Journal ArticleDOI
Accurate Estimation of Scattering Strength Distribution by Simultaneous Reception of Ultrasonic Echoes with Multichannel Transducer Array
TLDR
In this article, the truncated singular value decomposition (tSVD) was applied to the echo signals from two wire targets simultaneously received with a multichannel transducer array.Abstract:
Recently, there have been several studies on ultrasonic cross-sectional imaging based on simultaneous reception of echo signals with an array transducer without scanning ultrasonic beams during transmission. In those studies, parallel processing was applied to create an image from a data set simultaneously received by the array. However, the lateral resolution of the parallel processing is not high. In this study, in order to improve the spatial resolution of parallel processing, the least-squares estimation and the truncated singular value decomposition (tSVD) are applied to the echo signals from two wire targets simultaneously received with a multichannel transducer array. We introduced a weighting for correcting the effect of the directivity of the elements of the array. The experimental results show a higher lateral resolution of the tSVD method with weighting than that of conventional parallel processing. The axial resolution is also improved by considering the finite duration of the transmitted ultrasonic pulse. A typical application of this method is nondestructive evaluation, that is, the detection of cavities and cracks in welded metal structures.read more
Citations
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Journal ArticleDOI
High Range Resolution Ultrasonographic Vascular Imaging Using Frequency Domain Interferometry With the Capon Method
Hirofumi Taki,Kousuke Taki,Takuya Sakamoto,Makoto Yamakawa,Tsuyoshi Shiina,Motoi Kudo,Toru Sato +6 more
TL;DR: The findings indicate the potential of the proposed method for the improvement of range resolution in ultrasonography without deterioration in temporal resolution, resulting in enhanced detection of vessel stenosis.
Journal ArticleDOI
Numerical Simulation of Acoustic Imaging Using a Combination of Finite Difference Time Domain and Boundary Integral Equation Methods
Takao Tsuchiya,Atsushi Kumagai +1 more
TL;DR: In this paper, a numerical method based on the combination of the finite difference time domain (FDTD) and boundary integral equation (BIE) methods is proposed and applied to the simulation of acoustic imaging.
Journal ArticleDOI
Introduction of measurement techniques in ultrasonic electronics: Basic principles and recent trends
Journal ArticleDOI
Aberration Correction with Low-Frequency Transmission for Medical Acoustic Imaging
Hirofumi Taki,Toru Sato +1 more
TL;DR: In this paper, the authors employed a focused transmit beam with a low center frequency for the calculation of an aberration correction value set, which was applied to an imaging process utilizing high-frequency transmission.
References
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Book
Wave propagation and scattering in random media
TL;DR: This IEEE Classic Reissue presents a unified introduction to the fundamental theories and applications of wave propagation and scattering in random media and is expressly designed for engineers and scientists who have an interest in optical, microwave, or acoustic wave propagate and scattering.
Journal ArticleDOI
Synthetic aperture imaging for small scale systems
TL;DR: Multi-element synthetic aperture imaging methods suitable for applications with severe cost and size limitations are explored in this article, where each method uses different spatial frequencies and acquisition strategies for imaging, and therefore different sets of active transmit/receive element combinations.
Journal ArticleDOI
High-speed ultrasound volumetric imaging system. II. Parallel processing and image display
TL;DR: The design, application, and evaluation of parallel processing to the high-speed volumetric ultrasound imaging system, which uses pulse-echo phased array principles to steer a 2-D array transducer of 289 elements in a pyramidal scan format is described.
Journal ArticleDOI
Ultrafast compound imaging for 2-D motion vector estimation: application to transient elastography
TL;DR: A new technique for two-dimensional imaging of the motion vector at a very high frame rate with ultrasound that allows us to follow both axial and lateral displacements during the shear wave propagation and thus should improve Young's modulus image reconstruction.
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