National Tsing Hua University Institutional Repository:High frame-rate vector flow estimation using speckle tracking with recursive plane-wave compounding
English  |  正體中文  |  简体中文  |  全文笔数/总笔数 : 54367/62174 (87%)
造访人次 : 13862909      在线人数 : 186
RC Version 6.0 © Powered By DSPACE, MIT. Enhanced by NTHU Library IR team.
搜寻范围 查询小技巧:
  • 您可在西文检索词汇前后加上"双引号",以获取较精准的检索结果
  • 若欲以作者姓名搜寻,建议至进阶搜寻限定作者字段,可获得较完整数据
  • 进阶搜寻
    National Tsing Hua University Institutional Repository > 電機資訊學院 > 電機工程學系 > 會議論文  >  High frame-rate vector flow estimation using speckle tracking with recursive plane-wave compounding


    jsp.display-item.identifier=請使用永久網址來引用或連結此文件: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/83960


    题名: High frame-rate vector flow estimation using speckle tracking with recursive plane-wave compounding
    作者: C.-C. Shen;M.-Y. Pan;M.-L. Li
    教師: 李夢麟
    日期: 2010
    出版者: Institute of Electrical and Electronics Engineers
    關聯: 2010 IEEE International Ultrasonics Symposium, San Diego, California, 11-14 Oct. 2010
    关键词: High frame-rate vector flow estimation
    speckle tracking
    plane-wave
    摘要: Speckle tracking is capable of searching the complete vector velocity but is susceptible to the frame-to-frame image decorrelation. With plane-wave excitation (PWE), the high frame-rate reduces the scatterer displacement and thus increases the signal correlation. Nevertheless, the lower image quality with PWE may suffer from spatial velocity gradient outside the sample volume and reduce the achievable accuracy of speckle tracking. In this study, we propose a recursive PWE compounding technique to improve the image quality for accuracy of vector velocity estimation while the high-frame-rate nature of PWE for vector velocity estimation is retained. In the proposed compounding, several PWE images from different steering angles are combined coherently to suppress the beam sidelobes at the cost of longer acquisition time. The coherent PWE compounding is further combined with a recursive technique to generate high-resolution images with different features at a frame rate of pulse repetition frequency; thus retaining the high frame-rate nature. The neighboring high-resolution image pairs with the same image feature are utilized for velocity detection with speckle tracking. Extensive simulations were performed to test the recursive PWE compounding method for its performance in speckle-tracking based vector velocity estimation. Results indicate that, the lateral estimation is more susceptible to the spatial flow velocity gradient than the axial estimation is. When the Doppler angle is 0°, it is shown that the mean axial velocity remains close to the ideal parabolic profile while the detection of lateral velocity is markedly interfered by the flow gradient. In the case of large Doppler angle, it is also evident that an accurate lateral estimation is achieved with the coherent PWE compounding method. Note that the standard deviation with the PWE compounding is generally smaller as compared to the conventional PWE image, indicating the improved robustness in both latera- - l and axial estimation. Nevertheless, the error of lateral estimation is still larger than that of axial estimation. It is demonstrated that the recursive PWE compounding with speckle tracking is capable of improving estimation of vector velocity with high frame rate. In addition to vector velocity estimation, the proposed method can also be potentially applied to elastography.
    相関连結: http://www.ieee.org/
    URI: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/83960
    显示于类别:[電機工程學系] 會議論文
    [光電研究中心] 會議論文

    文件中的档案:

    档案 描述 大小格式浏览次数
    index.html0KbHTML811检视/开启


    在NTHUR中所有的資料項目都受到原著作權保護,僅提供學術研究及教育使用,敬請尊重著作權人之權益。若須利用於商業或營利,請先取得著作權人授權。
    若發現本網站收錄之內容有侵害著作權人權益之情事,請權利人通知本網站管理者(smluo@lib.nthu.edu.tw),管理者將立即採取移除該內容等補救措施。

    SFX Query

    與系統管理員聯絡

    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - 回馈