2002 IEEE Ultrasonics Symposium, 2002. Proceedings.最新文献_第6页

A new medical ultrasound research interface 一种新型医学超声研究界面

2002 IEEE Ultrasonics Symposium, 2002. Proceedings. Pub Date : 2002-10-08 DOI: 10.1109/ULTSYM.2002.1192593

L. Nock, S. Brunke, H. Jiang, J. J. Mai, G. Trahey, P. von Behren

引用次数: 8

On the mechanism of acoustic droplet vaporization 声液滴汽化机理研究

2002 IEEE Ultrasonics Symposium, 2002. Proceedings. Pub Date : 2002-10-08 DOI: 10.1109/ULTSYM.2002.1193459

O. Kripfgans, P. Carson, J. Fowlkes

{"title":"On the mechanism of acoustic droplet vaporization","authors":"O. Kripfgans, P. Carson, J. Fowlkes","doi":"10.1109/ULTSYM.2002.1193459","DOIUrl":"https://doi.org/10.1109/ULTSYM.2002.1193459","url":null,"abstract":"It has been observed in the past that micrometer sized droplets can be vaporized into gas bubbles by the application of diagnostic ultrasound. This paper will discuss the possible underlying mechanism of acoustic droplet vaporization (ADV) including acoustic cavitation, acoustic heating, shape oscillations during acoustic irradiation, and hydrodynamic cavitation. Experiments were performed on droplet emulsions as well as on single droplets. The vaporization of emulsions was quantified based on gas bubbles generated in a flow tube using a 10 MHz linear imaging army. Single droplets were monitored optically under a microscope and a high speed video system. The frequency dependence of ADV as well as trials with degassed water (40% of saturation) imply that acoustic cavitation is not the mechanism for ADV. Acoustic heating was investigated by exposing the droplet emulsion to repetitive tone bursts (50 Hz to 5 kHz). No significant change in pressure threshold for ADV was observed, however the yield of gas bubbles was used to calculate the single pulse conversion efficiency of ADV to 26%. Droplet shape oscillations causing a non-uniform Laplace pressure, were found to be 15% or less of the droplet diameter. They could be observed at the beginning and at the end of the acoustic irradiation. Observed was a dipole-type motion (1.3 /spl mu/m amplitude) of irradiated droplets as well as the spot-like onset of vaporization on the axis of oscillation close to a pole of the droplet. It is concluded that because of the high Reynolds number during ADV (4-5/spl times/10/sup 5/), the mechanism of vaporization might be based on hydrodynamic effects.","PeriodicalId":378705,"journal":{"name":"2002 IEEE Ultrasonics Symposium, 2002. Proceedings.","volume":"105 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127556797","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

Combination of finite element simulations and linear systems theory for pulse shaping of piezoelectric transducers used in therapy 基于有限元模拟和线性系统理论的治疗用压电换能器脉冲整形研究

2002 IEEE Ultrasonics Symposium, 2002. Proceedings. Pub Date : 2002-10-08 DOI: 10.1109/ULTSYM.2002.1192529

T. Dreyer, R.E. Riedlinger

引用次数: 1

Multi-band RF SAW filter for mobile phone using surface mount plastic package 手机多波段射频SAW滤波器采用表面贴装塑料封装

2002 IEEE Ultrasonics Symposium, 2002. Proceedings. Pub Date : 2002-10-08 DOI: 10.1109/ULTSYM.2002.1193365

Susumu Yoshimoto, Yasushi Yamamoto, Y. Takahashi, Eiichi Otsuka

{"title":"Multi-band RF SAW filter for mobile phone using surface mount plastic package","authors":"Susumu Yoshimoto, Yasushi Yamamoto, Y. Takahashi, Eiichi Otsuka","doi":"10.1109/ULTSYM.2002.1193365","DOIUrl":"https://doi.org/10.1109/ULTSYM.2002.1193365","url":null,"abstract":"In recent years, multi-band RF SAW filters for mobile phone are strongly required. In this work, as the example of multi-band SAW filters, we report PDC triple-band SAW filter and EGSM /DCS dual-band balanced SAW filter using surface mount plastic package. These filters are encapsulated in plastic package and they are made by our new plastic molding technology. The plastic package has advantages of lightweight low material cost and low assembly cost. To integrate plural filters to one chip, we refined the conventional lift-off method. The method can realize easy fabrication of SAW chip for multi-band filter We utilized 36Y-X LiTaO/sub 3/ for substrates for the filter. The electrode structure of each filter is longitudinal-mode resonator filter With regards to PDC triple-band filter, we achieved typical insertion loss of 2.0 dB / 2.1 dB / 2.2 dB with bandwidth of 33 MHz / 15 MHz / 24 MHz for 800 MHz (called CD-band) / 800 MHz (called A-band) / 1.5 GHz, respectively, with excellent high rejection levels. And for another application of the plastic package, we developed EGSM/DCS Rx dual-band balanced SAW filter. We achieved insertion loss of 2.2 dB / 3.0 dB for EGSM and DCS filter, respectively, with good amplitude and phase balance. We could realize multi-band SAW filters using the plastic package and could confirm its usability for SAW devices.","PeriodicalId":378705,"journal":{"name":"2002 IEEE Ultrasonics Symposium, 2002. Proceedings.","volume":"105 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133155460","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: 14

