2007 IEEE Ultrasonics Symposium Proceedings最新文献_第3页

P3B-7 Study on Harmonic Pulse Compression Imaging with Consideration of Harmonic Property 考虑谐波特性的P3B-7谐波脉冲压缩成像研究

2007 IEEE Ultrasonics Symposium Proceedings Pub Date : 2007-12-26 DOI: 10.1109/ULTSYM.2007.442

M. Fujiwara, M. Tanabe, N. Akazawa, K. Okubo, N. Tagawa

引用次数: 0

10B-6 A Composite Imaging Technique for High Frame-Rate and Full-View Cardiovascular Ultrasound and Elasticity Imaging 10B-6高帧率全视野心血管超声与弹性成像的复合成像技术

2007 IEEE Ultrasonics Symposium Proceedings Pub Date : 2007-12-26 DOI: 10.1109/ULTSYM.2007.225

Shougang Wang, Wei-Ning Lee, Jianwen Luo, E. Konofagou

{"title":"10B-6 A Composite Imaging Technique for High Frame-Rate and Full-View Cardiovascular Ultrasound and Elasticity Imaging","authors":"Shougang Wang, Wei-Ning Lee, Jianwen Luo, E. Konofagou","doi":"10.1109/ULTSYM.2007.225","DOIUrl":"https://doi.org/10.1109/ULTSYM.2007.225","url":null,"abstract":"The frame-rate of ultrasound radio-frequency (RF) data acquisition is critical for imaging of the pulse wave and electromechanical wave propagation in cardiovascular tissues as well as improving the strain estimation. Therefore, an automated method had been developed to overcome the frame-rate limitations on standard systems by retrospective multi-sector signal acquisition through an electrocardiogram (ECG) gating technique. The method achieved a frame rate of 481 Hz at a 100% field of view, 64 line densities and an imaging depth of 11 cm. The composite full-view images were reconstructed by retrospectively combining seven small-sector RF frames using the ECG-gating technique. The axial displacements of both long-axis and short-axis views of a human left ventricle and a long-axis view of the abdominal aorta were calculated using an RF based speckle-tracking technique comprising ID cross-correlation methods in a 2D search (window size of 6.9 mm and overlap of 80%). Several sequences of electromechanical waves propagating in a left ventricular long-axis and short-axis view, and long-axis view of abdominal aorta were imaged at high frame rates. Currently, the method was implemented on an Ultrasonix RP system (Ultrasonix Medical Corp. Richmond, Canada) and could be potentially implemented on other clinical systems.","PeriodicalId":6355,"journal":{"name":"2007 IEEE Ultrasonics Symposium Proceedings","volume":"3 1","pages":"880-883"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84167469","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: 9

9F-2 Heat Conductive Array Transducer for Phase-Conversion Molecular Imaging 用于相转换分子成像的9F-2导热阵列传感器

2007 IEEE Ultrasonics Symposium Proceedings Pub Date : 2007-12-26 DOI: 10.1109/ULTSYM.2007.214

T. Azuma, S. Sonoda, K. Kawabata, S. Umemura

{"title":"9F-2 Heat Conductive Array Transducer for Phase-Conversion Molecular Imaging","authors":"T. Azuma, S. Sonoda, K. Kawabata, S. Umemura","doi":"10.1109/ULTSYM.2007.214","DOIUrl":"https://doi.org/10.1109/ULTSYM.2007.214","url":null,"abstract":"A heat conductive array transducer was designed for transmitting high power ultrasound as well as transmitting and receiving wideband pulse waves. In phase-conversion ultrasonic molecular imaging, tissue-selective nano-droplets are converted to contrast microbubbles by a long duration ultrasonic pulse with a relatively high amplitude. When a conventional imaging array transducer was used, sensitivity of transducer decreased caused by some breakdown processes. In this study, we firstly examined the breakdown process based on experiments and numerical simulations. The experimental result was consistent with the simulation result assuming peeling of the adhesive between two PZT layers. A new transducer structure using a heat conducting acoustic isolation layer (AIL) on a metal heat sink block was conceived to inhibit this type of breakdown while maintaining the wide bandwidth for imaging with a high resolution. Heat generated in the PZT and adjacent layers can diffuse into a metal heat conductor through the AIL. Since the AIL reflects pulses, a possible unwanted response due to reflection at the opposite side of the metal block will be suppressed. The temperature rise and the ultrasonic pulse response of the transducer were calculated using PZFlex. The temperature rise in the transducer immediately after driving at 40 V for 25 s with 1% duty ratio was 37 degrees for the proposed structure, much lower than that for the conventional structure of 56 degrees. No serious unwanted response was observed for the proposed structure. These results show that the proposed structure will be useful for a high-power wideband phased array transducer.","PeriodicalId":6355,"journal":{"name":"2007 IEEE Ultrasonics Symposium Proceedings","volume":"11 1","pages":"836-839"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78254124","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

P0-10 A Ray Technique to Calculate Multiple Reflected and Transmitted Waves in Layered Media 层状介质中多重反射波和透射波的射线计算技术

2007 IEEE Ultrasonics Symposium Proceedings Pub Date : 2007-12-26 DOI: 10.1109/ULTSYM.2007.307

J. Sadler, R. Maev

引用次数: 1

2C-5 Simplification of High Frame Rate Imaging System with Coordinate Rotation 坐标旋转下高帧率成像系统的2C-5简化

2007 IEEE Ultrasonics Symposium Proceedings Pub Date : 2007-12-26 DOI: 10.1109/ULTSYM.2007.22

Jian-yu Lu, S. Kwon

引用次数: 6

P4G-6 A New Method for the Inspection of Tool Wear Based on the Dispersion of ASF Modes 基于ASF模态弥散的刀具磨损检测新方法

