National Tsing Hua University Institutional Repository:Improved plane-wave high frame rate imaging using retrospective transmit focusing and filter-derived coherence-index weighting
English  |  正體中文  |  简体中文  |  全文笔数/总笔数 : 54367/62174 (87%)
造访人次 : 14250781      在线人数 : 43
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  >  Improved plane-wave high frame rate imaging using retrospective transmit focusing and filter-derived coherence-index weighting


    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/987654321/83961


    题名: Improved plane-wave high frame rate imaging using retrospective transmit focusing and filter-derived coherence-index weighting
    作者: C.-L. Hu;G.-S. Jeng;Y.-H. Wang;P.-C. Li;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: plane-wave
    retrospective transmit
    coherence-index weighting
    摘要: Recently, a wide spectrum of new applications in biomedical ultrasound such as real time 3D ultrasound and transient elastography has triggered the need of high frame-rate imaging. One of the methods to achieve high frame-rate imaging is to use plane wave excitation (PWE) with which a single insonification is sufficient to form an image. However, due to the lack of transmit focusing, the signal-to-noise-ratio (SNR), contrast, and spatial resolution of the resultant images are lower compared with a conventional focused transmission. To solve this problem, we propose a filter-based retrospective focusing technique combined with filter-derived coherence-index weighting (FRF+FCI weighting) for high frame-rate imaging with PWE. A 2-D filter is designed and applied to beamformed baseband data to retrieve transmit focusing. Then a filter-derived coherence index (FCI) at each imaging point is used as a weighting factor to further improve the filter-retrieved focusing quality. Here FCI is a coherence measure of the filtered signal samples in the sliding filter kernel, Due to the sidelobe-suppression nature of the designed 2-D filter, FCIs are low at sidelobes; thus FCI weighting can further suppress the sidelobes in the filtered signal samples. Simulation results demonstrated that our proposed FRF+FCI weighting technique can enhance the image quality of high frame-rate imaging with single PWE reducing the sidelobes, and improving the SNR and spatial resolution while being capable of retaining the high frame rate. Since it is applied over high frame-rate imaging with single PWE, FRF+FCI weighting performed after beamforming is inherently insusceptible to motion artifacts. In addition, coded excitation techniques can be integrated into our technique to further improve SNR.
    相関连結: http://www.ieee.org/
    URI: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/83961
    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.html0KbHTML1057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