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Journal articles on the topic 'Ultrasonic imaging – Data processing'

Author: Grafiati

Published: 4 June 2021

Last updated: 9 February 2022

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1

Krieg, F., J. Kirchhof, S. Kodera, et al. "SAFT processing for manually acquired ultrasonic measurement data with 3D smartInspect." Insight - Non-Destructive Testing and Condition Monitoring 61, no. 11 (2019): 663–69. http://dx.doi.org/10.1784/insi.2019.61.11.663.

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The architecture and implementation of a system for synthetic aperture focusing technique (SAFT) reconstruction on ultrasonic data acquired using a hand-held device is described. The reconstruction and the measurement process are performed simultaneously, with the goal of providing instantaneous highly focused visual feedback to the engineer. The implementation is based on the 3D smartInspect system that is currently being developed at Fraunhofer Institute for Nondestructive Testing IZFP. This system assists engineers by recording, displaying and protocolling manually acquired data. In this pa

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Mayer, Klaus, Karl-Jörg Langenberg, Martin Krause, Boris Milmann, and Frank Mielentz. "Characterization of Reflector Types by Phase-Sensitive Ultrasonic Data Processing and Imaging." Journal of Nondestructive Evaluation 27, no. 1-3 (2008): 35–45. http://dx.doi.org/10.1007/s10921-008-0035-3.

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3

Gao, Xiao Ming. "The Implement of B-Ultrasonic Image Acquisition Based on Camera Interface." Applied Mechanics and Materials 513-517 (February 2014): 3801–4. http://dx.doi.org/10.4028/www.scientific.net/amm.513-517.3801.

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B-ultrasonic is widely used in medical diagnostics and other fields, because of its non-invasive, no radiation, etc. Early B-ultrasonic with analog imaging system cant achieve B-ultrasonic image processing, data storage and other operations. With the development of computer technology and electronic technology, Digital B-ultrasonic systems are increasingly used in actual diagnosis, the paper through the use of digital imaging system to achieve B-ultrasonic front ultrasound imaging, reuse embedded microcontrollers Camera interface for B-ultrasonic acquisition of image data, and on this platform

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4

Gehlbach, Steve M., and F. Graham Sommer. "Frequency Diversity Speckle Processing." Ultrasonic Imaging 9, no. 2 (1987): 92–105. http://dx.doi.org/10.1177/016173468700900202.

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Ultrasonic waveform data from a tissue-mimicking phantom containing low contrast targets was digitized, stored and processed prior to creating and displaying ultrasonic images. Speckle reduction was performed by digital filtering of the waveform data with appropriately spaced and weighted digital filters, prior to both coherent and incoherent image averaging. The resultant images showed increased signal-to-noise ratios, consistent with theory. Better definition of low contrast target boundaries was noted in the processed, compared to unprocessed, images. Incoherent and coherent processing were

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Hoyle, C., M. Sutcliffe, P. Charlton, S. Mosey, and I. Cooper. "Limited-angle ultrasonic tomography back-projection imaging." Insight - Non-Destructive Testing and Condition Monitoring 63, no. 1 (2021): 20–28. http://dx.doi.org/10.1784/insi.2021.63.1.20.

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Ultrasonic inspection of through-transmission is limited due to the inability to obtain defect depth information. Loss of signal is used as the only indicator, providing lateral defect information. This is often a problem in ultrasonic inspection. Radiographic acquisition techniques, where the X-ray source acts as the transmitter and the detector as the receiver, are conceptionally similar to ultrasonic through-transmission. In the latter, the tomography back-projection method is used to reconstruct images of an object that has been subjected to a minimum of 180° of rotation, to allow for full

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Deng, Yufeng, Ned C. Rouze, Mark L. Palmeri, and Kathryn R. Nightingale. "Ultrasonic Shear Wave Elasticity Imaging Sequencing and Data Processing Using a Verasonics Research Scanner." IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control 64, no. 1 (2017): 164–76. http://dx.doi.org/10.1109/tuffc.2016.2614944.

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Naik, H. Rama Murthy, J. Jerald, and N. Rajesh Mathivanan. "Impact Damage Detection in GFRP Laminates through Ultrasonic Imaging." Advanced Materials Research 585 (November 2012): 337–41. http://dx.doi.org/10.4028/www.scientific.net/amr.585.337.

