FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W2149138002> ?p ?o ?g. }

• W2149138002 abstract "This paper presents a technique for analyzing the acoustic fields generated by ultrasonic transmitters when radiating into layered, inhomogeneous media. The technique is based on the angular spectrum method of wavefield analysis, which is used to forward- or backpropagate acoustic fields between two parallel planar surfaces. Wave propagation is modelled as shift invariant filtering in the spatial frequency domain, with each spatial frequency component multiplied by the appropriate phase propagation factor. By modifying the phase propagation factors, the effects of attenuation, dispersion, refraction, and phase distortion may be modelled. Simulation results demonstrate several features of this approach, and experimental results show the ability of the technique to determine the pressure and velocity fields from different transducers. Wideband propagation is considered as an extension to the basic monochromatic model. 1 .O INTRODUCTION The design of ultrasonic imaging transducers has evolved over the last thirty-five years [l] to the point that there are standard design approaches employed to produce a transducer with specified imaging properties [2]. These imaging properties are typically stated in terms of resolution in a homogeneous medium such as water. Unfortunately, tissue is not homogeneous, and the resolving power of the transducer is affected by the attenuation, refraction, and phase distortion present in tissue. The goal of our work has been to develop a prediction technique which could simultaneously account for several of these tissue propagation properties. In addition, the technique was to be flexible, computationally efficient, and suitable for the analysis of practical transducer geometries, including phased linear arrays. This latter requirement stemmed from recent results [3,4], which note that the inhomogeneous nature of tissue is the limiting factor in the development of higher resolution diagnostic ultrasound equipment. These requirements formed the basis for the approach which was taken. The technique was based on the angular spectrum, or Fourier decomposition method [5], which is one of the more powerful techniques for predicting acoustic field distributions in homogeneous media. The angular spectrum method decomposes the pressure distribution over a plane surface into a two-dimensional spectrum of plane waves. Propagation is then modelled by multiplying each Fourier spectral component by the appropriate phase factor, effectively performing a linear filtering operation. The advantages of this technique include: high computational efficiency using the FFT algorithm, high spatial resolution even in the nearfield of the acoustic source, and the ability to predict acoustic fields over an entire plane in a single two-dimensional FFT operation. The method has been used to analyze transducer performance [6], to predict transducer beam patterns [7], and to image scattering objects [a], all in homogeneous media. For completeness, the basic derivation of the angular spectrum method is presented in Section 2. One of the underlying assumptions in the development of the angular spectrum method is that the medium is" @default.
• W2149138002 created "2016-06-24" @default.
• W2149138002 creator A5012173511 @default.
• W2149138002 creator A5034228030 @default.
• W2149138002 creator A5076245125 @default.
• W2149138002 date "1987-01-01" @default.
• W2149138002 modified "2023-10-11" @default.
• W2149138002 title "Propagation Through Inhomogeneous Media Using the Angular Spectrum Method" @default.
• W2149138002 cites W1978692232 @default.
• W2149138002 cites W1990130510 @default.
• W2149138002 cites W2001783416 @default.
• W2149138002 cites W2033201667 @default.
• W2149138002 cites W2045553135 @default.
• W2149138002 cites W2072408233 @default.
• W2149138002 cites W2087177965 @default.
• W2149138002 cites W2094576776 @default.
• W2149138002 cites W2142085558 @default.
• W2149138002 cites W2151257620 @default.
• W2149138002 cites W2332290 @default.
• W2149138002 cites W266335917 @default.
• W2149138002 cites W45983348 @default.
• W2149138002 doi "https://doi.org/10.1109/ultsym.1987.199099" @default.
• W2149138002 hasPublicationYear "1987" @default.
• W2149138002 type Work @default.
• W2149138002 sameAs 2149138002 @default.
• W2149138002 citedByCount "10" @default.
• W2149138002 crossrefType "proceedings-article" @default.
• W2149138002 hasAuthorship W2149138002A5012173511 @default.
• W2149138002 hasAuthorship W2149138002A5034228030 @default.
• W2149138002 hasAuthorship W2149138002A5076245125 @default.
• W2149138002 hasConcept C120665830 @default.
• W2149138002 hasConcept C121332964 @default.
• W2149138002 hasConcept C128975484 @default.
• W2149138002 hasConcept C156778621 @default.
• W2149138002 hasConcept C207114421 @default.
• W2149138002 hasConcept C41008148 @default.
• W2149138002 hasConcept C62520636 @default.
• W2149138002 hasConceptScore W2149138002C120665830 @default.
• W2149138002 hasConceptScore W2149138002C121332964 @default.
• W2149138002 hasConceptScore W2149138002C128975484 @default.
• W2149138002 hasConceptScore W2149138002C156778621 @default.
• W2149138002 hasConceptScore W2149138002C207114421 @default.
• W2149138002 hasConceptScore W2149138002C41008148 @default.
• W2149138002 hasConceptScore W2149138002C62520636 @default.
• W2149138002 hasLocation W21491380021 @default.
• W2149138002 hasOpenAccess W2149138002 @default.
• W2149138002 hasPrimaryLocation W21491380021 @default.
• W2149138002 hasRelatedWork W2012337963 @default.
• W2149138002 hasRelatedWork W2019775569 @default.
• W2149138002 hasRelatedWork W2034608350 @default.
• W2149138002 hasRelatedWork W2064124173 @default.
• W2149138002 hasRelatedWork W2072793458 @default.
• W2149138002 hasRelatedWork W2076447567 @default.
• W2149138002 hasRelatedWork W2810129415 @default.
• W2149138002 hasRelatedWork W2966352287 @default.
• W2149138002 hasRelatedWork W4250437287 @default.
• W2149138002 hasRelatedWork W2101189720 @default.
• W2149138002 isParatext "false" @default.
• W2149138002 isRetracted "false" @default.
• W2149138002 magId "2149138002" @default.
• W2149138002 workType "article" @default.