1999 IEEE Ultrasonics Symposium. Proceedings. International Symposium (Cat. No.99CH37027)最新文献_第2页

Modeling of horns for sonic/ultrasonic applications 用于声波/超声波应用的喇叭建模

1999 IEEE Ultrasonics Symposium. Proceedings. International Symposium (Cat. No.99CH37027) Pub Date : 1999-10-19 DOI: 10.1109/ULTSYM.1999.849482

S. Sherrit, B. Dolgin, Y. Bar-Cohen, D. Pal, J. Kroh, Tom Peterson Cybersonics

{"title":"Modeling of horns for sonic/ultrasonic applications","authors":"S. Sherrit, B. Dolgin, Y. Bar-Cohen, D. Pal, J. Kroh, Tom Peterson Cybersonics","doi":"10.1109/ULTSYM.1999.849482","DOIUrl":"https://doi.org/10.1109/ULTSYM.1999.849482","url":null,"abstract":"JPL has a requirement for telerobotic tools for planetary sample acquisition, which require low power and have the ability to work in harsh environments. We are currently investigating the possibility of using ultrasonic horns to develop a family of ultrasonic tools for these environments. In an effort to determine control parameters a one-dimensional Mason's model for a stepped ultrasonic horn assembly was developed which includes the effects of mechanical and electrical losses in the piezoelectric material and acoustic elements. The model is separated into three regions; the piezoelectric stack including stress bolt, the backing layer and the horn. The model is found to predict the impedance data of the horn assembly very accurately up to the first coupled (radial) resonance. The model also allows for the calculation of the velocity and force and power delivered to each acoustic element. FEM modeling and accelerometer data from the horn tip were used to corroborate the model. The difficulties associated with modeling the load impedance of various devices will be discussed and current directions noted.","PeriodicalId":339424,"journal":{"name":"1999 IEEE Ultrasonics Symposium. Proceedings. International Symposium (Cat. No.99CH37027)","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134348290","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: 78

Real-time evaluation of transient response of arterial wall elasticity to administration of nitroglycerine 硝酸甘油对动脉壁弹性瞬态反应的实时评价

1999 IEEE Ultrasonics Symposium. Proceedings. International Symposium (Cat. No.99CH37027) Pub Date : 1999-10-17 DOI: 10.1109/ULTSYM.1999.849290

H. Kanai, Y. Koiwa

{"title":"Real-time evaluation of transient response of arterial wall elasticity to administration of nitroglycerine","authors":"H. Kanai, Y. Koiwa","doi":"10.1109/ULTSYM.1999.849290","DOIUrl":"https://doi.org/10.1109/ULTSYM.1999.849290","url":null,"abstract":"The authors previously (1996, 1997) developed a new method, the phased tracking method, for accurately tracking the movement of the heart wall and arterial wall based on both the phase and magnitude of the demodulated signals to determine the instantaneous position of an object. With this method, the local change in wall thickness during one heartbeat can be determined. They have now developed a real-time system for continuously measuring the change in thickness of the myocardium and arterial wall. In this system, four high-speed digital signal processing chips are employed for realizing the initially developed method in real time. The tracking results for both sides of the wall are superimposed on the M (motion)-mode image. The change in thickness of the arterial wall as small as several micrometers can be successfully detected in real time with good reproducibility. The elasticity of the arterial wall is derived from the blood pressure. In in vivo experiments, the rapid response of the change in wall thickness of the carotid artery to the administration of nitroglycerine (NTG) is evaluated for a young healthy subject and a young smoker. When the change in thickness is plotted against the simultaneously measured pressure, such curves also change due to the administration of NTG. This is shown every 35 seconds after the administration. This new real-time system offers potential for quantitative diagnosis of early-stage atherosclerosis by evaluation of the rapid response of the cardiovascular system to NTG.","PeriodicalId":339424,"journal":{"name":"1999 IEEE Ultrasonics Symposium. Proceedings. International Symposium (Cat. No.99CH37027)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115487603","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

Effects of beam asymmetry on ultrasonic thermal lesions 光束不对称对超声热损伤的影响

1999 IEEE Ultrasonics Symposium. Proceedings. International Symposium (Cat. No.99CH37027) Pub Date : 1999-10-17 DOI: 10.1109/ULTSYM.1999.849263

F. Lizzi, C. Deng, D. Coleman, R. Silverman, R. Bernardi, C. Vecchio

引用次数: 2

Calculating multimode generation in BAW transducers and resonators BAW换能器和谐振器中多模产生的计算

1999 IEEE Ultrasonics Symposium. Proceedings. International Symposium (Cat. No.99CH37027) Pub Date : 1999-10-17 DOI: 10.1109/ULTSYM.1999.849131

