NDLI: Optimal sound speed estimation using modified nonlinear anisotropic diffusion to improve spatial resolution in ultrasound imaging

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Low-frequency meandering piezoelectric vibration energy harvester

Self-amplified magnetoelectric properties in a dumbbell-shaped magnetostrictive/piezoelectric composite

Ferroelectrically active acoustic wave propagation

Performance analysis and receiver architectures of DCF77 radio-controlled clocks

Real-time ultrasound simulation using the GPU

Quantitative ultrasonic characterization of diffuse scatterers in the presence of structures that produce coherent echoes

Optimal sound speed estimation using modified nonlinear anisotropic diffusion to improve spatial resolution in ultrasound imaging

A reliability study of light refractive tomography utilized for noninvasive measurement of ultrasound pressure fields

Broadband generation of ultrasonic guided waves using piezoceramics and sub-band decomposition

Effect of roughness on imaging and sizing rough crack-like defects using ultrasonic arrays

Guided wave expansion in warped curvelet frames

Extracting the electromechanical coupling constant of piezoelectric thin film by the high-tone bulk acoustic resonator technique

Biological sensor based on a lateral electric field-excited resonator

Quantitative assessment on the orientation and distribution of carbon fibers in a conductive polymer composite using high-frequency ultrasound

A u-shaped linear ultrasonic motor using longitudinal vibration transducers with double feet

Theoretical modeling and equivalent electric circuit of a bimorph piezoelectric micromachined ultrasonic transducer

Investigations on AlN/sapphire piezoelectric bilayer structure for high-temperature SAW applications

Thickness-shear vibration of an AT-cut quartz resonator with a hyperbolic contour

Crystalline quality of the trigonal piezoelectric materials and effects of the extended defects

Numerical modeling of piezoelectric transducers using physical parameters

Design and performance testing of an ultrasonic linear motor with dual piezoelectric actuators

Electrode-shaping for the excitation and detection of permitted arbitrary modes in arbitrary geometries in piezoelectric resonators

Orthogonal quadratic chirp signals for simultaneous multi-zone focusing in medical ultrasound imaging

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Optimal sound speed estimation using modified nonlinear anisotropic diffusion to improve spatial resolution in ultrasound imaging

Content Provider	IEEE Xplore Digital Library
Author	Changhan Yoon Haijin Seo Yuhwa Lee Yangmo Yoo Tai-Kyong Song Jin Ho Chang
Copyright Year	1986
Abstract	In ultrasound exams of obese patients and the breast, the spatial and contrast resolutions of ultrasound images are severely deteriorated when a constant sound speed corresponding to soft tissue is used in receive dynamic beamformation. This degradation is due to the defocusing of the ultrasound beam because of the disparity in sound speed between soft tissue and fatty layers. To minimize the degradation, this paper proposes a new method of estimating an optimal sound speed that can be used to achieve the best beamforming performance in a region of interest (ROI). The proposed method employs a new focusing quality factor (FQF) as an indicator of how well the focusing is conducted with a given sound speed. The FQF is closely associated with the degree of edge conspicuity, which can be obtained using the proposed modified nonlinear anisotropic diffusion (MNAD) technique. To calculate FQF, ultrasound images are formed with different sound speeds ranging from 1400 to 1600 m/s and, subsequently, the ROI is chosen. In the ROI, the degrees of edge conspicuity (i.e., FQF) are calculated. The sound speed can be considered an optimal one for the ROI if it is used to construct the image that provides the maximum FQF. The performances of the proposed method were evaluated through simulation and in vitro experiments with a tissue-mimicking phantom. The performance was also compared with that of the conventional image-based method employed in a commercial ultrasound imaging system. The experimental results demonstrated that the proposed method is capable of estimating an optimal sound speed with an error of 10 m/s regardless of whether strong targets are included in the ROI or not. On the other hand, the conventional image-based method generated an estimation error of 60 m/s maximally in the case in which there were no strong targets in ROI. This indicates that the proposed method is a useful tool to improve ultrasound image quality for clinical applications, especially for ultrasound exams of obese patients and the breast.
File Size	1235848
File Format	PDF
ISSN	08853010
Volume Number	59
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-05-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Ultrasonic imaging Image edge detection Speckle Imaging Spatial resolution Radio frequency Anisotropic magnetoresistance
Content Type	Text
Resource Type	Article
Subject	Acoustics and Ultrasonics Instrumentation Electrical and Electronic Engineering

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