2010 IEEE International Ultrasonics Symposium最新文献

{"title":"Laterally coupled BAW filters with 5% bandwidth","authors":"J. Meltaus, T. Pensala","doi":"10.1109/ULTSYM.2010.5935612","DOIUrl":"https://doi.org/10.1109/ULTSYM.2010.5935612","url":null,"abstract":"Lateral coupling between thin-film bulk acoustic wave resonators (LBAW) is a promising technology for fabrication of bandpass filters. Previously, narrow bandwidth of realized filters has been the main problem for the applicability of this technology. In this paper, solidly-mounted LBAW filters with different number of electrodes and passband width up to 5% are presented. Thin-film AlN is used as the piezoelectric material with a Mo bottom electrode and an Al top electrode. Filters consist of interdigital electrodes with varied electrode number, electrode width and gap between the electrodes. Acoustic coupling strength obtained at 2 GHz varies from 1%…1.5% for 2-electrode devices to 5% given by 31-electrode filters. With post-measurement matching to 120 Ω ‖ 5 nH, electrical frequency response obtained with 31-electrode LBAW shows a minimum insertion loss of 2‖3 dB and a relative 3-dB bandwidth of 5% at 2 GHz. Effect of electrode number to filter passband is studied.","PeriodicalId":6437,"journal":{"name":"2010 IEEE International Ultrasonics Symposium","volume":"36 1","pages":"966-969"},"PeriodicalIF":0.0,"publicationDate":"2010-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78874705","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":"Frequency-temperature (f-T) behavior for different rotated quartz cuts at high temperatures and their Q-factor estimation","authors":"Mihir S. Patel, B. Sinha","doi":"10.1109/ULTSYM.2010.5935456","DOIUrl":"https://doi.org/10.1109/ULTSYM.2010.5935456","url":null,"abstract":"A theoretical study has been carried out for a 20 MHz circular resonator to evaluate the effect of high temperature on the frequency and the Q-factor of the slow (C-) and fast (B-) thickness-shear mode for the SC-cut, SBTC-cut, rotated X-cut and AT-cut using 3-D finite-element method (FEM). We have carried out a frequency spectrum analysis to select the best aspect ratio for each cut angle, based on the separation between the thickness-shear and flexural modes. The best aspect ratio for each cut angle was then investigated for the f-T behavior using the Lagrangian temperature coefficients of elastic constants. FEM results suggest a promising design for a 20 MHz SC-cut resonator which can operate over the temperature range of −50 to 300 deg C.","PeriodicalId":6437,"journal":{"name":"2010 IEEE International Ultrasonics Symposium","volume":"255 1","pages":"400-403"},"PeriodicalIF":0.0,"publicationDate":"2010-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76173281","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":"Brillouin spectroscopy applied to the characterization of SAW propagation losses in langasite","authors":"B. Vincent, T. Aubert, O. Elmazria, M. Seifaddini, D. Rouxel, J. Kruger","doi":"10.1109/ULTSYM.2010.5935760","DOIUrl":"https://doi.org/10.1109/ULTSYM.2010.5935760","url":null,"abstract":"High performance Brillouin microscopy has been used in order to directly measure the propagation losses of surface acoustic wave in Langasite substrate. The interdigital transducers (IDTs) were designed to generate several harmonics leading to induce acoustic waves with different wavelengths. The induced phonons were detected and characterized at different frequencies and at different distance from IDTs leading to precisely determine the propagation losses for all the excited frequencies 681, 1267 and 1463 MHz.","PeriodicalId":6437,"journal":{"name":"2010 IEEE International Ultrasonics Symposium","volume":"88 7 1","pages":"539-542"},"PeriodicalIF":0.0,"publicationDate":"2010-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87704854","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":"Robot integrated ultrasound geometry-scanning for trackerless bone cement detection in RTHR","authors":"S. Heger, T. Vollborn, M. Niggemeyer, T. Mumme, F. Chuembou, K. Radermacher","doi":"10.1109/ULTSYM.2010.5935724","DOIUrl":"https://doi.org/10.1109/ULTSYM.2010.5935724","url":null,"abstract":"Detection and removal of intra-femoral bone-cement in the context of revision total hip replacement (RTHR) can be a time-consuming and risky intervention. Within the framework of computer and robot assisted surgery a system for integrated intraluminal ultrasound based cement detection using a modular mini-robot is being developed. One challenge of an ultrasound based approach is that refraction and wave mode conversion at the water-cement interface will cause refraction distortion and artefacts respectively. In order to minimize measurement errors a scanning concept aiming on an almost perpendicular beam direction with respect to the local water cement interface scanning has been developed. Bone cement prepared ex-vivo femora have been ultrasound scanned and the results have been compared with golden standard CT data. The ultrasound integrated geometry scanner, the detection algorithms as well as the ex-vivo evaluation is presented as part of this contribution.","PeriodicalId":6437,"journal":{"name":"2010 IEEE International Ultrasonics Symposium","volume":"6 1","pages":"845-848"},"PeriodicalIF":0.0,"publicationDate":"2010-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87752239","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":"In vivo study of cerebral ischemia using Shear Wave Imaging