2009 IEEE International Ultrasonics Symposium最新文献

{"title":"Ultrasonic probes simultaneously producing one longitudinal and two shear waves and their potential applications","authors":"K.-T. Wu, C. Jen, M. Kobayashi, Liang Zhao","doi":"10.1109/ULTSYM.2009.5441413","DOIUrl":"https://doi.org/10.1109/ULTSYM.2009.5441413","url":null,"abstract":"Ultrasonic probes which can simultaneously generate and receive two orthogonal polarized shear (S<inf>⊥</inf> and S<inf>//</inf>) and longitudinal (L) waves in screw shape have been presented. Thick piezoelectric films are directly fabricated onto the heads of such probes as L wave integrated ultrasonic transducers. S<inf>⊥</inf> and S<inf>//</inf> waves are obtained using mode conversion method. Application of such probes for on-line polymer injection molding process diagnostics is demonstrated.","PeriodicalId":368182,"journal":{"name":"2009 IEEE International Ultrasonics Symposium","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126983104","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Angular spectrum method for the estimation of the lateral profile of the ultrasound pressure field of the third harmonic","authors":"M. Pasovic, M. Danilouchkine, P. van Neer, O. Basset, C. Cachard, A. V. D. van der Steen, N. de Jong","doi":"10.1109/ULTSYM.2009.5441983","DOIUrl":"https://doi.org/10.1109/ULTSYM.2009.5441983","url":null,"abstract":"Nonlinear propagation is an important physical phenomenon, which is exploited in ultrasound harmonic imaging. Second harmonic imaging, is most often used in clinical practice. By using higher harmonics image quality and tissue characterization may be further improved. There is a clear need to model and understand the ultrasound field of the higher harmonics. Numerical simulations, often based on KZK equation, for studying nonlinear wave propagation are time consuming. In this paper, we present a closed-form solution for the higher harmonics pressure fields and propose a light-weighted procedure, based on the angular spectrum method (ASM), to compute them. Using the successive approximation method, we have derived an analytical expression, which predicts the change of the shape of the transmitted signal during propagation in a lossless medium. The theoretical findings were corroborated on the lateral beam profiles of a phased-array ultrasound transducer. The relative difference in the main lobe width between measurement and simulations at ™6 dB was 5.5%, 6.5%, and 2.9% for 1st, 2nd, and 3rd harmonic, respectively. The same parameters at ™10 dB were of the same order of magnitude, with the exception of the 3rd harmonic difference being 0.7%.","PeriodicalId":368182,"journal":{"name":"2009 IEEE International Ultrasonics Symposium","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122143889","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Measurement of electric properties in a ZnO single crystal via electromechanical coupling using Brillouin scattering method","authors":"T. Yanagitani, H. Sano, M. Matsukawa","doi":"10.1109/ULTSYM.2009.5441851","DOIUrl":"https://doi.org/10.1109/ULTSYM.2009.5441851","url":null,"abstract":"In-plane directional electric property measurement in the semiconductors via electromechanical coupling is proposed. To estimate the properties in the crystal with less than 1 Ω·m (which is general value in intrinsic wide band-gap semiconductors), in-plane directional GHz bulk acoustic wave velocities and attenuations in a ZnO crystal have been theoretically and experimentally investigated, using Brillouin scattering method. Distribution of electric properties in the crystal, also separately measured by the electrode, has been clearly detected by the acoustic velocity distribution measurement.","PeriodicalId":368182,"journal":{"name":"2009 IEEE International Ultrasonics Symposium","volume":"123 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126222077","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analysis of human fibroadenomas using three-dimensional impedance maps","authors":"Alexander J. Dapore, Michael R. King, J. Harter, Sandhya Sarwate, M. Oelze, J. Zagzebski, M. Do, T. Hall, W. O’Brien","doi":"10.1109/ULTSYM.2009.5441831","DOIUrl":"https://doi.org/10.1109/ULTSYM.2009.5441831","url":null,"abstract":"Three-dimensional impedance maps (3DZMs) are virtual volumes of acoustic impedance values constructed from histology to represent tissue microstructure acoustically. From the 3DZM, estimations can be made for ultrasonic backscatter and scatterer properties, such as effective scatterer diameter (ESD). Additionally, the 3DZM can be exploited to visualize and identify possible scattering sites, which may aid in the development of more effective scattering models to better represent the ultrasonic interaction with underlying tissue microstructure. In this study, 3DZMs were created from several human fibroadenoma samples. ESD estimates were obtained using the fluid-filled sphere form factor model. These estimates were made using two regions of interest (ROIs) sizes: cubes of side length 300 µm and 150 µm. This estimation technique allowed a better understanding of the spatial distribution and variability of the estimates throughout the volume. For a collection of 33 3DZMs, the ESD was estimated to be 99±43 µm with the large ROI and 65±30 µm when using the small ROI. The 3DZMs were then investigated visually to identify possible scattering sources, which conformed to the estimated characteristic scatterer dimensions. This visualization and comparison resulted in the identification of possible ultrasonic scattering sources within human fibroadenomas.","PeriodicalId":368182,"journal":{"name":"2009 IEEE International Ultrasonics Symposium","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131062620","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Clinical value of two compounding techniques for IVUS