2000 IEEE Ultrasonics Symposium. Proceedings. An International Symposium (Cat. No.00CH37121)最新文献

A novel region growing method for segmenting ultrasound images 一种新的超声图像分割区域生长方法

2000 IEEE Ultrasonics Symposium. Proceedings. An International Symposium (Cat. No.00CH37121) Pub Date : 2000-12-01 DOI: 10.1109/ULTSYM.2000.921653

X. Hao, Charles J Bruce, C. Pislaru, James F. Greenleaf

引用次数: 68

Lesion resolution following exposure of rat lung to pulsed ultrasound 脉冲超声对大鼠肺损伤的影响

2000 IEEE Ultrasonics Symposium. Proceedings. An International Symposium (Cat. No.00CH37121) Pub Date : 2000-12-01 DOI: 10.1109/ULTSYM.2000.921560

J. Zachary, L. Frizzell, W. O’Brien

{"title":"Lesion resolution following exposure of rat lung to pulsed ultrasound","authors":"J. Zachary, L. Frizzell, W. O’Brien","doi":"10.1109/ULTSYM.2000.921560","DOIUrl":"https://doi.org/10.1109/ULTSYM.2000.921560","url":null,"abstract":"Ultrasound has an exceptional safety record, but concerns have been raised by reports of clinical-level ultrasound-induced lung haemorrhage in mice, rats, rabbits, monkeys, and pigs. This study characterized the temporal reparative (healing) responses in lung following the induction of lesions by pulsed ultrasound (3.14 MHz, 1700-Hz PRF, 1.4-/spl mu/s pulse duration, 60-s exposure duration, in situ [at the pleural surface] peak rarefactional pressure of 17 MPa, and in situ peak compressional pressure of 39.7 MPa). Following exposure, lung lesions were evaluated at 0, 1, 2, 5, 7, 9, 12, 14, and 16 days post exposure (dpe). Lungs were scored for the presence of lesions, recorded digitally, and fixed in 10% formalin. After fixation, the dimensions of each lesion at the visceral pleural surface were measured. The lesions were bisected and the depth measured. The temporal changes were indicative of degradation of erythrocytes through processing and removal of hemoglobin and iron pigments. Microscopic lesions paralleled the gross lesions and reparative responses resulted in minimal alteration of lung structure. The reparative response in lung was analogous to reparative responses in soft tissues associated with bruising, but also had a proliferative phase characterized by focal hyperplasia of spindloid cells whose phenotypes need to be determined.","PeriodicalId":350384,"journal":{"name":"2000 IEEE Ultrasonics Symposium. Proceedings. An International Symposium (Cat. No.00CH37121)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122180491","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: 6

Analysis of temperature compensated SAW modes in ZnO/SiO/sub 2//Si multilayer structures ZnO/SiO/ sub2 /Si多层结构中温度补偿SAW模式的分析

2000 IEEE Ultrasonics Symposium. Proceedings. An International Symposium (Cat. No.00CH37121) Pub Date : 2000-12-01 DOI: 10.1109/ULTSYM.2000.922564

N. Emanetoglu, G. Patounakis, S. Muthukumar, Y. Lu

引用次数: 15

Thick film sol gel PZT transducer using dip coating 厚膜溶胶凝胶PZT传感器采用浸渍涂层

2000 IEEE Ultrasonics Symposium. Proceedings. An International Symposium (Cat. No.00CH37121) Pub Date : 2000-12-01 DOI: 10.1109/ULTSYM.2000.921488

K.L. Gentry, J. Zara, S. Bu, C. Eom, S.W. Smith

引用次数: 20

Differentiation of moving scatterers with different velocities using trapezoid filter and pulse echo ultrasound 用梯形滤波和脉冲回波超声鉴别不同速度的运动散射体

2000 IEEE Ultrasonics Symposium. Proceedings. An International Symposium (Cat. No.00CH37121) Pub Date : 2000-12-01 DOI: 10.1109/ULTSYM.2000.921604

