2009 IEEE International Ultrasonics Symposium最新文献_第10页

Sources and characterization of clutter in cardiac B-mode images 心脏b型图像杂波的来源和特征

2009 IEEE International Ultrasonics Symposium Pub Date : 2009-09-01 DOI: 10.1109/ULTSYM.2009.5441606

M. Lediju, B. Byram, G. Trahey

{"title":"Sources and characterization of clutter in cardiac B-mode images","authors":"M. Lediju, B. Byram, G. Trahey","doi":"10.1109/ULTSYM.2009.5441606","DOIUrl":"https://doi.org/10.1109/ULTSYM.2009.5441606","url":null,"abstract":"In echocardiography, clutter is one of the most problematic image artifacts, often obscuring ventricular borders and introducing stationary noise in blood flow measurements. Clutter in transthoracic cardiac images is widely understood to originate from reverberations and off-axis echoes. The objective of this work is to investigate the sources of clutter in cardiac images and their relative contributions. Real-time 3D raw echo data was acquired at a volumetric frame rate of 1 kHz and speckle tracking was applied to resulting images to determine the motion characteristics of clutter and adjacent myocardium. When clutter adjacent to the myocardial wall was tracked, the clutter and adjacent myocardium had similar displacements. When clutter farther from the myocardial wall was tracked, displacements were temporally and spatially complex and did not correlate well with any portion of the myocardium. In addition, principal component analysis (PCA) was applied to the raw echo data and resulting eigenvectors were used to isolate various motion patterns in the cardiac data. Results support the hypothesis that echoes from stationary structures, such as the ribcage and chest wall, are contributors to stationary clutter noise, while the myocardium is a dominant source of nonstationary clutter.","PeriodicalId":368182,"journal":{"name":"2009 IEEE International Ultrasonics Symposium","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123167605","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: 19

SAW OFC strain sensor SAW OFC应变传感器

2009 IEEE International Ultrasonics Symposium Pub Date : 2009-09-01 DOI: 10.1109/ULTSYM.2009.5441544

M. Roller, D. Malocha, R. Vaidyanathan

引用次数: 8

Experimental evaluation of the moving linear array technique applied to livescan biometrics 移动线性阵列技术应用于活体生物识别的实验评价

2009 IEEE International Ultrasonics Symposium Pub Date : 2009-09-01 DOI: 10.1109/ULTSYM.2009.5441710

A. Iula, M. De Santis, G. Caliano, M. Pappalardo

引用次数: 6

Sound propagation in thin-walled elastic pipe with viscous liquid-bubble mixture and deformable central rod 具有粘性液泡混合气和中心杆可变形的薄壁弹性管中的声传播

2009 IEEE International Ultrasonics Symposium Pub Date : 2009-09-01 DOI: 10.1109/ULTSYM.2009.5442029

R. Bergman, S. Levitsky, J. Haddad

引用次数: 0

On the imaging of slip boundaries using 3D elastography 三维弹性成像技术在滑移边界成像中的应用

2009 IEEE International Ultrasonics Symposium Pub Date : 2009-09-01 DOI: 10.1109/ULTSYM.2009.5441722

Leo J Garcia, C. Uff, J. Fromageau, J. Bamber

引用次数: 1

RF MEMS: Focusing on the next step RF MEMS:关注下一步

2009 IEEE International Ultrasonics Symposium Pub Date : 2009-09-01 DOI: 10.1109/ULTSYM.2009.5442083

T. Oita

{"title":"RF MEMS: Focusing on the next step","authors":"T. Oita","doi":"10.1109/ULTSYM.2009.5442083","DOIUrl":"https://doi.org/10.1109/ULTSYM.2009.5442083","url":null,"abstract":"Radio frequency and mixed signal semiconductor technologies have been improving and play a big role in the rapidly growing market of wireless communication. Higher integration of CMOS technologies due to “More Moore”s Law is helping this success. In parallel, some of the RF micro device technologies have been very popular, especially for frequency selection such as piezoelectric material devices by using MEMS technology. On the other hand, there are many wireless services already in existence such as various kind of cellular standards, many private systems representing IEEE 802.11/15 WLAN, Bluetooth, and public mobile services, and also there are coming up new systems such as “Ultra Wide Band”, and “Wireless Sensor Network”. Since all these services have different carrier frequencies, channel bandwidth, and various kinds of modulation systems a single solution is not tenable. This led the industry toward the concept of the “Software Defined Radio”. This has been discussed for many years, leading to a vision of a “Cognitive Radio”. Expectation of a “Cognitive Radio” is that it can change its radio functions by swapping software instead of replacing hardware. It is clear that conventional A/D converters with high data rates and large dynamic range will not suffice. Thus, it has been said that RF MEMS is a strong contender as a complimentary technology, allowing “More Than Moore” to enable the ubiquitous connectivity. Paper discussed current status of the RF MEMS technology briefly including switches, LC, oscillators/filters using Piezoelectric materials, Silicon, and Metal, besides focusing on the next step of RF MEMS with the keyword of “Tunable”, “Selectable” and “Combination”. The focus for RF MEMS for the next step demonstrated, “Matching modules”, “Front Ends”, “Filter Banks”, “Improving the resonator performances for the wireless application” and “Creating new functions for RF MEMS”. The next step for RF MEMS is not only technology discussions, but also the international standardization for the RF MEMS industry and wireless communication products.","PeriodicalId":368182,"journal":{"name":"2009 IEEE International Ultrasonics Symposium","volume":"21 5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115728705","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: 11