Palpography","authors":"M. Danilouchkine, F. Mastik, A. V. D. van der Steen","doi":"10.1109/ULTSYM.2009.5441622","DOIUrl":"https://doi.org/10.1109/ULTSYM.2009.5441622","url":null,"abstract":"This study aims at the in-vivo assessment of two compounding techniques for IVUS Palpography. To increase the elastographic contrast-to-noise ratio, Doyley et. al. proposed a compounding scheme for IVUS Palpography [1]. The neighboring IVUS frames acquired at diastole are paired to compute the luminal strain profiles or partial palpograms. Subsequently, the obtained strain maps are averaged to form a final compounded strain profile for a given cross-section of a coronary artery. This first scheme is further referred to as the classical compounding. The second scheme explicitly takes into account that the measured strains are only partially available. It attempts at reconstructing the missing elasticity values by using the available strain information in its direct vicinity using the Normalized Convolution method. The improved partial strain profiles are subsequently averaged in the same manner as in classical compounding. This scheme was coined as reconstructive compounding. Eight in-vivo IVUS pullbacks were used for the comparative analysis. The percentage of valid strains was 28.6±13.7% for the scheme without compounding, 94.3±4.4% and 99.7 ± 0.2% for the classical and reconstructive methods, respectively. Implementation of the compounding schemes significantly boosts the diagnostic information coming out of IVUS Palpography with the reconstructive scheme being the best.","PeriodicalId":368182,"journal":{"name":"2009 IEEE International Ultrasonics Symposium","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116222751","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Piezoelectric composite film for acoustic emission detection","authors":"W. Sakamoto, R. Higuti, M. M. Tiago","doi":"10.1109/ULTSYM.2009.5441422","DOIUrl":"https://doi.org/10.1109/ULTSYM.2009.5441422","url":null,"abstract":"The continuous technological advances require materials with properties that conventional material cannot display. Material property combinations are being the focus to the development of composite materials, which are considered a multiphase material that exhibits properties of the constituent phases. One interesting material to be studied as sensing material is the composite made of ferroelectric ceramic and polymeric matrix as a two-phases composite material. In that case, the combinations properties intended are the high piezo and pyroelectric activities of the dense ceramic with the impact resistance, flexibility, formability and low densities of the polymer. Using the piezoelectric property of the composite film, it can be used to detect acoustic emission (AE), which is a transient elastic wave generated by sudden deformation in materials under stress. AE can be applied for evaluating the “health” of structures in a nondestructive way and without any lapse of time. The preliminary result indicates that the composite Pz34/PEEK can be used as sensing material for nondestructive evaluation.","PeriodicalId":368182,"journal":{"name":"2009 IEEE International Ultrasonics Symposium","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121899387","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optical observations of microbubble oscillation in small tubes","authors":"David H. Thomas, V. Sboros, M. Emmer, H. Vos, N. de Jong","doi":"10.1109/ULTSYM.2009.5441434","DOIUrl":"https://doi.org/10.1109/ULTSYM.2009.5441434","url":null,"abstract":"In diagnostic medicine, microbubbles are used as contrast agents to image blood flow. However, the effect of microvessels surrounding the oscillating microbubbles (MBs) is under investigated. Here, oscillations of Definity (Lantheus Imaging) microbubbles in tubes with inner diameter of 25µm and 200µm are compared in response to low acoustic driving pressure, using the ultrahigh speed Brandaris 128 camera, at frame rates of ∼12 million frames per second. A significant reduction in oscillation was observed for MBs in the smaller 25µm tube, when compared to those in a 200µm tube. In the 25µm tube, at 50kPa an increased incidence of MBs which did not oscillate above the noise level of the system was observed (56% of MBs compared to 8% in the 200µm tube), indicating an increased oscillation damping. Unlike theoretical predictions no significant difference was observed between the resonance frequency curves calculated for MBs in 25µm and 200µm tubes. While previous investigators have shown the effect of microvessels on MB oscillation at high ultrasound pressures, the present study provides the first optical images of low amplitude microbubble oscillations in small tubes.","PeriodicalId":368182,"journal":{"name":"2009 IEEE International Ultrasonics Symposium","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121731678","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A quantitative assessment for the orientation and distribution of carbon fibers in the bipolar plate of fuel cell using high frequency ultrasound","authors":"Yi-Hsun Lin, Chih-Chung Huang, Shyh-Hau Wang","doi":"10.1109/ULTSYM.2009.5441684","DOIUrl":"https://doi.org/10.1109/ULTSYM.2009.5441684","url":null,"abstract":"Conductive polymer composites fabricated by adding a certain amount of conductive fillers, such as carbon black or carbon nanotube, into a polymer substrate are commonly used as the material of the bipolar plate in fuel cells. The electrical conductivity of polymer composites is affected by the distribution and orientation of fillers and is therefore crucial to be assessed. This study is to develop methods and techniques for nondestructively measuring properties of carbon fibers in the conductive polymer composite using a high frequency ultrasound system. The experiments were carried out from samples, fabricated by an