Synthetic Aperture Technique Applied to Tissue Attenuation Imaging

Klimonda, Ziemowit; Litniewski, Jerzy; Nowicki, Andrzej

doi:10.2478/v10168-011-0062-4

Cited by 3 publications

(3 citation statements)

References 12 publications

(6 reference statements)

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“…By applying their theory, it is possible to obtain the resonance-dependent phase velocity and sound damping factor in bubbly water medium at low frequencies. Despite the extensive applications of sound attenuation, not only in underwater sound propagation but also in the areas of biological studies like that reported by Klimonda [20], research on sound attenuation especially at low-frequency range has not been developed enough to fulfill the industrial and medical requirements. In underwater acoustics, almost all of the studies have concentrated on one or two effective parameters.…”

Section: Introductionmentioning

confidence: 99%

Sound attenuation in air–water media with rough bubbly interface at low frequencies considering bubble resonance dispersion

Bolghasi

Ghadimi

Chekab

2017

J Braz. Soc. Mech. Sci. Eng.

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The importance of incorporating the surface bubbles in acoustic modeling lies in the significant effects of the bubbly layer of the sea surface on the sound scattering, attenuation, and reflection. In the present paper, an acoustical system consisting of water, air, and bubbly water is considered and a particular approach incorporating a new version of the power-law concept for volumetric and scattering attenuation of bubbles is presented for the prediction of low-frequency damping of the sound in nearsurface propagation. Sound attenuation in this system is traced in four steps and each step is considered as an individual case. Through applying the new power-law attenuation, the corresponding damping coefficient is derived. It has been shown by comparing the obtained results with experimental data that, at lower frequencies, the present model has better agreement with experiments than the theoretical model. Furthermore, a parametric study is conducted on different volume fractions and surface roughness, from which the equivalent damping coefficient of the free surface region is extracted using a mechanical and acoustical analogy to model the sound attenuation due to impedance difference, rough interface, bubbly water, and propagation range. It has been demonstrated that the present model can be used as an effective simple method for predicting the attenuation of sound in bubbly media with different bubble sizes.

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Section: Introductionmentioning

confidence: 99%

Sound attenuation in air–water media with rough bubbly interface at low frequencies considering bubble resonance dispersion

Bolghasi

Ghadimi

Chekab

2017

J Braz. Soc. Mech. Sci. Eng.

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“…Singular Spectrum Analysis (SSA) is a relatively novel but powerful technique in time series analysis and forecasting that has been developed and applied to many practical problems (see, for example, [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] and references therein).…”

Section: Introductionmentioning

confidence: 99%

On the Separability Between Signal and Noise in Singular Spectrum Analysis

et al. 2012

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Communicated by Zoltan GinglThe optimal value of the window length in singular spectrum analysis (SSA) is considered with respect to the concept of separability between signal and noise component, from the theoretical and practical perspective. The theoretical results confirm that for a wide class of time series of length N , the suitable value of this parameter is median {1, . . . , N}. The results of both simulated and real data verify the effectiveness of the theoretical results. The theoretical results obtained here coincide with those obtained previously from the empirical point of view.

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“…The increase of the statistical independence of the image lines can be achieved through Synthetic Aperture Focusing Technique (SAFT) which, unlike the Classical Beamforming (CB), provides high image resolution in the whole scanned area. Some results of this approach can be found in our previous work (Klimonda et al, 2011). Another approach is to improve the attenuation estimates by means of compounding techniques.…”

Section: Introductionmentioning

confidence: 99%

Spatial and Frequency Compounding in Application to Attenuation Estimation in Tissue

Klimonda¹,

Litniewski²,

Karwat³

et al. 2015

Archives of Acoustics

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The soft tissue attenuation is an interesting parameter from medical point of view, because the value of attenuation coefficient is often related to the state of the tissue. Thus, the imaging of the attenuation coefficient distribution within the tissue could be a useful tool for ultrasonic medical diagnosis. The method of attenuation estimation based on tracking of the mean frequency changes in a backscattered signal is presented in this paper. The attenuation estimates are characterized by high variance due to stochastic character of the backscattered ultrasonic signal and some special methods must be added to data processing to improve the resulting images. The following paper presents the application of Spatial Compounding (SC), Frequency Compounding (FC) and the combination of both. The resulting parametric images are compared by means of root-mean-square errors. The results show that combined SC and FC techniques significantly improve the quality and accuracy of parametric images of attenuation distribution.

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Synthetic Aperture Technique Applied to Tissue Attenuation Imaging

Cited by 3 publications

References 12 publications

Sound attenuation in air–water media with rough bubbly interface at low frequencies considering bubble resonance dispersion

Sound attenuation in air–water media with rough bubbly interface at low frequencies considering bubble resonance dispersion

On the Separability Between Signal and Noise in Singular Spectrum Analysis

Spatial and Frequency Compounding in Application to Attenuation Estimation in Tissue

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