and Ultrafast Doppler","authors":"E. Macé, G. Montaldo, M. Fink, M. Tanter, Abraham Martín, B. Tavitian","doi":"10.1109/ULTSYM.2010.5935870","DOIUrl":"https://doi.org/10.1109/ULTSYM.2010.5935870","url":null,"abstract":"A multi-modal ultrasound imaging study of cerebral ischemia was performed on a rat model. Ischemia was obtained by the transient 2h occlusion of a cerebral artery and the lesion induced was imaged 1, 2, 4 and 7 days after the stroke. With Bmode imaging, the lesion was found to be hyperechogenic compared to normal brain tissue. With Shear Wave Imaging, the elasticity of the brain was measured showing that the ischemic lesion is softer than normal brain tissue and that its elasticity decreases significantly over time. With Ultrafast Doppler, the perfusion in the brain was measured showing that the lesion is hyperperfused compared to normal brain tissue with a peak two days after the occlusion. Ultrafast Doppler was also proved able to monitor the occlusion. Future work will focused on applying this multi-modal study for ischemic lesions induced by apoxia on newborn babies through the fontanel.","PeriodicalId":6437,"journal":{"name":"2010 IEEE International Ultrasonics Symposium","volume":"62 1","pages":"1538-1541"},"PeriodicalIF":0.0,"publicationDate":"2010-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86369128","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 lossy compression scheme for pre-beamformer and post-beamformer ultrasound data","authors":"Mohamed M. Mansour, Murtaza Ali","doi":"10.1109/ULTSYM.2010.5935839","DOIUrl":"https://doi.org/10.1109/ULTSYM.2010.5935839","url":null,"abstract":"We present a framework for lossy compression of ultrasound RF data. The proposed scheme can be deployed either before or after the receiver beamformer. It performs a two-dimensional decorrelation in both the lateral and axial directions. The decorrelation in the lateral direction is done using a Karhun-loeve like transform, e.g., DCT or Hadamard. The decorrelation in the axial direction is done using customized orthogonal wavelet packets that are optimized for a particular ultrasound probe. The effectiveness of the compression algorithm for both pre-beamformer and post-beamformer compression is established by evaluating the performance on a set of simulated ultrasound signals.","PeriodicalId":6437,"journal":{"name":"2010 IEEE International Ultrasonics Symposium","volume":"15 1","pages":"2299-2302"},"PeriodicalIF":0.0,"publicationDate":"2010-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86533297","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":"Experimental verification and characterization of sub-harmonic traveling wave on an ultrasonic micromotor","authors":"S. Tin, M. Pandey, A. Lal","doi":"10.1109/ULTSYM.2010.5935569","DOIUrl":"https://doi.org/10.1109/ULTSYM.2010.5935569","url":null,"abstract":"In this paper, we studied the nonlinear subharmonic traveling resonant modes which generate the rotational motion on the surface-macromahcined ultrasonic micromotors. Actuated by a die-attached PZT plate, when the resonant frequency of the one of the stator's vibration mode is close to PZT plate's thickness mode resonance (∼4.2MHz), rotating wave is generated on the stator. Driven at 3.78MHz, the rotating wave on the stator with 820μm diameter is optically detected and spatially characterized with an optical microscope. Together with laser interferometer measurements, two subharmonic modes are obtained, (1, 13) traveling mode at 1.78MHz and (0, 20) standing mode at 2MHz. The experimental results are further verified with finite element simulation. The traveling wave is acoustically coupled to the rotor without sliding to generate motor rotation. To study motor rotation control, signal bursts with various number of cycles are applied to the motor, and rotation rate of 2 degree per thousand cycles with angular control of as little as 0.1 degree is achieved.","PeriodicalId":6437,"journal":{"name":"2010 IEEE International Ultrasonics Symposium","volume":"75 1","pages":"1841-1844"},"PeriodicalIF":0.0,"publicationDate":"2010-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90333570","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":"rtCAB: A tool for reducing unnecessary prostate biopsy cores","authors":"N. Testoni, S. Maggio, Francesca Galluzzo, L. De Marchi, N. Speciale","doi":"10.1109/ULTSYM.2010.5935788","DOIUrl":"https://doi.org/10.1109/ULTSYM.2010.5935788","url":null,"abstract":"With more than 110.000 new cases/year in Europe, prostate cancer (PCa) is one of the most frequent neoplasy. When suspects arise from standard diagnostic methods (i.e. Digital Rectal Exam, Transrectal Ultrasonography (TRUS), PSA level) a prostate biopsy (PBx) is mandatory. As patient discomfort and adverse event probability both grows with core number, it is desirable to reduce the number of PBx cores without negative impinging on diagnose accuracy. The work describes an innovative processing technique called real-time Computer Aided Biopsy (rtCAB) which enhances TRUS video stream with a false color overlay image, and suggests the physician where to sample thus reducing the total number of cores. Our proposal consists in a real-time non-linear classifier which processes the output of an original Maximum Likelihood estimator of Nakagami parameters based on Pade´ Approximant. The resulting algorithm, implemented making full use of CUDA parallel processing capabilities, is capable to deliver frame rates as high as 30 fps. Classification