Yi Zheng, Aiping Yao, J. Greenleaf

引用次数: 0

Towards ultrasonic brain imaging 走向超声脑成像

2000 IEEE Ultrasonics Symposium. Proceedings. An International Symposium (Cat. No.00CH37121) Pub Date : 2000-12-01 DOI: 10.1109/ULTSYM.2000.921635

J. Aubry, J. Gerber, M. Tanter, J. Thomas, M. Fink

引用次数: 1

ESR dosimetry of free radicals-a comparison between high intensity ultrasound fields and an ionizing Cs/sup 137/ source 自由基的ESR剂量测定——高强度超声场与电离Cs/sup 137源的比较

2000 IEEE Ultrasonics Symposium. Proceedings. An International Symposium (Cat. No.00CH37121) Pub Date : 2000-12-01 DOI: 10.1109/ULTSYM.2000.921575

J. Jenne, M. Moosmann, I. Simiantonakis, R. Rastert, P. Huber, M. Rheinwald, T. Haase, J. Debus

{"title":"ESR dosimetry of free radicals-a comparison between high intensity ultrasound fields and an ionizing Cs/sup 137/ source","authors":"J. Jenne, M. Moosmann, I. Simiantonakis, R. Rastert, P. Huber, M. Rheinwald, T. Haase, J. Debus","doi":"10.1109/ULTSYM.2000.921575","DOIUrl":"https://doi.org/10.1109/ULTSYM.2000.921575","url":null,"abstract":"High intensity ultrasound fields have the potential to produce free radicals in aqueous solutions caused by inertial cavitation. In this study we compared the production of free radicals under different sonication modalities with radical formation in the field of a well known Cs/sup 137/ gamma-ray source. In addition we examined the enhancement of radical production by photodynamic substances. Analysis of radical formation was performed with an ESR spectrometer. Sonication of aqueous test solution was carried out with high intensity focused ultrasound (HIFU) and with an unfocused ultrasound field in a standing wave mode against a solution/air interface. We were able to assess the quantity of free radicals developing in photon field as well as in US fields. It was feasible to determine equivalent dose values comparing ultrasound with photon irradiation. A significant enhancement of radical production by a photosensitizer was only detected in the unfocused ultrasound field in a standing wave mode.","PeriodicalId":350384,"journal":{"name":"2000 IEEE Ultrasonics Symposium. Proceedings. An International Symposium (Cat. No.00CH37121)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129803540","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

Role of pulse repetition frequency and exposure duration on the superthreshold behavior of ultrasound-induced lung haemorrhage in adult mice and rats 脉冲重复频率和暴露时间对超声诱发成年小鼠和大鼠肺出血超阈行为的影响

2000 IEEE Ultrasonics Symposium. Proceedings. An International Symposium (Cat. No.00CH37121) Pub Date : 2000-12-01 DOI: 10.1109/ULTSYM.2000.921559