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Composite materials are increasingly used in aerospace, naval and automotive vehicles due to their high specific strength and stiffness. In the area of Non destructive testing, ultrasonic C-scans are used frequently to detect defects in composite components caused during fabrication and damage resulting from service conditions. Ultrasonic testing uses transmission of high frequency sound waves into a material to detect imperfections or to locate changes in material properties. The most commonly used ultrasonic testing technique is pulse echo and through transmission wherein sound is introduced

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Ma, Hong Wei, Ming Dong, Yuan Chen, and Qing Hua Mao. "Development of Ultrasonic Automatic Testing System for Flaws of Rotary Parts." Applied Mechanics and Materials 128-129 (October 2011): 575–79. http://dx.doi.org/10.4028/www.scientific.net/amm.128-129.575.

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In order to conquer the disadvantages of undetection, misjudgment and low-efficiency in ultrasonic A-scan testing for rotary parts, an ultrasonic automatic imaging system was developed, and automatic scan device was specially designed for rotary parts. Moreover, the testing software was programmed by LabWindows/CVI, which achieves the acquisition and processing of ultrasonic signals, and displays A, B, C, D and P-scan image. On the basis of storing A-scan data and transforming non-isotropic resolution B-scan image into isotropic one, P-scan imaging is realized. Medium filtering was applied to

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Müller, Sabine, Ernst Niederleithinger, and Thomas Bohlen. "Reverse Time Migration: A Seismic Imaging Technique Applied to Synthetic Ultrasonic Data." International Journal of Geophysics 2012 (2012): 1–7. http://dx.doi.org/10.1155/2012/128465.

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Ultrasonic echo testing is a more and more frequently used technique in civil engineering to investigate concrete building elements, to measure thickness as well as to locate and characterise built-in components or inhomogeneities. Currently the Synthetic Aperture Focusing Technique (SAFT), which is closely related to Kirchhoff migration, is used in most cases for imaging. However, this method is known to have difficulties to image steeply dipping interfaces as well as lower boundaries of tubes, voids or similar objects. We have transferred a processing technique from geophysics, the Reverse T

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Liang, Haidong-Dong, Chun Sing Louis Tsui, Michael Halliwell, and Peter N. T. Wells. "Continuous wave ultrasonic Doppler tomography." Interface Focus 1, no. 4 (2011): 665–72. http://dx.doi.org/10.1098/rsfs.2011.0018.

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In continuous wave ultrasonic Doppler tomography (DT), the ultrasonic beam moves relative to the scanned object to acquire Doppler-shifted frequency spectra which correspond to cross-range projections of the scattering and reflecting structures within the object. The relative motion can be circular or linear. These data are then backprojected to reconstruct the two-dimensional image of the object cross section. By using coherent processing, the spatial resolution of ultrasonic DT is close to an order of magnitude better than that of traditional pulse-echo imaging at the same ultrasound frequen

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Tran, Dai Quoc, Ju-Won Kim, Kassahun Demissie Tola, Wonkyu Kim, and Seunghee Park. "Artificial Intelligence-Based Bolt Loosening Diagnosis Using Deep Learning Algorithms for Laser Ultrasonic Wave Propagation Data." Sensors 20, no. 18 (2020): 5329. http://dx.doi.org/10.3390/s20185329.

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The application of deep learning (DL) algorithms to non-destructive evaluation (NDE) is now becoming one of the most attractive topics in this field. As a contribution to such research, this study aims to investigate the application of DL algorithms for detecting and estimating the looseness in bolted joints using a laser ultrasonic technique. This research was conducted based on a hypothesis regarding the relationship between the true contact area of the bolt head-plate and the guided wave energy lost while the ultrasonic waves pass through it. First, a Q-switched Nd:YAG pulsed laser and an a

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Ye, Jiaxing, Shunya Ito, and Nobuyuki Toyama. "Computerized Ultrasonic Imaging Inspection: From Shallow to Deep Learning." Sensors 18, no. 11 (2018): 3820. http://dx.doi.org/10.3390/s18113820.

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For many decades, ultrasonic imaging inspection has been adopted as a principal method to detect multiple defects, e.g., void and corrosion. However, the data interpretation relies on an inspector’s subjective judgment, thus making the results vulnerable to human error. Nowadays, advanced computer vision techniques reveal new perspectives on the high-level visual understanding of universal tasks. This research aims to develop an efficient automatic ultrasonic image analysis system for nondestructive testing (NDT) using the latest visual information processing technique. To this end, we first e

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Wang, Chuangnan, Thomas Connolley, Iakovos Tzanakis, Dmitry Eskin, and Jiawei Mi. "Characterization of Ultrasonic Bubble Clouds in A Liquid Metal by Synchrotron X-ray High Speed Imaging and Statistical Analysis." Materials 13, no. 1 (2019): 44. http://dx.doi.org/10.3390/ma13010044.