injection molding machine, composed of a 5×5 cm polycarbonate added with carbon fibers of 6 µm diameter and 3 mm length and those of weight percentage at 0, 0.1, 0.2, and 0.3%. The ultrasonic signals of conductive polymer composites associated with different filler concentrations were acquired from a 48 MHz high frequency ultrasound imaging system. The raster scanning images corresponding to depths at 0.15 and 0.3 mm beneath the surface of conductive polymer composites were reconstructed. The orientation of filler carbon fibers parallel or perpendicular to the surface of conductive polymer composites were calculated according to their respective percentages of pixel content in the image. Results showed that percentages of pixel contents for fillers of carbon fibers at the depth of 0.15 mm beneath the surface of sample for those 0.1, 0.2, and 0.3 wt% filler carbon fibers were calculated to be 2.50±1.13, 5.19±1.70, and 5.93±1.29, respectively, and those of 0.3mm were to be 2.91±1.46, 6.18±1.60, and 6.42±1.77, respectively. Moreover, those percentages of pixel contents for fillers of perpendicular orientation with respect to depth of 0.15mm were 1.49±0.89, 2.49±0.96, and 3.62±0.95, respectively; those of 0.3mm were 1.39±0.72, 2.70±0.62, and 3.97±0.94, respectively. This study demonstrated that current high frequency ultrasound image incorporated with the analysis method is feasible to be applied to quantitatively and rapidly assess the distributions of fillers in conductive polymer composites.","PeriodicalId":368182,"journal":{"name":"2009 IEEE International Ultrasonics Symposium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130654859","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ultrafast framing optical and acoustical recording of nonlinearly oscillating microbubbles","authors":"H. Vos, N. de Jong, R. Mori, J. Viti, F. Guidi, P. Tortoli, J. Sijl","doi":"10.1109/ULTSYM.2009.5441888","DOIUrl":"https://doi.org/10.1109/ULTSYM.2009.5441888","url":null,"abstract":"Microbubble nonlinear behavior improves detection efficacy of ultrasound contrast agents (UCAs), but not all microbubble sizes present in the dispersed UCA population will contribute to the detection signal. This paper experimentally studies the relation between size and nonlinear response of isolated lipid-coated microbubbles, held in a transparent tube. The echo from microbubbles is acoustically recorded with a sensitive custom electronic system, and simultaneously the radial excursion is optically recorded with an ultrafast framing camera. Ultrasound-induced deflation is used to sample the bubble at multiple sizes. At sizes smaller than the resonant size the bubbles show compression-only behavior accompanied by strong second harmonic scattering. Subharmonics are observed for bubble sizes larger than resonant.","PeriodicalId":368182,"journal":{"name":"2009 IEEE International Ultrasonics Symposium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129333199","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dual pulse frequency compounded super harmonic imaging for phased array transducers","authors":"P. van Neer, M. Danilouchkine, G. Matte, M. Verweij, N. de Jong","doi":"10.1109/ULTSYM.2009.5441878","DOIUrl":"https://doi.org/10.1109/ULTSYM.2009.5441878","url":null,"abstract":"Second harmonic imaging is currently the standard in commercial echographic systems. A new modality, super harmonic imaging (SHI), is based on combining the 3rd to 5th harmonic generated during sound propagation in tissue. This emerging modality could further enhance resolution and quality of echographic images. To meet the bandwidth requirement for SHI an interleaved phased array was developed. Array elements used in transmission generally have bandwidths of ∼ 80% leading to gaps between harmonics in the spectral domain. This causes ripple artifacts in the echo image. Last year we introduced a new dual pulse frequency compounding method to reduce these artifacts and showed initial single element results [1]. In this work we implement and optimize the dual pulse method for an interleaved array on an ultrasound system and research its imaging characteristics, i.e. point spread functions (PSF). In the dual pulse SHI method each trace is constructed by the summing of two firings, the second slightly frequency shifted compared to the first. To study the dual pulse method's performance an interleaved array (44 1 MHz and 44 3.7 MHz elements, optimized for echocardiography) was used in combination with a fully programmable ultrasound system. Initial estimates for the frequencies of the first and second pulses as well as the pulse duration were optimized experimentally. Our findings confirm that the transfer functions of both transducer and system have to be taken into account to determine the optimal transmission frequencies for the dual pulse SHI method. Moreover, a trade off exists between dual pulse signal length and peak intensity. The optimal results with the dual pulse technique were achieved using a transmission length of 2.5 cycles and transmission frequencies of 0.87 MHz and 1.12 MHz. The lateral beam widths of the optimal dual pulse signal are 1.2 times smaller at the −6 dB level and equal at the −20 dB level compared to the third harmonic. The axial beam widths of the optimal dual pulse signal are 3.1 times smaller at the −6 dB level and 1.6 times smaller at the −20 dB level compared to the third harmonic. Not only does dual pulse method solve the ripple artifacts associated with imaging using multiple harmonic bands, dual pulse SHI has markedly improved axial and lateral resolutions compared to the third harmonic at higher than second harmonic intensities.","PeriodicalId":368182,"journal":{"name":"2009 IEEE International Ultrasonics Symposium","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129414103","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}