2009 IEEE International Ultrasonics Symposium最新文献

{"title":"2D Finite Impulse Response filters for surface wave identification","authors":"L. Martinez, B. Sarens, C. Glorieux, C. Glorieux","doi":"10.1109/ULTSYM.2009.5441443","DOIUrl":"https://doi.org/10.1109/ULTSYM.2009.5441443","url":null,"abstract":"Elliptical areas transfer function Finite Impulse Response filters are investigated (E-FIR). The main axis of the elliptical area is oriented along the selected surface wave dispersion curve. The advantage of such areas is the analytical formulas of the impulse responses as a function of the frequencies bandwidths parameters, k and ω, without the need to use Inverse Fourier transform. E-FIR filters are tested on experimental space-time signals corresponding to the propagation of Lamb waves generated by a pulse and observed by classic transducers on a cylindrical shell and by laser Doppler on a plate. E-FIR filters exhibit their potential to extract Lamb modes and their direction of propagation, even in noisy datasets. Due to their natural round shape energy distribution in k-ω space, E-FIR filtering adds few artefacts to the filtered signals. By using wide k-bandwidth and narrow ω-bandwidth E-FIR filter, Gabor like analysis is also reached.","PeriodicalId":368182,"journal":{"name":"2009 IEEE International Ultrasonics Symposium","volume":"63 8","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114114149","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":"Extracting fast and slow wave velocities and attenuations from experimental measurements of cancellous bone using Bayesian probability theory","authors":"C. C. Anderson, M. Pakula, M. Holland, G. Bretthorst, P. Laugier, James G. Miller","doi":"10.1109/ULTSYM.2009.5441732","DOIUrl":"https://doi.org/10.1109/ULTSYM.2009.5441732","url":null,"abstract":"The consensus among many laboratories is that the attenuation coefficient of cancellous bone exhibits an approximately linear-with-frequency dependence. In the majority of cases, the phase velocity decreases with frequency. This negative dispersion appears to be inconsistent with the causality-imposed Kramers-Kronig (KK) relations for media with a linear-with-frequency attenuation coefficient. The porous structure of cancellous bone can support two compressional waves, known as a fast wave and a slow wave, that can overlap in time. Our laboratory in St. Louis has sought to explain the observed negative dispersion as an artifact of analyzing rf data containing two interfering waves as if only one wave were present. In this study, the inverse problem of how to recover the individual fast and slow waves from interference data was addressed. Waves transmitted through bone samples were analyzed using Bayesian probability theory to recover the individual properties of the fast and slow waves. Data at nine independent sites were acquired in Paris on a bovine femur condyle sample using broadband 500 kHz center frequency transducers. Each rf line served as input to a Bayesian analysis program. In the Bayesian calculation, ultrasonic wave propagation through cancellous bone was modeled as the superposition of two plane waves characterized by a linear-with-frequency attenuation coefficient and a logarithmic-with-frequency increasing phase velocity. The calculation employed Markov chain Monte Carlo (MCMC) to obtain estimates of the joint posterior probability for all parameters in the model. In all cases where the data processed by conventional means exhibited negative dispersion, two waves with positive dispersions were recovered with Bayesian analysis. The mean ± SD fast and slow wave velocities for the nine sites analyzed were (2072 ± 43) m/s and (1518 ± 22) m/s, respectively. The mean ± SD slopes of the attenuation coefficients were (17.3 ± 9.9) dB/cm/MHz and (10.8 ± 5.1) dB/cm/MHz for the fast and slow waves, respectively. Many complicating factors, including phase cancellation at the face of a piezoelectric receiver and diffraction effects, are not explicitly accounted for in the present model. Nevertheless, the Bayesian models proved to be a reliable method for recovering fast and slow waves from data that yielded negative dispersions when processed as if a single wave were present.","PeriodicalId":368182,"journal":{"name":"2009 IEEE International Ultrasonics Symposium","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116271868","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 imaging of the heart using circular wave synthetic imaging with phased arrays","authors":"M. Couade, M. Pernot, M. Tanter, E. Messas, A. Bel, M. Ba, A. Hagège, M. Fink","doi":"10.1109/ULTSYM.2009.5441640","DOIUrl":"https://doi.org/10.1109/ULTSYM.2009.5441640","url":null,"abstract":"The concept of synthetic imaging using circular wave is proposed to image with a very large field of view and