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Quantitative understanding of the interactions of ultrasonic waves with liquid and solidifying metals is essential for developing optimal processing strategies for ultrasound processing of metal alloys in the solidification processes. In this research, we used the synchrotron X-ray high-speed imaging facility at Beamline I12 of the Diamond Light Source, UK to study the dynamics of ultrasonic bubbles in a liquid Sn-30wt%Cu alloy. A new method based on the X-ray attenuation for a white X-ray beam was developed to extract quantitative information about the bubble clouds in the chaotic and quasi-s

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Nguyen, Luan T., and Erik H. Saenger. "Guided ultrasonic wavefield cross-correlation with a curved array for high-resolution plate inspection." Journal of Geophysics and Engineering 17, no. 3 (2020): 451–62. http://dx.doi.org/10.1093/jge/gxaa004.

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Abstract We present in this work an ultrasonic imaging technique based on wavefield cross-correlation that has potential for high-resolution inspecting of plates and plate-like structures. A curved transmit/receive array setup is used for acquiring wide-aperture waveform data beneficial for applying the presented imaging condition. An additional dispersion analysis using waveform data received by a linear array allows one to reveal the excited guided wave modes and possibly determine the shear wave velocity as an input parameter in the 3D wavefield simulation. Using synthetic but realistic dat

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15

Mohammadkhani, Reza, Luca Zanotti Fragonara, Janardhan Padiyar M., et al. "Improving Depth Resolution of Ultrasonic Phased Array Imaging to Inspect Aerospace Composite Structures." Sensors 20, no. 2 (2020): 559. http://dx.doi.org/10.3390/s20020559.

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In this paper, we present challenges and achievements in development and use of a compact ultrasonic Phased Array (PA) module with signal processing and imaging technology for autonomous non-destructive evaluation of composite aerospace structures. We analyse two different sets of ultrasonic scan data, acquired from 5 MHz and 10 MHz PA transducers. Although higher frequency transducers promise higher axial (depth) resolution in PA imaging, we face several signal processing challenges to detect defects in composite specimens at 10 MHz. One of the challenges is the presence of multiple echoes at

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16

Saidov, B. B., and V. F. Telezhkin. "OPTO-ULTRASONIC COMMUNICATION CHANNELS." Bulletin of the South Ural State University. Ser. Computer Technologies, Automatic Control & Radioelectronics 20, no. 4 (2020): 55–62. http://dx.doi.org/10.14529/ctcr200406.

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Ultrasound is widely used in various applications, such as monitoring the state of structures, biomed-ical ultrasound imaging, and information (data) transmission. Ultrasonic transceivers are one of the modern communication systems, both for short-range and remote access. Indeed, the technology of the process of transmitting information using communication channels based on ultrasonic (US) vi-brations and the physical implementation of transmission using optical fiber are widely used in con-ditions of confidentiality of data processing. At the same time, the needs of wireless and wired communi

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Anderson, Brian E. "Signal Processing: Data analysis, machine learning, and imaging sources." Journal of the Acoustical Society of America 146, no. 4 (2019): 2870. http://dx.doi.org/10.1121/1.5136960.

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Li, Qiu Feng, Hong Guang Liu, Hui Cong Ma, and Zhen Hua Chen. "Study on Improved Computed Tomography Algorithm in Concrete Structure." Applied Mechanics and Materials 189 (July 2012): 401–5. http://dx.doi.org/10.4028/www.scientific.net/amm.189.401.

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In ultrasonic CT of concrete structure, ray tracing technology based on SNELL principle is far more meet the characteristics of ultrasonic propagation. Inversion algorithm of tomography imaging is to solve large sparse equations. Simultaneous iterative reconstruction technique (SIRT) algorithm solves the problem from the mathematical view. According to engineering application, A improved imaging reconstruction method is proposed in the basis. During the data processing of simulation, the data weighting matrix is introduced to increase the proportion of effective information firstly; And then t

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19

Eyding, Jens, Christian Fung, Wolf-Dirk Niesen, and Christos Krogias. "Twenty Years of Cerebral Ultrasound Perfusion Imaging—Is the Best yet to Come?" Journal of Clinical Medicine 9, no. 3 (2020): 816. http://dx.doi.org/10.3390/jcm9030816.

