1996 IEEE Ultrasonics Symposium. Proceedings最新文献_第10页

Characterization of bone tissue by analysis of the ultrasonic waves scattered around cancellous bone 通过分析松质骨周围的超声波来表征骨组织

1996 IEEE Ultrasonics Symposium. Proceedings Pub Date : 1996-11-03 DOI: 10.1109/ULTSYM.1996.584187

K. Kitamura, H. Pan, S. Ueha, S. Kimura, N. Ohtomo

{"title":"Characterization of bone tissue by analysis of the ultrasonic waves scattered around cancellous bone","authors":"K. Kitamura, H. Pan, S. Ueha, S. Kimura, N. Ohtomo","doi":"10.1109/ULTSYM.1996.584187","DOIUrl":"https://doi.org/10.1109/ULTSYM.1996.584187","url":null,"abstract":"Accurate diagnosis of osteoporosis requires the nondestructive measurement of the thickness and interval of trabecular bones. This paper demonstrates procedure of analyzing the ultrasonic waves scattered by cancellous bone tissue and the success of estimating the average thickness and the average interval of trabecular bones. To determine primary mechanism of the scattered ultrasonic wave in a simple manner, the authors make some simplifying assumptions, i.e., all the axes of trabecular bones are vertical to the detecting plane, all the cross sections of trabecular bones cut by the detecting plane are perfect circles, and the trabecular bones are distributed periodically. These assumptions enable the formulation of an ideal model of the cancellous bone tissue, periodic distribution of perfect cylinders, and the scattering function is derived using the model. The experimentally estimated values of the thickness and interval of trabecular bone in formalinized human heel (in-vitro), are approximately equal to the values measured with a mechanical scale. The proposed procedures are applied for a human heel (in-vivo) and the estimated values of the interval and thickness are close to the expected values for a human heel.","PeriodicalId":278111,"journal":{"name":"1996 IEEE Ultrasonics Symposium. Proceedings","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129333641","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

Human fetal diagnostic ultrasound exposimetry system 人胎诊断超声暴露系统

1996 IEEE Ultrasonics Symposium. Proceedings Pub Date : 1996-11-03 DOI: 10.1109/ULTSYM.1996.584198

Dudley Swiney, W. O’Brien

{"title":"Human fetal diagnostic ultrasound exposimetry system","authors":"Dudley Swiney, W. O’Brien","doi":"10.1109/ULTSYM.1996.584198","DOIUrl":"https://doi.org/10.1109/ULTSYM.1996.584198","url":null,"abstract":"Significant improvements have been made to a unique human fetal diagnostic ultrasound exposimetry system which has been designed to measure acoustic pressure in situ with a 7-element linear array hydrophone during an obstetric ultrasound examination. The purpose of the exposimetry system is to develop a data base of fundamental ultrasound propagation properties for human tissue under in vivo conditions from which the ultrasound exposure, and possibly the ultrasound dose, can be estimated under normal clinical conditions. The basic system design allows for the obstetrician to record calibrated acoustic pressure waveforms in situ that have propagated through tissue layers under conditions in which both the diagnostic ultrasound transducer and the calibrated hydrophone are hand-held. The improvements have increased the reliability of the recorded acoustic pressure waveform and provided the new capability of recording the image from the diagnostic ultrasound system simultaneously with the acoustic pressure waveform. The RF acoustic pressure waveforms are digitized at 50 MHz and displayed on a monitor to provide direct visual feedback to the obstetrician. The recorded acoustic pressure waveform is based on a two-decision process. First, the pulse intensity integral (PII), a measure of energy in the pulse, is calculated for each acquired waveform and subsequent recorded waveforms must have a greater PII. Second, a correlation coefficient is calculated for each acquired waveform and must exceed a predetermined correlation coefficient to be recorded. At the same time an RF pressure waveform is acquired, the exposimetry system digitally records the image from the diagnostic ultrasound scanner. This image shows the location of the hydrophone and provides the basis for estimating the types and distances of tissue layers between the diagnostic ultrasound scanner and the hydrophone, thus providing a direct tie between the acoustic propagation path and the recorded calibrated waveform.","PeriodicalId":278111,"journal":{"name":"1996 IEEE Ultrasonics Symposium. Proceedings","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129517224","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: 4

