2012 IEEE International Ultrasonics Symposium最新文献_第10页

Development of flow characterization system using ultrasonic methods 超声波流动表征系统的研制

2012 IEEE International Ultrasonics Symposium Pub Date : 2012-10-01 DOI: 10.1109/ULTSYM.2012.0363

H. Schwartz, J. Pineau, G. Feuillard, C. Prax, J. Valière

引用次数: 0

Polycrystalline PZT film on porous Ti substrate synthesized by Ultrasonic Assisted Hydrothermal Method 超声辅助水热法制备多孔钛基多晶PZT薄膜

2012 IEEE International Ultrasonics Symposium Pub Date : 2012-10-01 DOI: 10.1109/ULTSYM.2012.0046

Kanako Ohtal, Gaku Isobel, P. Bornmann, T. Hemsel, T. Morita

引用次数: 0

Feasibility study of blood velocity vector estimation using three types of transducer 三种换能器血液速度矢量估计的可行性研究

2012 IEEE International Ultrasonics Symposium Pub Date : 2012-10-01 DOI: 10.1109/ULTSYM.2012.0085

Hyungjoon Lim, Hwan Shim, Youngtae Kim, B. Cheon

{"title":"Feasibility study of blood velocity vector estimation using three types of transducer","authors":"Hyungjoon Lim, Hwan Shim, Youngtae Kim, B. Cheon","doi":"10.1109/ULTSYM.2012.0085","DOIUrl":"https://doi.org/10.1109/ULTSYM.2012.0085","url":null,"abstract":"Ultrasound color Doppler imaging has been a useful technique for obtaining vascular blood flow information. The conventional method, however, suffers from angle dependency when the blood flow is normal to the ultrasound beam direction so that it is difficult to visualize the blood flow. To overcome this angle dependency, various vector Doppler imaging methods with multiple transmit and receive sub-apertures have been proposed and showed an angle independent vessel flow information. However, most of them are evaluated on a linear array transducer. This paper evaluates a vector Doppler algorithm consisting of one transmit (TX) sub-aperture and two receive (RX) sub-apertures based on the convex and phased array transducer. Vessel flow velocity magnitudes and directions obtained by the vector Doppler using the convex and phased array show, for convex transducer mean direction error of 8.6843 degrees and 0.3860 m/s of mean velocity magnitude error and for phased array 16.1693 degrees and 0.0247 m/s mean errors respectively. These result indicate that convex and phased array also provide an reasonable vessel velocity magnitude and flow direction comparing to the vessel information of linear transducer which are errors of 2.9440 degrees and 0.1710 m/s respectively.","PeriodicalId":150948,"journal":{"name":"2012 IEEE International Ultrasonics Symposium","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128005468","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}

引用次数: 0

The design of a high speed receiver system for an ultrasound array research platform 超声阵列研究平台高速接收系统的设计

2012 IEEE International Ultrasonics Symposium Pub Date : 2012-10-01 DOI: 10.1109/ULTSYM.2012.0370

Charles A. Winckler, Peter R. Smith, D. Cowell, O. Olagunju, S. Freear

{"title":"The design of a high speed receiver system for an ultrasound array research platform","authors":"Charles A. Winckler, Peter R. Smith, D. Cowell, O. Olagunju, S. Freear","doi":"10.1109/ULTSYM.2012.0370","DOIUrl":"https://doi.org/10.1109/ULTSYM.2012.0370","url":null,"abstract":"Integrated analog front ends (AFEs) are often the preferred choice when designing ultrasound systems. They are convenient, easy to use packages, however do not yet provide the performance needed for high-frequency, wide-bandwidth ultrasound applications e.g. Pre-clinical imaging. These applications require higher sampling frequencies and increased levels of gain than are currently available in commercial AFEs. For high frequency systems it is therefore necessary to design a custom high-frequency AFE. This work reports on a scalable AFE design suited to wide-bandwidth applications. The AFE design is composed of a transmit/receive switch (TX810), a 43.5 dB low noise amplifier (AD8334), channel multiplexer (AD8184), a variable gain amplifier suitable for time gain compensation (THS7530), and a passive filter(9th order Chebyshev). The performance of the AFE design is verified in SPICE and measured using a network analyzer. Results show a 65 MHz -3 dB input bandwidth with an overall gain of 75 dB, smooth phase response and a minimal detectable voltage of 65 μV. The scalable design is suitable for replication across many channels of an imaging system, and has been designed to interface with the existing UARP system (University of Leeds, UK).","PeriodicalId":150948,"journal":{"name":"2012 IEEE International Ultrasonics Symposium","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128073496","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}