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Over the past 20 years, ultrasonic cerebral perfusion imaging (UPI) has been introduced and validated applying different data acquisition and processing approaches. Clinical data were collected mainly in acute stroke patients. Some efforts were undertaken in order to compare different technical settings and validate results to gold standard perfusion imaging. This review illustrates the evolution of the method, explicating different technical aspects and milestones achieved over time. Up to date, advancements of ultrasound technology as well as data processing approaches enable semi-quantitati

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Guo, Xufei, Yan Han, and Pengfei Nie. "Ultrasound Imaging Algorithm: Half-Matrix Focusing Method Based on Reciprocity." Mathematical Problems in Engineering 2021 (February 2, 2021): 1–11. http://dx.doi.org/10.1155/2021/8888469.

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The ultrasonic phased array total focusing method (TFM) has the advantages of high imaging signal-to-noise ratio (SNR) and high defect resolution, but the problem of large amount data capturing and processing limits its practical industrial applications. To reduce the imaging calculation demand of the total focusing method, a half-matrix focusing method (HFM) is proposed based on the acoustic reciprocity. The method simplifies the calculation process of full-matrix data capturing (FMC) and total focus imaging. The experimental results show that the signal obtained by the linear array transceiv

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21

Herment, A., J. P. Guglielmi, P. Péronneau, and Ph Dumée. "High-Resolution, Reflection Mode Tomographic Imaging Part II: Application to Echography." Ultrasonic Imaging 11, no. 1 (1989): 22–41. http://dx.doi.org/10.1177/016173468901100102.

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Principles of high-resolution, ultrasonic imaging using data acquisition by a compound scanning with a sector echograph are presented. The signal processing is based on both deconvolution and reflection mode tomography. Three of the methods that can be derived from these principles are selected due to their lower computation costs. Applications of these methods to synthetic data and test targets demonstrate that, with respect to 2D deconvolution, they offer: a gain in computation time of more than 8, an improvement in resolution of the order of 10 and an increase of S/N ratio of the order of 4

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Ahmed, Hasan, and Jung-Ryul Lee. "Development of autonomous target recognition and scanning technology for pulse-echo ultrasonic propagation imager." Structural Health Monitoring 19, no. 4 (2019): 1064–74. http://dx.doi.org/10.1177/1475921719874823.

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This article proposes a pulse-echo ultrasonic propagation imaging system that is capable of autonomous target recognition and scanning an area of a customizable shape for the non-destructive evaluation of structural defects. The proposed system employs through-the-thickness bulk waves for ultrasonic inspection, which is achieved by joining two laser beams: one each for the ultrasonic wave generation and sensing. Moreover, the system is capable of autonomously suggesting a suitable inspection area for a specimen placed in front of the scanning head. The scan area delimitation algorithm uses the

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Yamamoto, Tokuo, and Howoong Shon. "Data processing for high‐resolution 3‐D subbottom imaging system ‘‘kite.’’." Journal of the Acoustical Society of America 91, no. 4 (1992): 2464. http://dx.doi.org/10.1121/1.403046.

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Sun, Hong Chun, Da Long Zhang, and Shao Kun Wu. "Overview of Ultrasound Imaging Algorithms Based on Synthetic Aperture Focusing Technique." Advanced Materials Research 712-715 (June 2013): 2051–54. http://dx.doi.org/10.4028/www.scientific.net/amr.712-715.2051.

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Synthetic aperture focusing ultrasound imaging technique used signal processing method to analysis ultrasonic echo data. It let the performance of transducer with small apertures be as well as the transducer with large aperture. It can still obtain high azimuth resolution image and form three-dimensional image, when it was operated at lower operating frequency. This paper describes the history and the theory of synthetic aperture focusing ultrasound imaging technology. It also contains the development of the synthetic aperture focusing ultrasound imaging technology in China and at abroad. And

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Durgadevi, P., and S. Vijayalakshmi. "Deep Survey and Comparative Analysis of Medical Image Processing." Journal of Computational and Theoretical Nanoscience 17, no. 5 (2020): 2321–29. http://dx.doi.org/10.1166/jctn.2020.8890.