W. O’Brien, L. Frizzell, D. Schaeffer, J. Zachary

{"title":"Role of pulse repetition frequency and exposure duration on the superthreshold behavior of ultrasound-induced lung haemorrhage in adult mice and rats","authors":"W. O’Brien, L. Frizzell, D. Schaeffer, J. Zachary","doi":"10.1109/ULTSYM.2000.921559","DOIUrl":"https://doi.org/10.1109/ULTSYM.2000.921559","url":null,"abstract":"Superthreshold behavior for ultrasound-induced lung haemorrhage was investigated in 150 mice and 150 rats at 2.8 MHz to assess the role of pulse repetition frequency (PRF) and exposure duration (ED). Each species was divided into 15 exposure groups (10 per group) for a 3/spl times/5 randomized factorial design (3 EDs of 5, 10 and 20 s; and 5 PRFs of 25, 50, 100, 250 and 500 Hz). The in situ peak rarefactional pressure (12.3 MPa) and pulse duration (1.42 /spl mu/s) were the same for all ultrasonically exposed animals. Also, for both species, 15 sham-exposed animals were randomized into both studies, none of which had lesions. Factorial analysis of variance was used to evaluate effects of PRF and ED on the proportion of lesions, lesion depth and lesion surface area. The proportion of lesions in both species was related statistically to PRF and ED, with the exception that PRF in rats was not quite significant. The PRF, but not ED, significantly affected lesion depth in both species. Both PRF and ED significantly affected lesion surface area in mice, while neither affected area in rats. The PRF/spl times/ED interaction (number of pulses) for these measures was not significant for either species. Species significantly affected lesion production and size; there were fewer lesions in mice, and the lesion size was greater in rats. The characteristics of the lesions produced in both species were similar to those described in studies by our research group and others, suggesting a common pathogenesis for the initiation and propagation of the lesions at the gross and microscopic levels.","PeriodicalId":350384,"journal":{"name":"2000 IEEE Ultrasonics Symposium. Proceedings. An International Symposium (Cat. No.00CH37121)","volume":"211 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123267709","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

An error analysis of Helmholtz inversion for incompressible shear, vibration elastography with application to filter-design for tissue characterization 不可压缩剪切、振动弹性学亥姆霍兹反演的误差分析及其在组织表征滤波器设计中的应用

2000 IEEE Ultrasonics Symposium. Proceedings. An International Symposium (Cat. No.00CH37121) Pub Date : 2000-12-01 DOI: 10.1109/ULTSYM.2000.921671

T. Oliphant, R. Kinnick, A. Manduca, R. Ehman, J. F. Greenleaf

{"title":"An error analysis of Helmholtz inversion for incompressible shear, vibration elastography with application to filter-design for tissue characterization","authors":"T. Oliphant, R. Kinnick, A. Manduca, R. Ehman, J. F. Greenleaf","doi":"10.1109/ULTSYM.2000.921671","DOIUrl":"https://doi.org/10.1109/ULTSYM.2000.921671","url":null,"abstract":"For over fifteen years there has been significant effort in elastography, which describes the general area of imaging material mechanical properties. Shear vibration elastography uses dynamic tissue displacements to infer material properties from the physics of motion. The method can be used with both magnetic resonance and ultrasound data, which can both be modeled with the time-harmonic, Helmholtz equation if the material is linear, isotropic, incompressible, and piecewise-homogeneous. In this work, we develop a unified perspective on direct Helmholtz inversion. Using the fundamental theorem of statistics and a Gaussian noise model, we present a closed form for the joint conditional probability distribution of the real and imaginary parts of the squared wavenumber given the data and an arbitrary set of weights. An approximate distribution can be used in the case of high SNR which allows a figure-of-merit to be established to objectively compare inversion approaches. Adaptively choosing the inversion weights for each subregion as the smoothed and windowed conjugate of the data results in a narrow conditional probability distribution function and, consequently, high-quality estimates of complex shear modulus. To test the results, we used experimental ultrasound data-collected using a focused 5 MHz transducer with a pulse-repetition frequency of 4 kHz in a block of 15% bovine gel. The gel was harmonically compressed using a signal containing equal amplitudes at frequencies of 200, 300, 400 and 500 Hz. Noise on the measured displacement was estimated from the magnitude of the complex (baseband) correlation function and used with the conditional probability distribution function to report error bars on single-region estimates of complex shear modulus, wave-speed and attenuation.","PeriodicalId":350384,"journal":{"name":"2000 IEEE Ultrasonics Symposium. Proceedings. An International Symposium (Cat. No.00CH37121)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131141236","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: 34

Effects of diffraction on the measurement of the acoustic properties of liquids in thin-walled containers 衍射对薄壁容器中液体声学特性测量的影响

2000 IEEE Ultrasonics Symposium. Proceedings. An International Symposium (Cat. No.00CH37121) Pub Date : 2000-11-01 DOI: 10.1109/ULTSYM.2000.922666

G. Kaduchak, D. Sinha

引用次数: 1