2010 IEEE International Ultrasonics Symposium最新文献_第6页

The effects of image degradation on ultrasound-guided HIFU 图像退化对超声引导HIFU的影响

2010 IEEE International Ultrasonics Symposium Pub Date : 2010-10-01 DOI: 10.1109/ULTSYM.2010.5935951

J. Dahl, G. Trahey, G. Pinton

{"title":"The effects of image degradation on ultrasound-guided HIFU","authors":"J. Dahl, G. Trahey, G. Pinton","doi":"10.1109/ULTSYM.2010.5935951","DOIUrl":"https://doi.org/10.1109/ULTSYM.2010.5935951","url":null,"abstract":"High-intensity focused ultrasound (HIFU) has recently found a wide range of applications. In the case of ultrasound-guided HIFU, clutter and phase-aberration can degrade the image quality such that visualization of the target can be significantly diminished. In this case the quality of the HIFU intensity deposition can be unknown. We modeled an 8 cm, 1.5 MHz HIFU array and a 6 cm, 2.5 MHz imaging array with propagation of acoustic waves through a histological characterization of the human abdominal layer using a nonlinear, full-wave simulation method. Modifications were made to the simulated medium in order to assess the impact of the individual image degradation mechanisms on intensity. For small targets (5 mm diameter lesions), the addition of a 3 cm thick abdominal layer completely obscured the imaging target positioned at 5 cm depth, however, the deposition of HIFU intensity was not significantly degraded. An average elongation of 0.5mm of the intensity distribution was produced with the abdominal layer, and the location of the peak focal intensity moved approximately 0.03mm laterally and 0.9 mm axially. The average peak focal intensity dropped 0.6dB compared to the homogeneous tissue case, despite the presence of strong phase aberration and reverberation clutter. The intensity distribution returned nearly to normal when the phase aberration effects were removed and remained relatively unchanged when reverberation clutter was removed.","PeriodicalId":6437,"journal":{"name":"2010 IEEE International Ultrasonics Symposium","volume":"59 1","pages":"809-812"},"PeriodicalIF":0.0,"publicationDate":"2010-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82998845","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

Langasite SAW device with gas-sensitive layer 带有气敏层的Langasite SAW装置

2010 IEEE International Ultrasonics Symposium Pub Date : 2010-10-01 DOI: 10.1109/ULTSYM.2010.5935779

P. Zheng, T.-L. Chin, D. Greve, I. Oppenheim, V. Malone, T. Ashok, J. Miller, L. Cao

引用次数: 13

Impact of the structure of subcutaneous tissue on ultrasonic clutter 皮下组织结构对超声杂波的影响

2010 IEEE International Ultrasonics Symposium Pub Date : 2010-10-01 DOI: 10.1109/ULTSYM.2010.5935847

J. Dahl

{"title":"Impact of the structure of subcutaneous tissue on ultrasonic clutter","authors":"J. Dahl","doi":"10.1109/ULTSYM.2010.5935847","DOIUrl":"https://doi.org/10.1109/ULTSYM.2010.5935847","url":null,"abstract":"Subcutaneous tissue is often associated with ultrasonic clutter and phase aberration. However, the complexities of subcutaneous tissue are often replaced by far simpler models in phase aberration, and are not well defined in the case of ultrasonic clutter. We employed a nonlinear, full-wave simulation method to compare the impact of subcutaneous tissue structure on ultrasonic clutter. Simplified models of male and female connective tissue networks were created, including networks with varying degrees of fascial layer density and angles relative to the transducer probe. The models were given the speed of sound, density, and attenuation appropriate for the associated fat and connective tissue. The amount of ultrasonic clutter depended on the density and angle of the fascial layers, although the two factors were not necessarily independent. Increases in the density and angle of the fascial layers increased the magnitude of clutter. Differences were observed between the female and subcutaneous tissue structures, yielding approximately 3 to 15 dB higher clutter magnitude in the male structure. The human abdominal models generated relatively high clutter magnitude, ranging from near 0dB just beneath the abdominal layer to approximately −33dB and −27 dB for the two models. In these realistic models of human abdominal tissue, the high density of fascial layers increased the number of multipath reflections contributing to the clutter, and generated high clutter magnitude.","PeriodicalId":6437,"journal":{"name":"2010 IEEE International Ultrasonics Symposium","volume":"61 1","pages":"2167-2170"},"PeriodicalIF":0.0,"publicationDate":"2010-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84023789","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

Single-mode ring waveguide resonator on SAW SAW单模环形波导谐振器

2010 IEEE International Ultrasonics Symposium Pub Date : 2010-10-01 DOI: 10.1109/ULTSYM.2010.5935471

S. Biryukov, H. Schmidt, M. Weihnacht

引用次数: 3

Comparison of different schemes of synthetic transmit aperture using an ultrasound advanced open platform (ULA-OP) 超声先进开放平台(ULA-OP)不同合成透射孔径方案的比较

2010 IEEE International Ultrasonics Symposium Pub Date : 2010-10-01 DOI: 10.1109/ULTSYM.2010.5935656

M. Lewandowski, Z. Klimonda, P. Karwat, M. Seklewski, A. Nowicki, L. Bassi, P. Tortoli

引用次数: 5

Lithium niobate ultrasound transducers for high-resolution focused ultrasound surgery 用于高分辨率聚焦超声手术的铌酸锂超声换能器