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Biomedical picture handling has encountered emotional extension, and has been an interdisciplinary research field drawing in skill from connected arithmetic, PC sciences, building, insights, material science, science and medication. PC helped indicative handling has just turned into a critical piece of clinical daily schedule. Joined by a surge of new advancement of high innovation and utilization of different imaging modalities, more difficulties emerge; for instance, how to process and dissect a huge volume of pictures so top notch data can be delivered for sickness findings and treatment. T

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Rejani, Sofia, Abdellatif Khamlichi, and Abdellah El-Hajjaji. "Robustness of ultrasonic detection of flaws by using synthetic aperture focusing technique." MATEC Web of Conferences 191 (2018): 00012. http://dx.doi.org/10.1051/matecconf/201819100012.

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One of the challenging problems in non-destructive evaluation is related to identification and sizing of flaws. A high resolution image of the scanned part is required. This allows, through using adequate post-processing of data, to perform localisation and sizing of a flaw. Several techniques have been introduced recently for this purpose. These include among others the synthetic aperture focusing technique, inverse wave-field extrapolation and the total focusing method. However, large uncertainties are affecting the inverse problem solution as provided by these methods when dealing with smal

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Lifshitz, Ilan, Peder C. Pedersen, and Peter A. Lewin. "Reconstruction of the Acoustical Impedance Profile of a Multilayer Medium." Ultrasonic Imaging 14, no. 1 (1992): 40–68. http://dx.doi.org/10.1177/016173469201400104.

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The recovery of the acoustical reflectivity function and impedance profile of a layered medium from bandlimited and noisy pulse-echo ultrasonic data is considered. The effects of the transducer and the noise are reduced using Wiener filtering. With further signal processing and a priori knowledge of the attenuation and the velocity profiles, the compensated coefficients of the reflectivity function and the impedance profile are recovered. The reconstruction techniques are presented analytically, and are also evaluated in an experimental setup composed of a conventional pulse echo system, a dat

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Mai, Jerome J., Fermin A. Lupotti, and Michael F. Insana. "Vascular Elasticity from Regional Displacement Estimates." Ultrasonic Imaging 25, no. 3 (2003): 171–92. http://dx.doi.org/10.1177/016173460302500305.

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A recently-developed ultrasonic technique for measuring elastic properties of vascular tissue is evaluated using computer simulations, phantom and in vivo human measurements. A time sequence of displacement images is measured over the cardiac cycle to describe the spatial and temporal patterns of deformation surrounding arteries. This information is combined with a mathematical model to estimate an elastic modulus. Computer simulations of ultrasonic echo data from deformed tissues are analyzed to define a signal processing approach. Measurements in flow phantoms, with and without vessel-simula

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Jammali, Adel, Afif Belkacem, Kamel Besbes, and Manell E. Zakharia. "Planar synthetic aperture processing (P‐SAS) to real acoustic data of underwater imaging." Journal of the Acoustical Society of America 123, no. 5 (2008): 3899. http://dx.doi.org/10.1121/1.2935870.

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Schiefler, Nivaldo, Joaquim Maia, Fabio Schneider, Acácio Zimbico, Amauri Assef, and Eduardo Costa. "Generation and Analysis of Ultrasound Images Using Plane Wave and Sparse Arrays Techniques." Sensors 18, no. 11 (2018): 3660. http://dx.doi.org/10.3390/s18113660.

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Ultrasonic imaging is one of the most important techniques to help medical diagnosis. However, obtaining high quality images requires the acquisition, processing, and storage of a large amount of data. In this work, we evaluated a new ultrasound imaging technique based on plane wave and sparse arrays to increase the scan rate and reduce the amount of data amount to be stored. The performance of the proposed method was tested using simulated echo data (from Field II) and phantom data acquired using a Verasonics system equipped with a L11-4v linear array transducer. The tests were done using 128

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Klimonda, Ziemowit, Jerzy Litniewski, Piotr Karwat, and Andrzej Nowicki. "Spatial and Frequency Compounding in Application to Attenuation Estimation in Tissue." Archives of Acoustics 39, no. 4 (2015): 519–27. http://dx.doi.org/10.2478/aoa-2014-0056.

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Abstract The soft tissue attenuation is an interesting parameter from medical point of view, because the value of attenuation coefficient is often related to the state of the tissue. Thus, the imaging of the attenuation coefficient distribution within the tissue could be a useful tool for ultrasonic medical diagnosis. The method of attenuation estimation based on tracking of the mean frequency changes in a backscattered signal is presented in this paper. The attenuation estimates are characterized by high variance due to stochastic character of the backscattered ultrasonic signal and some spec

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Samimi, Kayvan, and Tomy Varghese. "Lower Bound on Estimation Variance of the Ultrasonic Attenuation Coefficient Using the Spectral-Difference Reference-phantom Method." Ultrasonic Imaging 39, no. 3 (2016): 151–71. http://dx.doi.org/10.1177/0161734616674329.

