Measurement of Spatial Time-Of-Flight Fluctuations of Ultrasound Pulses Passing Through Inhomogeneous Layers

Krammer, P.; Hassler, Donald M.

doi:10.1109/ultsym.1987.199098

Cited by 20 publications

(5 citation statements)

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“…Although the multiple traps of the AV beam along the center axis can be generated by the main lobe and the side lobes in water, they are also influenced by the complex structure of the abdominal wall with obvious inhomogeneity. Through one-dimensional (1-D) fluctuation measurement of time delay for the abdominal wall, Krammer [25] observed that the arrival time of the wave front was different from each other with random individual difference. The time delay followed the statistic law [26] with a correlation length of 2-10 mm.…”

Section: Principle and Methodsmentioning

confidence: 99%

Random phase screen influence of the inhomogeneous tissue layer on the generation of acoustic vortices

Dong

et al. 2018

Chinese Phys. B

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The influence of the inhomogeneous tissue layer on the generation of acoustic vortices (AV) is studied theoretically and experimentally based on the phase screen model. By considering the time-shift of a random phase screen, the formula of acoustic pressure for the AV beam generated by a circular array of eight planar piston sources is derived. With the actual correlation length of the abdominal wall, numerical simulations before and after the insertion of the inhomogeneous tissue layer are conducted, and also demonstrated by experimental measurements. It is proved that, when the thickness variation of the phase screen is less than one wavelength, no significant influence on the generation of AVs can be produced. The variations of vortex nodes and antinodes in terms of the location, shape, and size of AVs are not obvious. Although the circular pressure distribution might be deformed by the phase interference with a larger thickness variation, AVs can still be generated around the center axis with perfect phase spirals in a reduced effective radius. The favorable results provide the feasibility of AV generation inside the human body and suggest the application potential of AVs in object manipulation for biomedical engineering.

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Section: Principle and Methodsmentioning

confidence: 99%

Random phase screen influence of the inhomogeneous tissue layer on the generation of acoustic vortices

Dong

et al. 2018

Chinese Phys. B

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“…Efforts to measure and correct aberration and its effects on image quality began appearing in the 1980’s [16] , [17] , [18] , [19] , [20] , [21] , [15] . These initial measurement techniques were primarily concerned with measuring the phase or time delays imposed by sound speed errors, and thus referred to these errors as phase aberrations.…”

Section: Sampling Of Aberrationmentioning

confidence: 99%

Aberration correction in diagnostic ultrasound: A review of the prior field and current directions

Ali

Brevett

Zhuang

et al. 2023

Zeitschrift für Medizinische Physik

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“…measured phase aberrations across the breasts of 7 patients using a 4.3 MHz matrix array, and measured azimuth steering error to be 0.8° ± 0.7° [47]. Kramer and Hassler found in vitro that normal livers introduced minor phase distortions while the abdominal wall introduced time-of-flight differences of up to 1 µsec across 20 mm of tissue [48]. …”

Section: Analysis Of Errorsmentioning

confidence: 99%

On System-Dependent Sources of Uncertainty and Bias in Ultrasonic Quantitative Shear-Wave Imaging

Deng

Rouze

Palmeri

et al. 2016

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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Ultrasonic quantitative shear wave imaging methods have been developed over the last decade to estimate tissue elasticity by measuring the speed of propagating shear waves following acoustic radiation force excitation. This work discusses eight sources of uncertainty and bias arising from ultrasound system dependent parameters in ultrasound shear wave speed (SWS) measurements. Each of the eight sources of error are discussed in the context of a linear, isotropic, elastic, homogeneous medium, combining previously reported analyses with Field II simulations, full-wave 2D acoustic propagation simulations and experimental studies. Errors arising from both spatial and temporal sources lead to errors in SWS measurements. Arrival time estimation noise, speckle bias, hardware fluctuations, and phase aberration cause uncertainties (variance) in SWS measurements, while pulse repetition frequency and beamforming errors, as well as coupling medium sound speed mismatch, cause biases in SWS measurements (accuracy errors). Calibration of the sources of bias is an important step in the development of shear wave imaging systems. In a well-calibrated system, where the sources of bias are minimized, and averaging over an ROI is employed to reduce the sources of uncertainty, a SWS error < 3% can be expected.

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Measurement of Spatial Time-Of-Flight Fluctuations of Ultrasound Pulses Passing Through Inhomogeneous Layers

Cited by 20 publications

References 0 publications

Random phase screen influence of the inhomogeneous tissue layer on the generation of acoustic vortices

Random phase screen influence of the inhomogeneous tissue layer on the generation of acoustic vortices

Aberration correction in diagnostic ultrasound: A review of the prior field and current directions

On System-Dependent Sources of Uncertainty and Bias in Ultrasonic Quantitative Shear-Wave Imaging

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