2014 IEEE International Ultrasonics Symposium最新文献_第8页

Micro-elasticity (μ-E): CNR and resolution of acoustic radiation force impulse imaging and single- and multiple track location shear wave elasticity imaging for visualizing small targets 微弹性(μ-E):用于小目标可视化的声辐射力脉冲成像和单航迹和多航迹位置剪切波弹性成像的CNR和分辨率

2014 IEEE International Ultrasonics Symposium Pub Date : 2014-10-23 DOI: 10.1109/ULTSYM.2014.0173

P. Hollender, S. Rosenzweig, K. Nightingale, G. Trahey

引用次数: 6

Phased array inspection at elevated temperatures 高温下相控阵检测

2014 IEEE International Ultrasonics Symposium Pub Date : 2014-10-23 DOI: 10.1109/ULTSYM.2014.0210

M. Marvasti, A. Sinclair

{"title":"Phased array inspection at elevated temperatures","authors":"M. Marvasti, A. Sinclair","doi":"10.1109/ULTSYM.2014.0210","DOIUrl":"https://doi.org/10.1109/ULTSYM.2014.0210","url":null,"abstract":"Interruption of plant operation can be avoided if non destructive testing inspections are performed on-line at operating temperatures, which may be up to several hundred degrees Celsius in a petrochemical or electric power generating plant. However, there are operational temperature limits for the phased array transducers and associated plastic wedges used for ultrasonic inspections. In this paper, an ultrasonic phased array system is described for inspections at elevated temperatures of up to 350°C. Wedges are built from plastics resistant to high temperature degradation, and equipped with a cooling jacket around the array. A model of the ultrasonic beam skew pattern due to thermal gradients inside a wedge is developed. The model is used in a separate algorithm to calculate transmission and reception time delays on individual array elements for generation of plane waves in a hot test piece, while compensating for thermal gradient effects inside the wedge. The algorithm results for planar wave inspections of test pieces at 150°C demonstrate that application of conventional element time delays can lead to serious phase errors. Experimental trials indicate that plane waves can be generated in a hot test piece using the new focal law algorithm with appropriate timing delays applied to all active array elements.","PeriodicalId":153901,"journal":{"name":"2014 IEEE International Ultrasonics Symposium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129962362","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: 5

Matching layers design for a plate waveguide ultrasonic transducer for flow measurement in hostile environments 用于恶劣环境中流量测量的板波导超声换能器的匹配层设计

2014 IEEE International Ultrasonics Symposium Pub Date : 2014-10-23 DOI: 10.1109/ULTSYM.2014.0623

M. Laws, S. Dixon, S. Ramadas

{"title":"Matching layers design for a plate waveguide ultrasonic transducer for flow measurement in hostile environments","authors":"M. Laws, S. Dixon, S. Ramadas","doi":"10.1109/ULTSYM.2014.0623","DOIUrl":"https://doi.org/10.1109/ULTSYM.2014.0623","url":null,"abstract":"A wetted ultrasonic transducer with an integrated thermal buffer could allow ultrasonic techniques to be used for flow measurement in harsh environments. We have previously presented one such buffer design, consisting of parallel stainless steel strip waveguides. One disadvantage of such a design is the large impedance mismatch which is created between the buffer material and the test fluid, reducing the transmitted energy. The addition of a matching layer, with an intermediate acoustic impedance, to the waveguide can assist in reducing this effect. Such matching layers are commonly used in conventional ultrasonic transducer design, however for this application additional consideration must be given to the material selection to ensure they are suitable for use in hostile environments. In this work we have investigated several materials, selected for their thermal stability, which were then modified by loading, in order to tailor the acoustic properties to best suit our application. These materials have then been investigated using both finite element modelling and experimental techniques quantify their effectiveness as matching layers for a strip waveguide transducer system. This work has shown that and increase in the maximum emitted pressure by a factor of 3.4 may be obtained using a tungsten loaded matching layer.","PeriodicalId":153901,"journal":{"name":"2014 IEEE International Ultrasonics Symposium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129169280","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

Forming acoustic attraction force to concentrate microbubbles in flow using a matrix array transducer 利用矩阵式换能器形成声吸引力，使流动中的微气泡集中

2014 IEEE International Ultrasonics Symposium Pub Date : 2014-10-23 DOI: 10.1109/ULTSYM.2014.0442

N. Hosaka, Shinya Miyazawa, Toi Sawaguchi, R. Koda, S. Onogi, T. Mochizuki, K. Masuda

引用次数: 4

In vivo acoustic contrast enhancement via simultaneous production and injection of microfluidic-produced microbubbles 通过同时产生和注射微流体产生的微泡来增强体内声学对比

