1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118)最新文献_第10页

Operation of a SAW reflection grating at harmonic frequencies SAW反射光栅在谐波频率下的工作

1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118) Pub Date : 1997-10-05 DOI: 10.1109/ULTSYM.1997.662969

C. Campbell, P.J. Edmondson

引用次数: 1

Two-directional phase aberration correction using a two-dimensional array 二维阵列双向相位像差校正

1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118) Pub Date : 1997-10-05 DOI: 10.1109/ULTSYM.1997.663346

Y. Miwa, R. Shinomura

引用次数: 7

Acoustic wave propagation: 2D Wigner and 3D wavefront simulations 声波传播:二维维格纳和三维波前模拟

1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118) Pub Date : 1997-10-05 DOI: 10.1109/ULTSYM.1997.662998

J. Salo, K. Bjorknas, J. Fagerholm, A. Friberg, M.M. Salmaa

引用次数: 4

Equivalent four-port networks for series connected SAW-IDT and their application 串联SAW-IDT等效四端口网络及其应用

1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118) Pub Date : 1997-10-05 DOI: 10.1109/ULTSYM.1997.662978

T. Kojima, N. Kawai, H. Obara

引用次数: 5

Design of Love wave sensor devices for the operation in liquid environments 液体环境下Love波传感器装置的设计

1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118) Pub Date : 1997-10-05 DOI: 10.1109/ULTSYM.1997.663043

B. Jakoby, A. Venema, M. Vellekoop

引用次数: 14

Acoustic gas sensor for extreme process conditions 用于极端工艺条件的声学气体传感器

1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118) Pub Date : 1997-10-05 DOI: 10.1109/ULTSYM.1997.663059

L. Zipser

引用次数: 4

Spatial quadrature: a novel technique for multi-dimensional velocity estimation 空间正交:一种新的多维速度估计技术

1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118) Pub Date : 1997-10-05 DOI: 10.1109/ULTSYM.1997.661801

M.E. Anderson

{"title":"Spatial quadrature: a novel technique for multi-dimensional velocity estimation","authors":"M.E. Anderson","doi":"10.1109/ULTSYM.1997.661801","DOIUrl":"https://doi.org/10.1109/ULTSYM.1997.661801","url":null,"abstract":"Conventional ultrasonic motion or flow velocity estimation is limited to the axial velocity component. I present a novel technique, called \"spatial quadrature\", for the simultaneous estimation of axial and lateral velocity components. This technique utilizes even and odd spatial weightings of the point spread function which have a quadrature relationship. These weightings produce modulation in the received echo which can be decoded to quantify lateral motion. This technique is conceptually related to both the multiple beam and spectral broadening paradigms for the estimation of the lateral velocity component. However, it also has unique characteristics which overcome some of the limitations of these previously described techniques. This estimator can be implemented for two-dimensional velocity estimation with a conventional transducer array and any medical ultrasound scanner, preferably one with parallel receive processing. The technique can also be extended to three-dimensional velocity estimation given an appropriate 2-D transducer and scanner. I present space and frequency domain descriptions of this estimator in the context of a brief overview of 2-D flow estimation methods, including analyses characterizing the performance envelope of this estimator. I also present the results of phantom studies using a clinical scanner which demonstrate this technique in two dimensions. I also discuss the application of this technique in CW and PW regimes.","PeriodicalId":6369,"journal":{"name":"1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1997-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88678330","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: 38

Dependence of photostriction on sample thickness and surface roughness for PLZT ceramics PLZT陶瓷的光致伸缩与样品厚度和表面粗糙度的关系

1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118) Pub Date : 1997-10-05 DOI: 10.1109/ULTSYM.1997.663082

P. Poosanaas, A. Dogan, S. Thakoor, K. Uchino

引用次数: 3

Variables controlling ultrasound contrast generation in the urinary bladder: a urinary reflux diagnosis 控制膀胱超声造影剂产生的变量:尿反流诊断

1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118) Pub Date : 1997-10-05 DOI: 10.1109/ULTSYM.1997.661790

E. Y. Hwang, J. Fowlkes, D. Sirkin, P. Carson

{"title":"Variables controlling ultrasound contrast generation in the urinary bladder: a urinary reflux diagnosis","authors":"E. Y. Hwang, J. Fowlkes, D. Sirkin, P. Carson","doi":"10.1109/ULTSYM.1997.661790","DOIUrl":"https://doi.org/10.1109/ULTSYM.1997.661790","url":null,"abstract":"An ultrasound system has been developed to generate contrast microbubbles in vivo. Possible uses include diagnosis of reflux in the urinary tract. In vivo and in vitro experiments were designed to elucidate the microbubble generation process using 1.8 MHz acoustic bursts at 125 ms. In in vivo experiments on rabbits, the peak rarefactional pressure threshold for contrast generation, as visualized with a diagnostic ultrasound system, decreased with increasing pCO/sub 2/. For the in vitro aqueous studies the threshold decreased almost a factor of two for increasing particle concentration (0.2 /spl mu/m dia. polystyrene) from 10/sup 8/ to 10/sup 10/ particles/cc. The thresholds were at least twice as high for more saturated fluids, and CO/sub 2/ samples had considerably lower thresholds than respective under-saturations in air. At a fixed pressure amplitude, echogenicity tended to increase with both increasing particle and gas content; this was more pronounced for samples containing CO/sub 2/. Even in a restricted-nuclei environment such as the human urinary bladder, generation of vaporous cavitation should be possible; however subsequently, abundant gas is needed to grow vaporous bubbles to persistent and imageable sizes, to assist in the diagnosis of urinary reflux.","PeriodicalId":6369,"journal":{"name":"1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1997-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82536348","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

Comparison between xanthene and Albunex on producing sonodynamic tissue damage 黄原烯与黄原烯对声动力组织损伤的比较

1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118) Pub Date : 1997-10-05 DOI: 10.1109/ULTSYM.1997.661825

S. Umemura, K. Kawabata, K. Sasaki

{"title":"Comparison between xanthene and Albunex on producing sonodynamic tissue damage","authors":"S. Umemura, K. Kawabata, K. Sasaki","doi":"10.1109/ULTSYM.1997.661825","DOIUrl":"https://doi.org/10.1109/ULTSYM.1997.661825","url":null,"abstract":"The authors' recent in vitro and in vivo experiments demonstrated that sonodynamically active cavitation was induced at low ultrasonic intensity in the presence of a certain chemical agent especially when the second harmonic was superimposed onto the fundamental. Chemical agents such as xanthene derivatives were found to be extremely effective. It has also been reported that microbubble contrast agents such as Albunex can enhance in vivo as well as in vitro cavitation. The effects of Albunex and erythrosin on the intensity threshold for cavitationally producing focal damage in murine liver tissue are compared and examined in a progressive wave mode. Albunex reduced the intensity threshold by orders of magnitude even in the case of single frequency insonation. Second-harmonic superimposition (SHS) did not significantly change the threshold with Albunex. Erythrosin and its derivative were quite effective to reduced the intensity threshold especially in combination with SHS at the second-harmonic phase emphasizing the peak rarefaction. The observed difference between the effects of Albunex and erythrosin in combination with SHS is consistent with the hypothesis that SHS enhances cavitational effects through accelerating the growth of microbubbles rather than their collapse.","PeriodicalId":6369,"journal":{"name":"1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1997-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83002250","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