E. Adler

{"title":"Calculating multimode generation in BAW transducers and resonators","authors":"E. Adler","doi":"10.1109/ULTSYM.1999.849131","DOIUrl":"https://doi.org/10.1109/ULTSYM.1999.849131","url":null,"abstract":"A matrix method is given for calculating the frequency responses for the excitation amplitudes of the three acoustic modes in transducer-substrate geometries and in resonators. The effectiveness of the method is illustrated for typical resonator and transducer structures. Transducers and resonators can be multilayer; viscosity are taken into account. A bulk-acoustic-wave transducer used to excite one of the three bulk modes of a substrate material to which it is coupled is equivalent to a mechanically loaded resonator. In practice all three acoustic bulk modes get generated due to orientation tolerances in transducer and substrate cuts and alignment errors with respect to the substrate. The matrix method for finding the acoustic mode amplitudes in transducers or resonator geometries allows an explicit calculation of: 1. The electrical driving point impedance, insertion loss, and scattering coefficients; 2. The electrical power supplied by the source; 3. The amplitudes of the three bulk modes excited in the substrate; 4. The total acoustic power and the power for each mode in the substrate. These quantities are calculated as a function of frequency using formulas which follow directly from the electrical and mechanical boundary condition matrix equations for the structure. The computation uses only the orientations and thicknesses of the materials, their thermodynamic constants, and the device area.","PeriodicalId":339424,"journal":{"name":"1999 IEEE Ultrasonics Symposium. Proceedings. International Symposium (Cat. No.99CH37027)","volume":"464 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123052677","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

Measurement of ultrasonic velocity in viscoelastic materials using the wavelet transform 用小波变换测量粘弹性材料中的超声速度

1999 IEEE Ultrasonics Symposium. Proceedings. International Symposium (Cat. No.99CH37027) Pub Date : 1999-10-17 DOI: 10.1109/ULTSYM.1999.849524

E. Moreno, F. García, M. Castillo

引用次数: 3

A low loss CDMA-IF filter based on RSPUDT on LBO substrate LBO基板上基于RSPUDT的低损耗CDMA-IF滤波器

1999 IEEE Ultrasonics Symposium. Proceedings. International Symposium (Cat. No.99CH37027) Pub Date : 1999-10-17 DOI: 10.1109/ULTSYM.1999.849417

S. Ichikawa, S. Mitobe, M. Koshino, Y. Ebata

引用次数: 5

Finite element analysis of radiation force induced tissue motion with experimental validation 辐射力诱导组织运动的有限元分析及实验验证

1999 IEEE Ultrasonics Symposium. Proceedings. International Symposium (Cat. No.99CH37027) Pub Date : 1999-10-17 DOI: 10.1109/ULTSYM.1999.849240

K. Nightingale, R. Nightingale, M. Palmeri, G. Trahey

{"title":"Finite element analysis of radiation force induced tissue motion with experimental validation","authors":"K. Nightingale, R. Nightingale, M. Palmeri, G. Trahey","doi":"10.1109/ULTSYM.1999.849240","DOIUrl":"https://doi.org/10.1109/ULTSYM.1999.849240","url":null,"abstract":"An ultrasonic radiation force-based method for remote palpation of tissue is investigated. The use of radiation force to image tissue stiffness has been proposed by several researchers. In this paper, the potential for using a diagnostic ultrasound system to both apply radiation force and track the resulting tissue displacements is investigated using Finite Element Methods (FEM), and the results are compared with experimental results. Remote palpation is accomplished by interspersing high intensity pushing beams with low intensity tracking beams. This generates localized radiation forces which can be applied throughout the tissue, with the resulting displacement patterns determined using correlation techniques. An area that is stiffer than the surrounding medium distributes the force, resulting in larger regions of displacement, and smaller maximum displacements. The resulting displacement maps provide information as to the location and size of regions of increased stiffness. The authors have developed an FEM model that predicts displacements resulting from acoustic radiation force fields generated by diagnostic transducers in various complex media. They perform a parametric analysis of varying tissue and acoustic beam characteristics on radiation force induced tissue displacements. Displacements are on the order of microns, with considerable differences in displacement patterns in the presence and absence of a lesion (or stiff inclusion). Initial experimental results are presented that support the findings in the model.","PeriodicalId":339424,"journal":{"name":"1999 IEEE Ultrasonics Symposium. Proceedings. International Symposium (Cat. No.99CH37027)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117167220","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: 16

Intracardiac ultrasound catheter using a micromachine (MEMS) actuator 使用微型机械（MEMS）致动器的心内超声导管

1999 IEEE Ultrasonics Symposium. Proceedings. International Symposium (Cat. No.99CH37027) Pub Date : 1999-10-17 DOI: 10.1109/ULTSYM.1999.849206

J. Zara, S. Bobbio, S. Goodwin-Johansson, S.W. Smith

引用次数: 8

Poroelastography: estimating and imaging the poroelastic properties of tissues 孔隙弹性成像:组织孔隙弹性特性的估计和成像

1999 IEEE Ultrasonics Symposium. Proceedings. International Symposium (Cat. No.99CH37027) Pub Date : 1999-10-17 DOI: 10.1109/ULTSYM.1999.849307

E. Konofagou, T. Harrigan, J. Ophir, T. Krouskop

引用次数: 9

An accurate method for measuring complex acoustic impedance of biological tissues using an impedance transformer 一种利用阻抗互感器精确测量生物组织复杂声阻抗的方法

1999 IEEE Ultrasonics Symposium. Proceedings. International Symposium (Cat. No.99CH37027) Pub Date : 1999-10-17 DOI: 10.1109/ULTSYM.1999.849251

H. Takigawa, Y. Furumoto, R. Hatakeyama, N. Tagawa, T. Moriya

引用次数: 0