引用次数: 7

Volume flow assessment through simultaneous B-mode and Multigate Doppler 同时通过b -模式和多门多普勒评估容积流量

2012 IEEE International Ultrasonics Symposium Pub Date : 2012-10-01 DOI: 10.1109/ULTSYM.2012.0397

S. Ricci, M. Cinthio, M. Lenge, R. Matera, J. Albinsson, P. Tortoli

{"title":"Volume flow assessment through simultaneous B-mode and Multigate Doppler","authors":"S. Ricci, M. Cinthio, M. Lenge, R. Matera, J. Albinsson, P. Tortoli","doi":"10.1109/ULTSYM.2012.0397","DOIUrl":"https://doi.org/10.1109/ULTSYM.2012.0397","url":null,"abstract":"The typical approach for volumetric blood flow assessment consists of a velocity measurement performed in a single sample volume placed in the vessel centre, combined to an estimate of the average diameter. This simple approach produces large inaccuracies since it does not account for the complex flow configurations produced by complicated artery geometries and/or pulsatile conditions. Moreover, diameter changes, which in important regions like the common carotid artery can be larger than 10%, are totally neglected. In this work we propose an alternative volume flow method which overcomes some of the aforementioned limitations through the simultaneous measurement of the wall positions and of the velocity distribution in the artery. The wall positions are tracked by a detector based on the First Order Absolute Moment working on B-mode data, while the velocity profile is obtained by a Multigate Spectral Doppler analysis applied to PW-mode data. The method was implemented on the ULA-OP research system and validated on a flow phantom with more than 1700 experiments performed in rigid and flexible pipes. We found a systematic underestimation of 3.7% with 5.0% standard deviation. The mean coefficient of variation (CV) was 1.7%.","PeriodicalId":150948,"journal":{"name":"2012 IEEE International Ultrasonics Symposium","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125712891","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}

引用次数: 1

Determination method of acoustical physical constants and their temperature coefficients of La3Ta0.5Ga5.3Al0.2O14 single crystal la3ta0.5 ga5.3 al0.2 2o14单晶声物理常数及其温度系数的测定方法

2012 IEEE International Ultrasonics Symposium Pub Date : 2012-10-01 DOI: 10.1109/ULTSYM.2012.0686

Y. Ohashi, Hitoshi Yoshida, M. Arakawa, J. Kushibiki, Tomoaki Karakai, Tao Lv, M. Adachi

{"title":"Determination method of acoustical physical constants and their temperature coefficients of La3Ta0.5Ga5.3Al0.2O14 single crystal","authors":"Y. Ohashi, Hitoshi Yoshida, M. Arakawa, J. Kushibiki, Tomoaki Karakai, Tao Lv, M. Adachi","doi":"10.1109/ULTSYM.2012.0686","DOIUrl":"https://doi.org/10.1109/ULTSYM.2012.0686","url":null,"abstract":"A determination method of accurate acoustical physical constants and their temperature coefficients was demonstrated for La3Ta0.5Ga5.3Al0.2O14 (L TGA) single crystal using the ultrasonic microspectroscopy (UMS) technology combined with the resonance method. Several specimens (X-, Y-, Z-, 29.14°Y-, and 150.86°Y-cut) were prepared from an LTGA ingot. Acoustical physical constants and their temperature coefficients around room temperatures were determined using the longitudinal- and shear-wave velocities measured by the UMS system, dielectric constants, density, and thermal expansion coefficients. Measured leaky surface acoustic wave (LSA W) velocities and calculated ones using the determined constants at 23°C were compared, resulting in good agreement within -3.0 to 1.1 m/s for all propagation directions. Using four X-cut rotated Y-bar (-30°Y, 0°Y, 15°Y, 30°Y) specimens and Y-cut specimen prepared from the same ingot, the temperature coefficients in a range from -30 to 80°C were also obtained by the resonance method. Combining the temperature coefficients obtained by the resonance method with the accurate constants obtained by the UMS technology, we can determine more reliable constants and temperature coefficients.","PeriodicalId":150948,"journal":{"name":"2012 IEEE International Ultrasonics Symposium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125844818","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}

