of transcranial ultrasound
Frontiers in Neuroscience, 2022 Transcranial focused ultrasound (tFUS) is a promising technique for non-invasive and spatially targeted neuromodulation and treatment of brain diseases.
Zhongtao Hu +5 more
doaj +1 more source
A new directional acoustic lens: V-groove lens [PDF]
1993 Proceedings IEEE Ultrasonics Symposium, 1993 A new directional acoustic lens is introduced. The geometry is very similar to the line-focus lens except the lens cavity, which is shaped as a groove with flat-bottom V cross section. The slanted planar edges of the groove are inclined in order to generate waves incident on the object surface at a critical angle.
Bozkurt, Ayhan +3 more
openaire +2 more sources
Ultrahigh Frequency Ultrasonic Transducers (150MHz) Based on Silicon Lenses
Micromachines, 2023 Acoustic microscopes and acoustic tweezers have great value in the application of microparticle manipulation, biomedical research and non-destructive testing.
Jun Chen +6 more
doaj +1 more source
Sonic Gradient Index Lens for Aqueous Applications
, 2010 We study the acoustic scattering properties of a phononic crystal designed to behave as a gradient index lens in water, both experimentally and theoretically.
Cai, Liang-Wu +5 more
core +1 more source
Transformation seismology: composite soil lenses for steering surface elastic Rayleigh waves. [PDF]
, 2016 Metamaterials are artificially structured media that exibit properties beyond those usually encountered in nature. Typically they are developed for electromagnetic waves at millimetric down to nanometric scales, or for acoustics, at centimeter scales. By
Colombi, A +3 more
core +2 more sources
A Lamb wave lens for acoustic microscopy [PDF]
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 1992 In a conventional scanning acoustic microscope the excited leaky modes contribute significantly to the high contrast obtained in the images. However, all such modes exist simultaneously, and the interpretation of the images is not straightforward, especially in layered media.
Atalar, A., Koymen H., Degertekin F.L.
openaire +4 more sources
M-Bonacci Zone Plates for Ultrasound Focusing
Sensors, 2019 In this work, we present a thorough analysis on M-bonacci zone plates for ultrasound focusing applications. These planar lenses are capable of providing bifocal focusing profiles with equal intensity in both foci and become very appealing for a wide ...
Sergio Pérez-López +2 more
doaj +1 more source
Analysis of Predistortion Techniques on Fresnel Zone Plates in Ultrasound Applications
Sensors, 2021 In this work, we analyze the effect of predistortion techniques on the focusing profile of Fresnel Zone Plates (FZPs) in ultrasound applications. This novel predistortion method is based on either increasing or decreasing the width of some of the FZP ...
José Miguel Fuster +3 more
doaj +1 more source
Acoustic Forceps Based on Focused Acoustic Vortices with Different Topological Charges
Sensors, 2023 For enhanced energy concentration with improved flexibility for object manipulation, a focused acoustic vortex (FAV) is designed using a sector planar piston transducer array and acoustic lens that can produce the effective concentration of the acoustic ...
Libin Du +3 more
doaj +1 more source