2014 IEEE International Ultrasonics Symposium Pub Date : 2014-10-23 DOI: 10.1109/ULTSYM.2014.0205

A. Dixon, A. Dhanaliwala, Dan Lin, Johnny L. Chen, A. Klibanov, J. Hossack

{"title":"In vivo acoustic contrast enhancement via simultaneous production and injection of microfluidic-produced microbubbles","authors":"A. Dixon, A. Dhanaliwala, Dan Lin, Johnny L. Chen, A. Klibanov, J. Hossack","doi":"10.1109/ULTSYM.2014.0205","DOIUrl":"https://doi.org/10.1109/ULTSYM.2014.0205","url":null,"abstract":"Microbubble production by microfluidic devices for ultrasound contrast enhancement allows for precise control over microbubble diameter but at the cost of low production rate and poor microbubble stability. In this work, we investigated whether microbubbles produced by a microfluidic device could provide sufficient ultrasound contrast enhancement when directly injected into the mouse tail vein. Microfluidic-produced microbubbles composed of nitrogen gas and stabilized with 10% dextrose and 3% bovine serum albumin were injected for 10 seconds into the tail vein of wild type C57BL/6 mice. Short-axis ultrasound images of the right and left ventricle were acquired at 12.5 MHz and image intensity over time was analyzed. Microbubble production rates ranged between 2.5×105 and 8.3×105 microbubbles/s, and microbubble diameters were between 9.1 and 19 μm. In all cases, microbubbles were observed in both the right and left ventricle, although the average contrast enhancement was approximately 13.5 dB lower in the left ventricle than in the right ventricle. All mice survived the procedure with no observable respiratory or heart rate distress. The results of this work suggest that on-site production and immediate administration to the murine vasculature may eliminate the necessity for high microbubble production rates, long-term stability, or small microbubble diameters.","PeriodicalId":153901,"journal":{"name":"2014 IEEE International Ultrasonics Symposium","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132334553","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

Model-driven engineering applied to the development of embedded software for B-mode ultrasound imaging systems - A case study 模型驱动工程应用于b型超声成像系统嵌入式软件的开发-一个案例研究

2014 IEEE International Ultrasonics Symposium Pub Date : 2014-10-23 DOI: 10.1109/ULTSYM.2014.0311

H. J. Onisto, Tiago de Moraes Machado, Ramon Cravo Fernandes, Johannes Dantas de Medeiros Junior, Iliezer Tamagno, Tiago Cesar Dezotti, J. Bertuzzo

引用次数: 3

Multiple electrode piezoelectric micromachined ultrasonic transducers 多电极压电微机械超声换能器

2014 IEEE International Ultrasonics Symposium Pub Date : 2014-10-23 DOI: 10.1109/ULTSYM.2014.0075

F. Sammoura, Sina Akhari, Nawal Aqab, M. Mahmoud, Liwei Lin

引用次数: 17

A new automated breast ultrasound system with dual wide field-of-view imaging 具有双宽视场成像的新型自动乳房超声系统

2014 IEEE International Ultrasonics Symposium Pub Date : 2014-10-23 DOI: 10.1109/ULTSYM.2014.0400

Jaeyoung Son, Jong-Ho Park, H. Song, Sunmi Yeo, J. Chang, T. Song, Y. Yoo

{"title":"A new automated breast ultrasound system with dual wide field-of-view imaging","authors":"Jaeyoung Son, Jong-Ho Park, H. Song, Sunmi Yeo, J. Chang, T. Song, Y. Yoo","doi":"10.1109/ULTSYM.2014.0400","DOIUrl":"https://doi.org/10.1109/ULTSYM.2014.0400","url":null,"abstract":"Breast ultrasound imaging is useful for observing the mass according to the desired locations and differentiating the shape of consistency of the mass during breast cancer screening, but its performance is highly dependent on the examiners' skill and has a poor reproducibility. Recently-introduced automated breast ultrasound (ABUS) systems have a potential to decrease user dependency due to its automated scanning protocols. However, the current ABUS system suffers from the limited field-of-view (FOV) and the long scanning time. In this paper, a new automated breast ultrasound system with dual wide field-of-view imaging is presented. In the developed ABUS system, two 1024-element wide field-of-view linear array transducers are used for accelerating scanning time. To support dual wide transducers, two 1024-to-128 high-voltage multiplexing board and four transmit/ receive boards were embedded. The beamformed radio-frequency data are transferred to a PC module via a PCI express 2.0 interface, and then mid and back-end processing is conducted by a graphics processing unit using CUDA. This system can acquire a 3D breast volume set with 20 cm (width) × 25 cm (length) × 8 cm (depth) within 20 seconds. The further evaluation of the developed ABUS system including pre-clinical studies is under investigation. These results indicate that the proposed dual wide FOV-based ABUS system can enlarge the FOV and reduce the volume scanning time for improving clinical productivity of breast ultrasound imaging.","PeriodicalId":153901,"journal":{"name":"2014 IEEE International Ultrasonics Symposium","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131325390","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

New approach for objective cataract classification based on ultrasound techniques using multiclass SVM classifiers 基于超声技术的多类SVM分类器白内障客观分类新方法

2014 IEEE International Ultrasonics Symposium Pub Date : 2014-10-23 DOI: 10.1109/ULTSYM.2014.0599

M. Caixinha, E. Velte, Mário J. Santos, Jaime B. Santos

引用次数: 22

Ultrasonic motor for sample spinning of solid-state nuclear magnetic resonance spectrometer in high magnetic field 高磁场固体核磁共振光谱仪样品纺丝用超声电机

2014 IEEE International Ultrasonics Symposium Pub Date : 2014-10-23 DOI: 10.1109/ULTSYM.2014.0214

D. Yamaguchi, K. Suzumori, Dai Takeda, T. Kanda

引用次数: 1