S. Leeman

MEASURING CAVITATION AT 1.5MHz

M. Hedges, S. Leeman, P.W. Vaughan

Ultrasound, in the megahertz frequency range, is being used

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MEASUREMENT AND CALIBRATION OF TRANSDUCER FIELDS

Eduardo Tavares Costa, S. Leeman, P.D.I. RICHARDSON, D.A. Seggie

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Reflection and Scattering of Acoustical Waves from a Discontinuity in Absorption

Joie P. Jones, S. Leeman, Eric C. Nolan, D. Lee

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Visco-Elastic Models for Soft Tissues

S. Leeman, Joie P. Jones

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A New Approach for Calculating Wideband Fields

S. Leeman, Andrew J. Healey, J.P. Weight

ConclusionsThe Directivity Spectrum approach presented here provides a convenient and efficient method to simulate transient acoustic fields propagating in homogenous media. Simulation output directly provides spatial ‘snapshots’ of the acoustic field at particular time instants. Attenuation and velocity dispersion are easily incorporated. …

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A Generalized Inversion of Helmholtz Equation and Its Application to Acoustical Imaging

Joie P. Jones, S. Leeman

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Causality Revisited

S. Leeman, Joie P. Jones, Andrew J. Healey

Causality is strictly obeyed by real physical systems. Propagative causality, as defined here, is appropriate for sonic pulses, and imposes a finite upper limit on the signal velocity, which is non-dispersive even in dispersive media. Causality implies dispersion relations, but these do …

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Ultrasound speckle and equivalent scatterers

Ricardo Grossi Dantas, Eduardo Tavares Costa, S. Leeman

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Basic Acoustic Theory

S. Leeman

This chapter contains sections titled: Introduction The Canonical Inhomogeneous Wave Equation of Linear Acoustics Acoustic Wave Variables Some Special Solutions Green's Function and Rayleigh's Integral Transducer Fields Propagation Across Planar Boundaries Finite Amplitude Waves References

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Split Phase Processing — a Single Image, Resolution Loss Free Method for Ultrasound Speckle Reduction

Ricardo Grossi Dantas, Eduardo Tavares Costa, S. Leeman, A.J. Healey et autres

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A New Approach to Diffraction Tomography

S. Leeman, Joie P. Jones

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Diffraction tomography with multiple scattering

S. Leeman, Joie P. Jones

A method for reconstructing the image of loss-less object from the measurement of its scattering amplitude is developed for the case of acoustic wave scattering from an inhomogeneous medium consisting of velocity fluctuations (Helmholtz equation). The inversion procedure is exact, and explicitly …

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