2007 IEEE Ultrasonics Symposium Proceedings Pub Date : 2007-12-26 DOI: 10.1109/ULTSYM.2007.518

Che-Hua Yang, Chia-hao Hsu, S. Du

{"title":"P4G-6 A New Method for the Inspection of Tool Wear Based on the Dispersion of ASF Modes","authors":"Che-Hua Yang, Chia-hao Hsu, S. Du","doi":"10.1109/ULTSYM.2007.518","DOIUrl":"https://doi.org/10.1109/ULTSYM.2007.518","url":null,"abstract":"Discovered by Lagasse in early 1970's through a numerical study, wedge waves are guided acoustic waves propagating along the tip of a wedge, with energy tightly confined near the apex. Like Lamb waves, wedge waves with displacement field anti-symmetric about the mid-apex-plane are called anti-symmetric flexural (ASF) modes. Without apex truncation, the ASF modes are non-dispersive. However, with apex truncation, the ASF modes are dispersive and the dispersion relation is highly sensitive to the apex truncation. In this research, a laser ultrasound technique (LUT) with a three- dimensional scanning is employed for a non-contact measurement of the ASF dispersion which is related to the tool wear. The basic measurement principle is the dispersion behavior of ASF mode influenced by the wear condition of the machine tool. Figure 1 shows a micrograph of the tool tip before it is used for machining. The tool is then arranged for a sequence of machining/LUT measurement procedure. The ASF dispersion curve is strongly influenced by the machining time. The measured dispersion slopes show as good measure for the quantitative wear of the tools. The current result suggests that dispersion of the ASF modes propagating along the tool tip could be an effective measure for the wear condition. The current technique is continuously been developed to meet the criteria of serving as an on-line wear characterizing technique.","PeriodicalId":6355,"journal":{"name":"2007 IEEE Ultrasonics Symposium Proceedings","volume":"25 1","pages":"2061-2063"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76656889","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: 3

P2G-2 Capacitively Coupled VHF Silicon Bulk Acoustic Wave Filters P2G-2电容耦合甚高频硅体声波滤波器

2007 IEEE Ultrasonics Symposium Proceedings Pub Date : 2007-12-26 DOI: 10.1109/ULTSYM.2007.415

Qishu Qin, S. Pourkamali, F. Ayazi

引用次数: 4

P4F-7 Integration of a Pressure Sensing Array Into Ultrasound Elastography 压力传感阵列集成到超声弹性成像中的P4F-7

2007 IEEE Ultrasonics Symposium Proceedings Pub Date : 2007-12-26 DOI: 10.1109/ULTSYM.2007.514

L. Kiessel, T. Hall, Jingfeng Jiang

{"title":"P4F-7 Integration of a Pressure Sensing Array Into Ultrasound Elastography","authors":"L. Kiessel, T. Hall, Jingfeng Jiang","doi":"10.1109/ULTSYM.2007.514","DOIUrl":"https://doi.org/10.1109/ULTSYM.2007.514","url":null,"abstract":"Mechanical in vitro tests and in vivo elasticity imaging have shown differences between breast tissue types in their nonlinear stress/strain behavior, which could be utilized to differentiate between benign and malignant lesions potentially reducing the benign biopsy rate. Stress and strain measurements are required for absolute measures of this non-linear behavior in vivo. A variety of tests were performed with a prototype pressure sensor array to gauge its stability, sensitivity and calibration in reference to its application in ultrasound elastography. Measurements on elastographic phantoms were also performed and compared to finite element analysis (FEA) simulations. In addition, data was collected from patients undergoing ultrasound elasticity imaging at the University of Wisconsin Breast Center. Initial tests show that the pressure sensor array is stable in an ultrasound imaging environment. A reliable calibration technique was also developed, with reproducibility to within 5% for most elements. Tests also show a wide disparity in sensitivity among elements. The best performing elements are capable of detecting pressure as low as about 100 Pa. The average minimum detectable pressure was about 800 Pa. This suggests that the array is capable of detecting initial contact and measuring the contact force during a deformation of the breast - a critical task for quantifying stress/strain nonlinearities. The preliminary clinical trial confirmed this prediction. However, surface pressure distribution measurements on phantoms have shown only modest agreement with FEA simulations. Geometric uncertainties on the surface of the sensor as well as the variability of the absolute calibration make the array ill suited to measure accurate maps of the surface pressure distribution which might limit its utility for elastic modulus reconstructions.","PeriodicalId":6355,"journal":{"name":"2007 IEEE Ultrasonics Symposium Proceedings","volume":"13 1","pages":"2046-2049"},"PeriodicalIF":0.0,"publicationDate":"2007-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82414945","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

P1D-2 High Temperature Langasite BAW Gas Sensor Based on ZnO Nanowire Arrays 基于ZnO纳米线阵列的P1D-2型高温Langasite BAW气体传感器

2007 IEEE Ultrasonics Symposium Proceedings Pub Date : 2007-12-26 DOI: 10.1109/ULTSYM.2007.342

Hongbin Cheng, Lifeng Qin, Qing-Ming Wang

引用次数: 7

11D-2 Total Focussing Method for Volumetric Imaging in Immersion Non Destructive Evaluation 11D-2浸泡无损评价中体积成像的全聚焦方法

2007 IEEE Ultrasonics Symposium Proceedings Pub Date : 2007-12-26 DOI: 10.1109/ULTSYM.2007.259

A. Tweedie, R. O’Leary, G. Harvey, A. Gachagan, C. Holmes, P. Wilcox, B. Drinkwater

引用次数: 6