引用次数: 3

Ultrasound tissue motion assessment using full correlation analysis 超声组织运动评估采用全相关分析

2012 IEEE International Ultrasonics Symposium Pub Date : 2012-10-01 DOI: 10.1109/ULTSYM.2012.0642

H. Taki, T. Sakamoto, M. Yamakawa, T. Shiina, Toru Sato

引用次数: 1

Robust change detection in highly dynamic guided wave signals with singular value decomposition 基于奇异值分解的高动态导波信号鲁棒变化检测

2012 IEEE International Ultrasonics Symposium Pub Date : 2012-10-01 DOI: 10.1109/ULTSYM.2012.0120

Chang Liu, J. Harley, Nicholas O'Donoughue, Yujie Ying, Martin H. Altschul, M. Berges, J. Garrett, D. Greve, José M. F. Moura, I. Oppenheim, L. Soibelman

引用次数: 16

Effect of myocardial perfusion on end-systolic radial strain at the apex 心肌灌注对收缩末期心尖径向应变的影响

2012 IEEE International Ultrasonics Symposium Pub Date : 2012-10-01 DOI: 10.1109/ULTSYM.2012.0272

Thuy Nguyen, A. Espinoza, S. Hyler, E. Remme, J. Dhooge, L. Hoff

{"title":"Effect of myocardial perfusion on end-systolic radial strain at the apex","authors":"Thuy Nguyen, A. Espinoza, S. Hyler, E. Remme, J. Dhooge, L. Hoff","doi":"10.1109/ULTSYM.2012.0272","DOIUrl":"https://doi.org/10.1109/ULTSYM.2012.0272","url":null,"abstract":"According to the literature, subendocardial strain is more susceptible to reduced perfusion than mid-myocardial and sub-epicardial strains. The aim of this study was to compare radial strain in these 3 layers under various levels of flow reduction, using our previously described system with miniature high-frequency transducers sutured to the epicardial surface. The blood flow in the left anterior descending coronary artery (LAD) was controlled under three flow conditions: no flow reduction, 25% flow reduction and 75% flow reduction. The myocardial wall was divided into 3 equally sized layers. Tissue velocities were estimated from the RF signals using a phase shift Doppler estimator, finding the average phase shift between 3 successive RF lines. A 4th order Butterworth filter was applied to the velocity estimates in both temporal and spatial directions, and radial strain rate and strain were calculated. The results showed that strain decreased by 16.4±7.2% in the sub-endocardium, while it decreased by 7.9±4.9% and 7.7±6.8%, respectively, in the mid- and sub-epicardial layers at 25% flow reduction. At 75% flow reduction, the strain was reduced by 28.1±7.7% compared to baseline in the sub-endocardial and mid-layers, while it was reduced by a similar amount in the mid-myocardium and subepicardium, 26.9±6.5% and 26.8±10.7%, respectively.","PeriodicalId":150948,"journal":{"name":"2012 IEEE International Ultrasonics Symposium","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127917391","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}

引用次数: 2

Acoustic energy driven focus-tunable liquid microlens array for Shack-Hartmann wavefront sensor application 声能驱动聚焦可调液体微透镜阵列在Shack-Hartmann波前传感器中的应用

2012 IEEE International Ultrasonics Symposium Pub Date : 2012-10-01 DOI: 10.1109/ULTSYM.2012.0281

G. Feng, Jun-Ho Liu

引用次数: 0