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    National Tsing Hua University Institutional Repository > 電機資訊學院 > 電機工程學系 > 會議論文  >  Improved temperature imaging of focused ultrasound thermal therapy using a sigmoid model based crosscorrelation algorithm

    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/83949

    Title: Improved temperature imaging of focused ultrasound thermal therapy using a sigmoid model based crosscorrelation algorithm
    Authors: S.-M. Huang;H.-L. Liu;M.-L. Li
    教師: 李夢麟
    Date: 2012
    Publisher: Institute of Electrical and Electronics Engineers
    Relation: 2012 IEEE International Ultrasonics Symposium, Dresden, Germany, 07-10 Oct 2012
    Keywords: cross-correlation
    focused ultrasound
    sigmoid function
    temperature estimation
    thermal therapy
    Abstract: Focused ultrasound (FUS) thermal therapy relies on temperature imaging for treatment monitoring and guidance. Current ultrasonic temperature estimation mainly involves the detection of echo-time shifts using cross-correlation processing between segmented radio-frequency (RF) data pre- and post-FUS heating. Generally, a minimum RF data segment of around 6 wavelengths is required to obtain accurate echo-time shift estimates and mitigate artifacts. Shorter data segments are essential to retrieve better axial resolution in temperature image; however, shorter data segments generally lead to increased estimation errors. In this work, we propose a sigmoid model based cross-correlation algorithm to address this problem. First, cross-correlation processing with a large non-overlapping window (e.g., around 10 wavelengths) is applied to obtain coarse echo-time shift estimates between RF data pre- and post-FUS heating. According to the feature of the echo-time shift from FUS heating, a sigmoid model is adopted to fit the coarse estimates, and used as the initial estimates for the further cross-correlation processing with a smaller window (e.g., 2 wavelengths) which improves axial resolution and suppress artifacts while providing comparable noise properties to those obtained by the conventional method with a 6-wavelength window. The experimental results showed that this new method can provide accurate echo-time shift estimation and mitigate the artifacts while only requiring less than a 2-wavelength data segment. This work helps to improve axial resolution of the current ultrasonic temperature estimation used for guidance of the FUS thermal ablation procedure.
    Relation Link: http://www.ieee.org/
    URI: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/83949
    Appears in Collections:[電機工程學系] 會議論文
    [光電研究中心] 會議論文

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