model was trained on a prostate gland adenocarcinoma database (400 PBx cores, 8000 ROIs). Ground truth for each core was established by an expert physician, providing tissue description and illness percentage for each core. The system was tuned for reducing the number of false positives while preserving an acceptable number of false negatives. Comparing to a classical double sextant PBx, the positive prediction value (PPV) of our method is 65% better, with an overall sensitivity of 100%.","PeriodicalId":6437,"journal":{"name":"2010 IEEE International Ultrasonics Symposium","volume":"7 1","pages":"49-52"},"PeriodicalIF":0.0,"publicationDate":"2010-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88858732","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":"Monospectral photoacoustic imaging using Legendre sequences","authors":"M. Beckmann, C. Friedrich, M. Mienkina, N. Gerhardt, M. Hofmann, G. Schmitz","doi":"10.1109/ULTSYM.2010.5935648","DOIUrl":"https://doi.org/10.1109/ULTSYM.2010.5935648","url":null,"abstract":"Photoacoustic (PA) imaging is an imaging modality based on the generation of ultrasound using laser irradiation. Pulsed laser diodes are an attractive alternative to Q-switched Nd:YAG lasers since they are cheaper and handier. As acoustic time-of-flight limits the pulse repetition frequency (PRF) for averaging, photoacoustic coded excitation (PACE) can be used to enhance the diodes' low signal to noise ratio (SNR). Strategies exhibiting range side lobes can yield higher SNR than previously proposed perfect methods while using simpler code sending procedures. Here, we examine the performance of Legendre sequences (LGS) for PACE. The gain in SNR compared to time equivalent averaging (coding gain) is derived as a function of code length and verified experimentally. The main lobe to peak side lobe ratio (MPSR) of the codes' autocorrelation functions is used to quantify the artifacts introduced by the codes' range side lobes. The coding gain is asymptotically equal to that of previously proposed methods, such as Golay codes (GC) or Simplex codes (SC). For finite code sending time, it exceeds the gain of GC and SC. For a PRF of 500 kHz and an imaging depth of 4.5 cm, the coding gain ranges from about 2 dB (11 bit sequence) to about 5.8 dB (547 bit sequence). Range side lobes are introduced but remain invisible for sufficiently large code lengths, which are necessary for practical applications.","PeriodicalId":6437,"journal":{"name":"2010 IEEE International Ultrasonics Symposium","volume":"1 1","pages":"386-389"},"PeriodicalIF":0.0,"publicationDate":"2010-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88919596","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":"Future integration of silicon electronics with miniature piezoelectric ultrasonic transducers and arrays","authors":"S. Cochran, A. Bernassau, D. Cumming, C. Démoré, M. Desmulliez, J. Sweet","doi":"10.1109/ULTSYM.2010.5935950","DOIUrl":"https://doi.org/10.1109/ULTSYM.2010.5935950","url":null,"abstract":"The long-established pace of progress in semiconductor electronics, expressed by Moore's Law, has led to new opportunities in medical ultrasound imaging. Traditionally, ultrasound systems have separated the transducer array from most of the electronic instrumentation, with multicore physical cabling in between. This avoids problems with electrical power, functional density, and communication bandwidth. However, it is far from ideal in terms of cost, ergonomics, and the need to interface instrumentation and the transducer with the cable, and it causes particular difficulties with miniature devices. Given these issues, and the relatively slow progress in front-end transducer technology, integration of the transducer with electronics is certain to increase, most likely at a pace governed by financial investment, development of electronics for other applications, and the realisation of high volume ultrasound applications. This paper therefore considers motivations for increased integration, technical barriers, and relevant new techniques, particularly related to microelectromechanical systems (MEMS). Increased integration will rely on advances in integrated circuit (IC) electronics, device assembly, and microsystems engineering, with key constraints being the packaging of a system in a small volume and the power supply. System partitioning will determine where functionality will reside physically within the imaging hardware and software. This paper considers relevant recent developments in academic research and industry, with a particular focus on medical applications. IC design is important because it defines parameters such as power consumption. 45 nm ICs are now in high volume production but the present relatively small ultrasound market makes adoption difficult. Ingenuity in exploiting existing technology cost-effectively and bespoke engineering where required are likely to be important for integration of piezoelectric material with electronics technology and functionality will correspond with different layers in a device. In this paper, examples are selected from the authors' work to illustrate progress and suggest how MEMS roadmaps and application demands may relate to future systems.","PeriodicalId":6437,"journal":{"name":"2010 IEEE International Ultrasonics Symposium","volume":"13 1","pages":"1108-1116"},"PeriodicalIF":0.0,"publicationDate":"2010-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83049813","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}