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IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

Issue 9 • Date Sept. 2004

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Displaying Results 1 - 23 of 23
  • IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

    Publication Year: 2004, Page(s):1 - 2
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  • IEEE Ultrasonics, Ferroelectrics, and Frequency Control Society

    Publication Year: 2004, Page(s): 3
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  • IEEE Ultrasonics, Ferroelectrics, and Frequency Control Society

    Publication Year: 2004, Page(s): 4
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  • Table of contents

    Publication Year: 2004, Page(s):5 - 6
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  • Information for contributors with multimedia addition

    Publication Year: 2004, Page(s):1041 - 1045
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  • A multimedia example

    Publication Year: 2004, Page(s): 1046
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  • Effects of piezoelectric coupling on energy mapping of thickness-shear modes

    Publication Year: 2004, Page(s):1047 - 1049
    Cited by:  Papers (18)
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  • AMCXO and its test system

    Publication Year: 2004, Page(s):1050 - 1053
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (314 KB) | HTML iconHTML

    In this paper, we introduce a novel temperature compensated crystal oscillator - analog memory compensated crystal oscillator (AMCXO), a microcomputer compensated crystal oscillator (MCXO) based on an analogue approach, and we compare the performance between MCXO and AMCXO, arid analyze the necessity of developing AMCXO. Both AMCXO and MCXO, combined with their test systems, use computers to gener... View full abstract»

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  • Spherical Bragg reflector resonators

    Publication Year: 2004, Page(s):1054 - 1059
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (963 KB) | HTML iconHTML

    In this paper we introduce the concept of the spherical Bragg reflector (SBR) resonator. The resonator is made from multiple layers of spherical dielectric, loaded within a spherical cavity. The resonator is designed to concentrate the energy within the central region of the resonator and away from the cavity walls to minimize conductor losses. A set of simultaneous equations is derived, which all... View full abstract»

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  • Modeling of wave propagation in layered piezoelectric media by a recursive asymptotic method

    Publication Year: 2004, Page(s):1060 - 1071
    Cited by:  Papers (27)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (711 KB) | HTML iconHTML

    In this paper, a simple asymptotic method to compute wave propagation in a multilayered general anisotropic piezoelectric medium is discussed. The method is based on explicit second and higher order asymptotic representations of the transfer and stiffness matrices for a thin piezoelectric layer. Different orders of the asymptotic expansion are obtained using Pade approximation of the transfer matr... View full abstract»

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  • Experimental investigation of computed tomography sound velocity reconstruction using incomplete data

    Publication Year: 2004, Page(s):1072 - 1081
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2451 KB) | HTML iconHTML

    An approach for reconstructing the sound velocity distribution in the breast was previously proposed and verified by simulations, and the present study investigated the approach experimentally. The experimental setup comprised a 5-MHz, 128-channel linear array, a programmable digital array system, a phantom containing objects with differing physical properties, and a computer. The array system was... View full abstract»

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  • Direct sampled I/Q beamforming for compact and very low-cost ultrasound imaging

    Publication Year: 2004, Page(s):1082 - 1094
    Cited by:  Papers (33)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1400 KB) | HTML iconHTML

    A wide variety of beamforming approaches are applied in modern ultrasound scanners, ranging from optimal time domain beamforming strategies at one end to rudimentary narrowband schemes at the other. Although significant research has been devoted to improving image quality, usually at the expense of beamformer complexity, we are interested in investigating strategies that sacrifice some image quali... View full abstract»

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  • Sound speed estimation using automatic ultrasound image registration

    Publication Year: 2004, Page(s):1095 - 1106
    Cited by:  Papers (18)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (685 KB) | HTML iconHTML

    A mismatch between the sound speed assumed for beamforming and scan conversion and the true sound speed in the tissue to be imaged can lead to significant defocusing and some geometric distortions in ultrasound images. A method is presented for estimating the average sound speed based on detection of these distortions using automatic registration of overlapping, electronically steered images. An a... View full abstract»

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  • Directional synthetic aperture flow imaging

    Publication Year: 2004, Page(s):1107 - 1118
    Cited by:  Papers (34)  |  Patents (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3053 KB) | HTML iconHTML

    A method for flow estimation using synthetic aperture imaging and focusing along the flow direction is presented. The method can find the correct velocity magnitude For any flow angle, and full color flow images can be measured using only 32 to 128 pulse emissions. The approach uses spherical wave emissions with a number of defocused elements and a linear frequency-modulated pulse (chirp) to impro... View full abstract»

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  • Axial strain calculation using a low-pass digital differentiator in ultrasound elastography

    Publication Year: 2004, Page(s):1119 - 1127
    Cited by:  Papers (58)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3610 KB) | HTML iconHTML