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Ultrasonic attenuation is one of the primary parameters of interest in Quantitative Ultrasound (QUS). Non-invasive monitoring of tissue attenuation can provide valuable diagnostic and prognostic information to the physician. The Reference Phantom Method (RPM) was introduced as a way of mitigating some of the system-related effects and biases to facilitate clinical QUS applications. In this paper, under the assumption of diffuse scattering, a probabilistic model of the backscattered signal spectrum is used to derive a theoretical lower bound on the estimation variance of the attenuation coeffic

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Zhang, Haiyan, Mintao Shao, Guopeng Fan, Hui Zhang, Wenfa Zhu, and Qi Zhu. "Phase Coherence Imaging for Near-Surface Defects in Rails Using Cross-Correlation of Ultrasonic Diffuse Fields." Metals 9, no. 8 (2019): 868. http://dx.doi.org/10.3390/met9080868.

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In this paper, phase coherence imaging is proposed to improve spatial resolution and signal-to-noise ratio (SNR) of near-surface defects in rails using cross-correlation of ultrasonic diffuse fields. The direct signals acquired by the phased array are often obscured by nonlinear effects. Thus, the output image processed by conventional post-processing algorithms, like total focus method (TFM), has a blind zone close to the array. To overcome this problem, the diffuse fields, which contain spatial phase correlations, are applied to recover Green’s function. In addition, with the purpose of impr

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Blyth, Matthew, Naoki Sakiyama, Hiroshi Hori, et al. "Revealing Hidden Information: High-Resolution Logging-While-Drilling Slowness Measurements and Imaging Using Advanced Dual Ultrasonic Technology." Petrophysics – The SPWLA Journal of Formation Evaluation and Reservoir Description 62, no. 1 (2021): 89–108. http://dx.doi.org/10.30632/pjv62n1-2021a6.

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A new logging-while-drilling (LWD) acoustic tool has been developed with novel ultrasonic pitch-catch and pulse-echo technologies. The tool enables both high-resolution slowness and reflectivity images, which cannot be addressed with conventional acoustic logging. Measuring formation elastic-wave properties in complex, finely layered formations is routinely attempted with sonic tools that measure slowness over a receiver array with a length of 2 ft or more depending upon the tool design. These apertures lead to processing results with similar vertical resolutions, obscuring the true slowness o

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Culshaw, B., S. G. Pierce, and W. J. Staszekski. "Condition monitoring in composite materials: An integrated systems approach." Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 212, no. 3 (1998): 189–202. http://dx.doi.org/10.1243/0959651981539398.

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This paper presents the results of a collaborative project, the objective of which was to investigate the potential offered by combining ultrasonic Lamb wave interrogation of composite material structures, insonifying the whole structure, with a single wavefront integrating optical fibre detector. The system, which was designed primarily for condition monitoring rather than defect imaging, proved to be capable of detecting small (centimetre square) delaminations, millimetre-sized holes and impact damages of a few joules, all with insonification wavelengths of the order of 2 cm. Data extraction

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Chen, Yuling, Yang Lou, and Jesse Yen. "Dynamic Transmit–Receive Beamforming by Spatial Matched Filtering for Ultrasound Imaging with Plane Wave Transmission." Ultrasonic Imaging 39, no. 4 (2017): 207–23. http://dx.doi.org/10.1177/0161734617692017.

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During conventional ultrasound imaging, the need for multiple transmissions for one image and the time of flight for a desired imaging depth limit the frame rate of the system. Using a single plane wave pulse during each transmission followed by parallel receive processing allows for high frame rate imaging. However, image quality is degraded because of the lack of transmit focusing. Beamforming by spatial matched filtering (SMF) is a promising method which focuses ultrasonic energy using spatial filters constructed from the transmit–receive impulse response of the system. Studies by other res

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He, Jiaze, Daniel C. Rocha, and Paul Sava. "Guided wave tomography based on least-squares reverse-time migration." Structural Health Monitoring 19, no. 4 (2019): 1237–49. http://dx.doi.org/10.1177/1475921719880296.