Waveguide localization in graded crystals with antiguiding acoustic velocity profile 具有反导声速分布的梯度晶体中的波导定位

2009 IEEE International Ultrasonics Symposium Pub Date : 2009-09-01 DOI: 10.1109/ULTSYM.2009.5441908

A. V. Kozlov, V. Mozhaev, A. Zyryanova

引用次数: 0

Nanoparticle patterning in a microfluidic drop induced by surface acoustic waves 表面声波诱导的微流控滴中的纳米颗粒图案

2009 IEEE International Ultrasonics Symposium Pub Date : 2009-09-01 DOI: 10.1109/ULTSYM.2009.5441910

L. Yeo, J. Friend, Haiyan Li

引用次数: 1

A design procedure for an acoustic mirror providing dual reflection of longitudinal and shear waves in Solidly Mounted BAW Resonators (SMRs) 固体BAW谐振器中纵波和横波双反射声镜的设计过程

2009 IEEE International Ultrasonics Symposium Pub Date : 2009-09-01 DOI: 10.1109/ULTSYM.2009.5442065

S. Jose, A. Jansman, R. Hueting

引用次数: 9

Classification of benign and malignant breast tumors by the contour analysis and scatterers characterization 乳腺良恶性肿瘤的轮廓分析和散点特征分类

2009 IEEE International Ultrasonics Symposium Pub Date : 2009-09-01 DOI: 10.1109/ULTSYM.2009.5441446

Y. Liao, C. Yeh, P. Tsui, Chien-Cheng Chang

{"title":"Classification of benign and malignant breast tumors by the contour analysis and scatterers characterization","authors":"Y. Liao, C. Yeh, P. Tsui, Chien-Cheng Chang","doi":"10.1109/ULTSYM.2009.5441446","DOIUrl":"https://doi.org/10.1109/ULTSYM.2009.5441446","url":null,"abstract":"The B-scan reflects the intensity of the reflected echoes, and is clever at a clear description of tumor contour to provide knowledge of morphology, and the Nakagami image reflects the statistical distribution of local backscattered signals, which is associated with the arrangements and concentrations of scatterers in tumors. In this study, we explored the clinical performance of combining the B-scan-based tumor contour analysis and the Nakagami-image-based tumor scatterers characterization in classifying benign and malignant breast tumors. To confirm this concept, rawdata obtained from 60 clinical cases were acquired. The B-mode images were used to calculate the standard deviation of the shortest path for contour feature analysis, and the Nakagami images were applied to estimate the average Nakagami parameters in the region of interests (ROI) in tumors. Overall, malignant tumors were highly irregular in tumor contour, whereas they had lower average Nakagami parameters in scatterers characterization. The receiver operating characteristic (ROC) curve and fuzzy c-means (FCM) clustering were used to estimate the performances of combining two parameters in classifying tumors. The clinical results showed that there would be a tradeoff between the sensitivity and specificity when using a single parameter to differentiate benign and malignant tumors. The ROC analysis demonstrated that the standard deviation (SD) of the shortest distance had a diagnostic accuracy of 81.7%, sensitivity of 76.7%, and specificity of 86.7%. The Nakagami parameter had a diagnostic accuracy of 80%, sensitivity of 86.7%, and specificity of 73.3%. However, the combination of the SD of the shortest distance and the Nakagami parameter concurrently allows both the sensitivity and specificity to exceed 80%, making the performance to diagnose breast tumors better.","PeriodicalId":368182,"journal":{"name":"2009 IEEE International Ultrasonics Symposium","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114690484","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