at a very high frame rate (>1000 images/sec) heart motions with a conventional cardiac phased array probe. The goal of this study is to demonstrate in vivo the feasibility of this technique. Experiments are first performed in-vitro on ultrasound phantoms to optimize the trade-off between image quality and frame rate. An in vivo study is then performed on 10 sheep with a conventional phased array probe placed directly on the epicardium at different locations to obtain cine-loop of a complete heart cycle in the conventional imaging planes (long and short axis). After classical post processing of acquired cine-loop (wall tracking and tissue Doppler velocity estimation), the propagation of mechanical waves induced naturally during the heart cycle such as aortic and mitral valves closure can be observed.","PeriodicalId":368182,"journal":{"name":"2009 IEEE International Ultrasonics Symposium","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116315291","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 wideband annular piezoelectric composite transducer configuration with a graded active layer profile","authors":"S. Ramadas, R. O’Leary, A. Gachagan, G. Hayward, R. Banks","doi":"10.1109/ULTSYM.2009.5441479","DOIUrl":"https://doi.org/10.1109/ULTSYM.2009.5441479","url":null,"abstract":"Ultrasound technology is routinely used in many application areas including underwater sonar, biomedicine, non destructive evaluation (NDE), materials characterisation and process control - all with direct routes into the vital economic sectors of energy, transportation, healthcare and food and drink. As technology demands have increased, device manufacturers are faced with a constant need to extend bandwidth and/or frequency response, while at the same time improve sensitivity, all combined with minimisation of size, complexity and cost. It is becoming increasingly apparent that the current transducer technology, with its emphasis on multi-element array systems, is nearing saturation and new approaches to ultrasonic system design and operation are needed to satisfy many future demands. This paper presents wideband annular piezoelectric configuration with graded composite active layer.","PeriodicalId":368182,"journal":{"name":"2009 IEEE International Ultrasonics Symposium","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121539979","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":"Enhancement of doxorubicin effect on cancer cell mortality with ultrasound and microbubbles","authors":"J. Piron, K. Kaddur, A. Bouakaz","doi":"10.1063/1.3367131","DOIUrl":"https://doi.org/10.1063/1.3367131","url":null,"abstract":"Doxorubicin is an important potent anti-cancer drug and is used for the treatment of various malignancies. Although its effectiveness is proved, its adverse effects are regarded as a problem. Ultrasound and microbubbles are considered as a potent method to enhance doxorubicin effect by reducing the dose of administered drug and thus its side effects.","PeriodicalId":368182,"journal":{"name":"2009 IEEE International Ultrasonics Symposium","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124415011","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":"Multilayered shear wave resonator consisting of c-axis tilted ZnO films","authors":"N. Morisato, S. Takayanagi, T. Yanagitani, M. Matsukawa, Yoshiaki Watanabe","doi":"10.1109/ULTSYM.2009.5441444","DOIUrl":"https://doi.org/10.1109/ULTSYM.2009.5441444","url":null,"abstract":"Multilayer resonator consisting of six layered ZnO films was fabricated using RF magnetron sputtering. To prevent degradation of crystalline orientation, SiO2 buffer layers were inserted between each ZnO layer. The influences of the method for SiO2 deposition on the crystalline orientation also have been investigated. Crystalline orientation of the c-axis tilted ZnO films were confirmed by XRD pole figure analysis and SEM images. In the sixth order mode shear mode resonant frequency, high efficient shear mode excitation with relatively suppressed extensional mode excitation was observed. More extensional mode suppression is expected by increasing the number of the layer.","PeriodicalId":368182,"journal":{"name":"2009 IEEE International Ultrasonics Symposium","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126264032","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":"Evaluation of an analytical solution to the Burgers equation based on Volterra series","authors":"M. Schiffner, M. Mleczko, G. Schmitz","doi":"10.1109/ULTSYM.2009.5442057","DOIUrl":"https://doi.org/10.1109/ULTSYM.2009.5442057","url":null,"abstract":"A simple, well-interpretable, and explicit analytical solution to the Burgers equation based on Volterra series is derived. Its region of convergence is investigated and a method for the computationally efficient numerical evaluation