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A key to successful damage diagnostics and quantification is damage imaging through ultrasonic guided wave tomography. We propose the implementation of least-squares reverse-time migration in a circular array for damage imaging in an aluminum plate. The theory of least-squares reverse-time migration is formulated for guided wave applications along with the summary of an efficient optimization algorithm: the conjugate gradient method. Numerical simulation and laboratory experiments are used to evaluate its performance with a circular array setup. In order to improve the data processing efficien

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Rodenacker, Karsten, Klaus Hahn, Gerhard Winkler, and Dorothea P. Auer. "SPATIO-TEMPORAL DATA ANALYSIS WITH NON-LINEAR FILTERS: BRAIN MAPPING WITH fMRI DATA." Image Analysis & Stereology 19, no. 3 (2011): 189. http://dx.doi.org/10.5566/ias.v19.p189-194.

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Spatio-temporal digital data from fMRI (functional Magnetic Resonance Imaging) are used to analyse and to model brain activation. To map brain functions, a well-defined sensory activation is offered to a test person and the hemodynamic response to neuronal activity is studied. This so-called BOLD effect in fMRI is typically small and characterised by a very low signal to noise ratio. Hence the activation is repeated and the three dimensional signal (multi-slice 2D) is gathered during relatively long time ranges (3-5 min). From the noisy and distorted spatio-temporal signal the expected respons

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Brandner, Paul A., James A. Venning, and Bryce W. Pearce. "Wavelet analysis techniques in cavitating flows." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 376, no. 2126 (2018): 20170242. http://dx.doi.org/10.1098/rsta.2017.0242.

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Cavitating and bubbly flows involve a host of physical phenomena and processes ranging from nucleation, surface and interfacial effects, mass transfer via diffusion and phase change to macroscopic flow physics involving bubble dynamics, turbulent flow interactions and two-phase compressible effects. The complex physics that result from these phenomena and their interactions make for flows that are difficult to investigate and analyse. From an experimental perspective, evolving sensing technology and data processing provide opportunities for gaining new insight and understanding of these comple

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Urosevic, Milovan, Ganesh Bhat, and Marcos Hexsel Grochau. "Targeting nickel sulfide deposits from 3D seismicreflection data at Kambalda, Australia." GEOPHYSICS 77, no. 5 (2012): WC123—WC132. http://dx.doi.org/10.1190/geo2011-0514.1.

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The greenstone belts of the Yilgarn Craton, Western Australia, host numerous Archaean gold, nickel, and iron ore deposits. These deposits typically are found in complex geologic structures hidden by a deep, heterogeneous, and often conductive regolith profile. This added complexity limits the depth of penetration for the potential field methods, but at the same time opens new revenue possibilities through the application of seismic methods. To explore this opportunity, we acquired high-resolution, experimental, 3D seismic data over Lake Lefroy in Kambalda, Western Australia. The main objective

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Greenhalgh, Stewart A., Iain M. Mason, and Cvetan Sinadinovski. "In‐mine seismic delineation of mineralization and rock structure." GEOPHYSICS 65, no. 6 (2000): 1908–19. http://dx.doi.org/10.1190/1.1444875.

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Significant progress has been made towards the goal of generating detailed seismic images as an aid to mine planning and exploration at the Kambalda nickel mines of Western Australia. Crosshole and vertical‐seismic‐profiling instrumentation, including a slimline multi‐element hydrophone array, three‐component geophone sensors, and a multishot detonator sound source, have been developed along with special seismic imaging software to map rock structure. Seismic trials at the Hunt underground mine established that high frequency (> 1 kHz) signals can be propagated over distances of tens of met

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Zhang, Qinghui, Yufeng Zhang, Yi Zhou, Kun Zhang, Kexin Zhang, and Lian Gao. "An Ultrasound Simulation Model for the Pulsatile Blood Flow Modulated by the Motion of Stenosed Vessel Wall." BioMed Research International 2016 (2016): 1–16. http://dx.doi.org/10.1155/2016/8502873.

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This paper presents an ultrasound simulation model for pulsatile blood flow, modulated by the motion of a stenosed vessel wall. It aims at generating more realistic ultrasonic signals to provide an environment for evaluating ultrasound signal processing and imaging and a framework for investigating the behaviors of blood flow field modulated by wall motion. This model takes into account fluid-structure interaction, blood pulsatility, stenosis of the vessel, and arterial wall movement caused by surrounding tissue’s motion. The axial and radial velocity distributions of blood and the displacemen

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Aref, Mohamed, Ramy Abdlaty, Mohamed Abbass, Ibrahim Aboughaleb, Ayman Nassar, and Abou-Bakr Youssef. "Optical Signature Analysis of Liver Ablation Stages Exploiting Spatio-Spectral Imaging." Journal of Biomedical Photonics & Engineering 7, no. 2 (2021): 020306. http://dx.doi.org/10.18287/jbpe21.07.020306.