Advances in tissue-type imaging (TTI) for detecting and evaluating prostate cancer 前列腺癌组织型成像(TTI)检测与评价的研究进展

2002 IEEE Ultrasonics Symposium, 2002. Proceedings. Pub Date : 2002-10-08 DOI: 10.1109/ULTSYM.2002.1192551

E. Feleppa, S. Urban, A. Kalisz, C. R. Porter

引用次数: 6

Near-field phase shift photolithography for high-frequency SAW transducers 高频SAW换能器的近场相移光刻

2002 IEEE Ultrasonics Symposium, 2002. Proceedings. Pub Date : 2002-10-08 DOI: 10.1109/ULTSYM.2002.1193394

T. Hesjedal, W. Seidel, H. Kostial

{"title":"Near-field phase shift photolithography for high-frequency SAW transducers","authors":"T. Hesjedal, W. Seidel, H. Kostial","doi":"10.1109/ULTSYM.2002.1193394","DOIUrl":"https://doi.org/10.1109/ULTSYM.2002.1193394","url":null,"abstract":"Optical lithography has been widely used in mass production of various electronic devices, mainly because of its high throughput capability. However, the resolution in conventional lithography is diffraction limited. Cost issues, on the other hand, make slower but higher resolution methods, like electron beam lithography, unattractive for industrial applications. In order to be able to continue the use of optical lithography, new schemes were developed that enhance the resolution. Phase-shifting masks, for example, alter both the amplitude and the phase of the exposing light and lead to higher resolution. Using the related phase edge method it has been shown that 100 nm features can be produced using 248 nm light. Furthermore, employing an elastomeric phase mask, commercially available photo resist, and incoherent light, down to 90 nm features were demonstrated. Here, we report on the application of a near-field phase shift technique on the fabrication of SAW transducers. This simple and low cost technique is best suited for the fabrication of SAW structures, where the metallization ratio is different from 1:1, like Narrow Gap Floating Electrode Unidirectional Transducers (NG-FEUDTS).","PeriodicalId":378705,"journal":{"name":"2002 IEEE Ultrasonics Symposium, 2002. Proceedings.","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132754723","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: 5

SAFT imaging using immersed capacitive micromachined ultrasonic transducers 浸入式电容式微机械超声换能器的SAFT成像

2002 IEEE Ultrasonics Symposium, 2002. Proceedings. Pub Date : 2002-10-08 DOI: 10.1109/ULTSYM.2002.1192468

J. McIntosh, D. Hutchins, D. Billson, R. A. Noble, R. Davies, L. Koker

引用次数: 4

Aggregation of red cells and linear velocity gradients: influence on the correlation-based method for quantitative IVUS blood flow at 20 MHz 红细胞聚集和线速度梯度:对基于相关性方法的定量IVUS血流在20mhz的影响

2002 IEEE Ultrasonics Symposium, 2002. Proceedings. Pub Date : 2002-10-08 DOI: 10.1109/ULTSYM.2002.1192588

F. Lupotti, A. Zimmer, M. Daronat, F. Foster, A. V. D. van der Steen, G. Cloutier

引用次数: 1

Embedded inductors incorporated in the design of SAW module SMT packaging 嵌入式电感器集成在SAW模块的SMT封装设计中

2002 IEEE Ultrasonics Symposium, 2002. Proceedings. Pub Date : 2002-10-08 DOI: 10.1109/ULTSYM.2002.1193428

B. Potter, J. Mink, V. Narayanan

引用次数: 0

Thermoacoustic ultrasound power measurement using evaluation of transient temperature profiles 热声超声功率测量的瞬态温度分布评估

2002 IEEE Ultrasonics Symposium, 2002. Proceedings. Pub Date : 2002-10-08 DOI: 10.1109/ULTSYM.2002.1192557

V. Wilkens

引用次数: 9