    In ultrasound elastography, tissue axial strains are calculated from the gradient of the estimated axial displacements. However, the common differentiation operation amplifies the noises in the displacement estimation, especially at high frequencies. In this paper, a low-pass digital differentiator (LPDD) is proposed to calculate the axial strain from the estimated tissue displacement. Several LPD... View full abstract»

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  • Estimation of surface pose with a physically-based ultrasonic image model

    Publication Year: 2004, Page(s):1128 - 1136
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (698 KB) | HTML iconHTML Multimedia Media

    State-of-the-art approaches to shape analysis in medical images use a variety of sophisticated models for object shape. We have developed an image model that permits the application of these approaches to ultrasonic images, with detailed methods for representing rough surfaces. Our physically-based, probabilistic image model incorporates the combined effects of the system point-spread function (PS... View full abstract»

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  • Contrast echocardiography for pulmonary blood volume quantification

    Publication Year: 2004, Page(s):1137 - 1147
    Cited by:  Papers (24)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (548 KB) | HTML iconHTML

    Pulmonary blood volume quantification is important both for diagnosis and for monitoring of the circulatory system. It requires employment of transpulmonary indicator dilution techniques, which are very invasive due to the need for double catheterization. This paper presents a new minimally invasive technique for blood volume quantification. An ultrasound contrast agent bolus is injected periphera... View full abstract»

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  • The RF-powered surface wave sensor oscillator - a successful alternative to passive wireless sensing

    Publication Year: 2004, Page(s):1148 - 1156
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (963 KB) | HTML iconHTML

    A novel, passive wireless surface acoustic wave (SAW) sensor providing a highly coherent measurand proportional frequency, frequency modulated (FM) with identification (ID) data and immune to interference with multiple-path signals is described. The sensor is appropriate for bandwidth-limited applications requiring high-frequency accuracy. It comprises a low-power oscillator, stabilized with the s... View full abstract»

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  • Dyadic Green's functions of a laminar plate

    Publication Year: 2004, Page(s):1157 - 1164
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (438 KB) | HTML iconHTML

    We introduce the concept of dyadic Green's functions of a laminar plate. These functions generalize classical Green's functions. In addition to relating displacements and stresses at the surface of a medium, they relate these quantities at both the top and the bottom surfaces of a medium of finite thickness and infinite extent in the transverse directions. We describe here the calculation of these... View full abstract»

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  • Idealized analysis of SAW longitudinally coupled resonator filters

    Publication Year: 2004, Page(s):1165 - 1170
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (491 KB) | HTML iconHTML

    A surface acoustic wave (SAW) longitudinally coupled resonator (LCR) filter consists of either two or three interdigital transducers located between two strongly reflecting gratings. The behavior of this structure is, in general, very complex because the transducers are of the single-electrode type, which gives strong electrode reflections. It is shown here that, for the filter passband, a number ... View full abstract»

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  • A new-style, slotted-cymbal transducer with large displacement and high energy transmission

    Publication Year: 2004, Page(s):1171 - 1177
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1293 KB) | HTML iconHTML

    The cymbal transducer had more improved performances than the moonie transducer, but as with the moonie end caps, flexural motion of the cymbal end caps would cause high-tangential stresses, which could lead to loss of mechanical output energy. So, a new-style design, called slotted-cymbal transducer, is presented in this paper. The slotted-cymbal transducer released the tangential stresses by ado... View full abstract»

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  • Finite-element analysis of material and parameter effects in laser-based thermoelastic ultrasound generation

    Publication Year: 2004, Page(s):1178 - 1186
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1139 KB) | HTML iconHTML

    Laser-based, thermoelastic transduction methods have potential in very high frequency (>50 MHz), high-density two-dimensional (2-D) arrays for a variety of very high-resolution superficial imaging applications, including in vivo tissue sectioning. Previous studies of these transducers generally have been based on experimental measurements or theoretical analyses using various simplifying assumptio... View full abstract»

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  • Time-scale removal of "wall thump" in Doppler ultrasound signals: a simulation study

    Publication Year: 2004, Page(s):1187 - 1192
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (767 KB) | HTML iconHTML

    A novel approach for blood and wall signal separation in Doppler ultrasound is proposed in the wavelet time-scale domain. The Doppler signals of different clutter-to-blood ratios from a femoral artery were simulated and used in the experiments. Compared with the conventional high-pass filtering and the signal separation in the spectrogram, the new method delivers improved performance for "wall thu... View full abstract»

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Aims & Scope

IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control focuses on the theory, design, and application on generation, transmission, and detection of bulk and surface mechanical waves.

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Meet Our Editors

Editor-in-Chief
Steven Freear
s.freear@leeds.ac.uk