of the associated Volterra polynomials is presented. For a given boundary condition, numerical results are compared to a widely-used numerical standard solution. After a propagation distance of 10 cm in steps of 5 mm the Volterra polynomials of degree 2 and 3 achieve relative errors in terms of the L2-norm of 4.22% and 1.35%, respectively.","PeriodicalId":368182,"journal":{"name":"2009 IEEE International Ultrasonics Symposium","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127929425","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":"Parameter sensitivity study of a Field II multilayer transducer model on a convex transducer","authors":"David Baek, J. A. Jensen, M. Willatzen","doi":"10.1109/ULTSYM.2009.5441669","DOIUrl":"https://doi.org/10.1109/ULTSYM.2009.5441669","url":null,"abstract":"The influence of different model parameters describing a multilayer transducer model is addressed by altering each single simulation parameter within ±20% in steps of 2% and by calculating the pressure and the intensity at a field point located 112 mm from the source. The simulations are compared with a hydrophone measured pressure pulse and intensity from a single element of a 128 element convex medical transducer. Results show that mainly the lens material and the ceramic material are of importance for errors in the pressure pulse prediction. Specifically the thickness, the density, and the stiffness constants are of significance. Among the results it is found that a -4% change in lens stiffness yields a 6% relative error change and a -4% change in ceramic stiffness yields a -1.2% relative error change. When calculating intensity the piezoceramic and electronic driving circuits are of importance, where a similar change in the lens and the ceramic stiffness shows a -0.1% and a -12% relative error change, respectively.","PeriodicalId":368182,"journal":{"name":"2009 IEEE International Ultrasonics Symposium","volume":"113 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115816976","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":"Material evaluation with new modulation method in photoacoustic technique","authors":"A. Minamide, Y. Tokunaga","doi":"10.1109/ULTSYM.2009.5441955","DOIUrl":"https://doi.org/10.1109/ULTSYM.2009.5441955","url":null,"abstract":"The proposed new method partially solves the problem of low signal-to-noise-ratio (SNR) when modulation frequency increases. In this paper, the authors suggest keeping the amplitude of the detected photoacoustic (PA) signal constant by linearly increasing the modulation voltage versus the frequency. This technique decreases the SNR at low frequencies but increases the SNR in the usual noisy band and the PA signal of the sample can be easily estimated by FFT. Furthermore, the technique is demonstrated to effectively detect a subsurface defect in a graphite sample in the 10–100 Hz frequency range.","PeriodicalId":368182,"journal":{"name":"2009 IEEE International Ultrasonics Symposium","volume":"247 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132532062","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":"Investigation of SAW atomization","authors":"A. Qi, J. Friend, L. Yeo","doi":"10.1109/ULTSYM.2009.5441556","DOIUrl":"https://doi.org/10.1109/ULTSYM.2009.5441556","url":null,"abstract":"Surface acoustic wave atomization is promising in various kinds of industrial and pharmaceutical processes. In order to properly apply this technology for a wide range of applications, controlling the aerosol size distribution is crucial. It is widely believed that the aerosol size can be controlled by the driving frequency, our experimental results, show a rather weak frequency dependence, especially when the driving frequency is above 10 MHz. Fundamental studies were therefore carried out to determine the underlying mechanism associated with the destabilization of the liquid interface leading towards atomization with the objective of elucidating this apparent contradiction. Our investigation supports the notion that the droplet sizes appear to be governed by the capillary vibration frequency given by a balance between the capillary stress and viscous forcing, not the driving frequency as previously claimed. Furthermore, the aerosol size can be altered by controlling the surface tension and viscosity. For this case, we employ the laser diffraction to obtain the size distributions of octanol aerosol and water aerosol generated by SAWatomization. The experimental results matches our theocratical prediction that water, with higher surface tension and lower viscosity, generates relatively larger aerosols than octanol.","PeriodicalId":368182,"journal":{"name":"2009 IEEE International Ultrasonics Symposium","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129967069","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}