Evaluation of a multi frequency technique for blood perfusion measurements 多频血流灌注测量技术的评价

1996 IEEE Ultrasonics Symposium. Proceedings Pub Date : 1996-11-03 DOI: 10.1109/ULTSYM.1996.584209

T. Jansson, H. Persson, K. Lindstrom

引用次数: 4

Propagation of Love waves in lossy media Love波在有损介质中的传播

1996 IEEE Ultrasonics Symposium. Proceedings Pub Date : 1996-11-03 DOI: 10.1109/ULTSYM.1996.584001

P. Kielczynski, J. Cheeke

引用次数: 0

Finite impulse response utilizing the principle of superposition 利用叠加原理的有限脉冲响应

1996 IEEE Ultrasonics Symposium. Proceedings Pub Date : 1996-11-03 DOI: 10.1109/ULTSYM.1996.583827

S.E. Carter, D. Malocha

{"title":"Finite impulse response utilizing the principle of superposition","authors":"S.E. Carter, D. Malocha","doi":"10.1109/ULTSYM.1996.583827","DOIUrl":"https://doi.org/10.1109/ULTSYM.1996.583827","url":null,"abstract":"A critical parameter in any finite impulse response (FIR) design is the impulse response length, which must be optimized for the given design specifications in order to reduce the filter size. To this end, many design algorithms have been introduced such as Remez exchange, linear programming, and least mean squares. A new algorithm has been derived which is simple, efficient, and accurate for the design of arbitrary filter specifications which requires greatly reduced computation time compared to many other FIR approaches for high order, low shape factor filters. An overview of the design process is given and the design technique used to design filters with tailored passband and stopband responses to yield near-optimum time length is presented. The results of the current FIR approach are discussed and compared with other design techniques. The effect of monotonically increasing sidelobes in reducing the impulse response length versus an equiripple sidelobe design is discussed and the reason illustrated. A surface acoustic wave (SAW) filter design where one transducer is designed to compensate for a second transducer and modeled second order effects is presented.","PeriodicalId":278111,"journal":{"name":"1996 IEEE Ultrasonics Symposium. Proceedings","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128650132","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

Two channel SAW spread spectrum transmission system for audio signals 双通道声呐扩频传输系统用于音频信号

1996 IEEE Ultrasonics Symposium. Proceedings Pub Date : 1996-11-03 DOI: 10.1109/ULTSYM.1996.583783

J. Enderlein, S. Bechstein, E. Chilla, H.-J. Frohlich

引用次数: 0

Remote vibration measurements using airborne ultrasound 利用机载超声波进行远程振动测量

1996 IEEE Ultrasonics Symposium. Proceedings Pub Date : 1996-11-03 DOI: 10.1109/ULTSYM.1996.584068

H. Persson, H. Hakansson

引用次数: 6

SAW dispersive equivalent circuit modeling for diamond layered structures 金刚石层状结构的SAW色散等效电路建模

1996 IEEE Ultrasonics Symposium. Proceedings Pub Date : 1996-11-03 DOI: 10.1109/ULTSYM.1996.583828

A. Hachigo, D. Malocha

引用次数: 2

Piezoelectric sensor for the investigation of material surfaces 用于研究材料表面的压电传感器

1996 IEEE Ultrasonics Symposium. Proceedings Pub Date : 1996-11-03 DOI: 10.1109/ULTSYM.1996.584000

W. Pajewski, P. Kielczynski, M. Szalewski

引用次数: 2

Optical probing of nonlinear SAW waveform 非线性声表面波的光学探测

1996 IEEE Ultrasonics Symposium. Proceedings Pub Date : 1996-11-03 DOI: 10.1109/ULTSYM.1996.584124

V. Kavalerov, N. Kasaya, M. Inoue, T. Fujii

引用次数: 3