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Background and Objective: Thermal ablation modalities such as Radiofrequency ablation (RFA) / Microwave ablation (MWA) are deliberately used for marginally invasive tumor removal by escalating tissue temperature. For precise tumor extinguish, thermal ablation outcomes need routine monitoring for tissue necrosis in a challenging research task. The study aims to exploit hyperspectral imaging (HSI) to evaluate the impact of the liver tissue ablation. Materials and Methods: RFA with temperature range (≥80 °C) was accomplished on the ex vivo animal liver and evaluated using a spectral camera (400~1

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CAITI, ANDREA, MARIA PALMESE, and ANDREA TRUCCO. "RISK ASSESSMENT OF SEAFLOOR WASTE: ACOUSTICAL IMAGING OF BURIED WASTE." Journal of Computational Acoustics 13, no. 02 (2005): 385–401. http://dx.doi.org/10.1142/s0218396x05002694.

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This work describes some of the ongoing activities in the framework of the EU-sponsored project SITAR aimed at developing acoustic methods for imaging of waste barrels/containers of small dimension buried in unconsolidated sea sediments. In particular, the work relies on acoustic sub-bottom scattering measurement techniques, with adaptive geometrical configuration of the transmitting/receiving system. The approach ultimately leads to a full 3D measurement of the acoustic scattered field, including bottom and sub-bottom effects, plus the scattering due to buried objects in the scene. The 3D den

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Wang, Bing, Shuncong Zhong, Tung-Lik Lee, Kevin S. Fancey, and Jiawei Mi. "Non-destructive testing and evaluation of composite materials/structures: A state-of-the-art review." Advances in Mechanical Engineering 12, no. 4 (2020): 168781402091376. http://dx.doi.org/10.1177/1687814020913761.

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Composite materials/structures are advancing in product efficiency, cost-effectiveness and the development of superior specific properties. There are increasing demands in their applications to load-carrying structures in aerospace, wind turbines, transportation, medical equipment and so on. Thus, robust and reliable non-destructive testing of composites is essential to reduce safety concerns and maintenance costs. There have been various non-destructive testing methods built upon different principles for quality assurance during the whole lifecycle of a composite product. This article reviews

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Graves, Edward E., Andrea Pirzkall, Tracy R. Mcknight, et al. "USE OF PROTON MAGNETIC RESONANCE SPECTROSCOPIC IMAGING DATA IN PLANNING FOCAL RADIATION THERAPIES FOR BRAIN TUMORS." Image Analysis & Stereology 21, no. 2 (2011): 69. http://dx.doi.org/10.5566/ias.v21.p69-76.

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Advances in radiation therapy for malignant neoplasms have produced techniques such as Gamma Knife radiosurgery, capable of delivering an ablative dose to a specific, irregular volume of tissue. However, efficient use of these techniques requires the identification of a target volume that will produce the best therapeutic response while sparing surrounding normal brain tissue. Accomplishing this task using conventional computed tomography (CT) and contrast-enhanced magnetic resonance imaging (MRI) techniques has proven difficult because of the difficulties in identifying the effective tumor ma

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Karaman, M., and M. O'Donnell. "Subaperture processing for ultrasonic imaging." IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control 45, no. 1 (1998): 126–35. http://dx.doi.org/10.1109/58.646917.

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Tao, L., X. R. Ma, H. Tian, and Z. X. Guo. "PHASE SUPERPOSITION PROCESSING FOR ULTRASONIC IMAGING." Journal of Sound and Vibration 193, no. 5 (1996): 1015–21. http://dx.doi.org/10.1006/jsvi.1996.0328.

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García Nocetti, D. F., J. Solano González, M. F. Valdivieso Casique, R. Ortiz Ramírez, and E. Moreno Hernández. "Parallel Processing in Real-Time Ultrasonic Imaging." IFAC Proceedings Volumes 30, no. 3 (1997): 293–97. http://dx.doi.org/10.1016/s1474-6670(17)44506-x.

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Haridasan, G. "Developments of Ultrasonic Imaging and Image Processing." IETE Technical Review 11, no. 1 (1994): 37–41. http://dx.doi.org/10.1080/02564602.1994.11437416.

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