2010 IEEE International Ultrasonics Symposium Pub Date : 2010-10-01 DOI: 10.1109/ULTSYM.2010.5935943

S. Kotopoulis, Han Wang, S. Cochran, M. Postema

{"title":"Lithium niobate ultrasound transducers for high-resolution focused ultrasound surgery","authors":"S. Kotopoulis, Han Wang, S. Cochran, M. Postema","doi":"10.1109/ULTSYM.2010.5935943","DOIUrl":"https://doi.org/10.1109/ULTSYM.2010.5935943","url":null,"abstract":"Focused ultrasound surgery (FUS) is usually based on frequencies below 5 MHz, typically around 1 MHz. Whilst this allows good penetration into tissue, it limits the minimum lesion dimensions that can be achieved. In the study reported here, we investigated devices to allow FUS at much higher frequencies, therefore in principle reducing the minimum lesion dimensions. We explain the methodology we have used to build high-frequency high-intensity transducers using Y-36° cut lithium niobate. This material was chosen as its low losses give it the potential to allow very high-frequency operation at harmonics of the fundamental operating frequency. A range of single element transducers with a centre frequency between 6.6 MHz and 20.0 MHz was built and the transducers' efficiency and acoustic power output were measured. A focussed 6.6-MHz transducer was built with multiple elements operated together and tested using an ultrasound phantom and MRI scans. It was shown to increase phantom temperature by 32°C in a localised area of 2.5 mm × 3.4 mm in the plane of the MRI scan. This study therefore demonstrates that it is feasible to produce high-frequency transducers capable of high-resolution focused ultrasound surgery using lithium niobate.","PeriodicalId":6437,"journal":{"name":"2010 IEEE International Ultrasonics Symposium","volume":"21 2","pages":"72-75"},"PeriodicalIF":0.0,"publicationDate":"2010-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72825295","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

Measuring the speed of surface waves in a two-layer gelatin phantom in water 测量水中两层凝胶体表面波的速度

2010 IEEE International Ultrasonics Symposium Pub Date : 2010-10-01 DOI: 10.1109/ULTSYM.2010.5935728

B. Qiang, J. Greenleaf, Xiaoming Zhang

引用次数: 1

Simultaneous imaging of tissue motion and flow velocity using 2D phase-coupled speckle tracking 利用二维相位耦合散斑跟踪同时成像组织运动和流速

2010 IEEE International Ultrasonics Symposium Pub Date : 2010-10-01 DOI: 10.1109/ULTSYM.2010.5935812

Y. Wan, Dalong Liu, E. Ebbini

{"title":"Simultaneous imaging of tissue motion and flow velocity using 2D phase-coupled speckle tracking","authors":"Y. Wan, Dalong Liu, E. Ebbini","doi":"10.1109/ULTSYM.2010.5935812","DOIUrl":"https://doi.org/10.1109/ULTSYM.2010.5935812","url":null,"abstract":"We introduce a new method for simultaneous imaging of tissue motion and flow with subsample accuracy in both axial and lateral directions. The method utilizes a phase-coupled 2D speckle tracking approach, which employs the true 2D complex cross correlation to find subpixel displacements in both axial and lateral directions. We have also modified the imaging sequence on a Sonix RP scanner to allow high frame rate 2D data collection in a limited field of view covering the region of interest (M2D-mode). Together with the robust 2D speckle tracking method, M2D imaging allows for capturing the full dynamics of the flow and wall/tissue motion, even when the flow is primarily in the lateral direction (with respect to the imaging beam). The fine vector displacement estimates in both axial and lateral directions are shown to allow for smooth and contiguous strain and shear strain calculations with minimal filtering. The quality of the displacement and strain fields is demonstrated by experimental results from a flow phantom (ATS Model 524) and in vivo images of the carotid artery in a healthy volunteer. The results clearly demonstrate the feasibility of simultaneous imaging of the vector flow field and the wall/tissue motion and the corresponding strains at high spatial and temporal sampling. This may provide an essential tool in modeling the fluid-solid interactions between the blood and blood vessel, a key challenge in vascular biomechanics.","PeriodicalId":6437,"journal":{"name":"2010 IEEE International Ultrasonics Symposium","volume":"33 1","pages":"487-490"},"PeriodicalIF":0.0,"publicationDate":"2010-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76807694","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: 7

Retrospective PW-Doppler based on spatiotemporal adaptive signal processing 基于时空自适应信号处理的pw -多普勒回顾性分析

2010 IEEE International Ultrasonics Symposium Pub Date : 2010-10-01 DOI: 10.1109/ULTSYM.2010.5935737

I. Ekroll, H. Torp, L. Løvstakken

引用次数: 0

A taper microstructure for impedance matching 用于阻抗匹配的锥度微结构

2010 IEEE International Ultrasonics Symposium Pub Date : 2010-10-01 DOI: 10.1109/ULTSYM.2010.5935687

Dawei Wu, P. Harris, R. Young

引用次数: 2