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首页> 外文期刊>Journal of Digital Imaging >A Nonrigid Registration of MR Breast Images Using Complex-valued Wavelet Transform
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A Nonrigid Registration of MR Breast Images Using Complex-valued Wavelet Transform

机译：MR乳房图像的非刚性配准的复值小波变换

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摘要

In this paper, a fast, slice-by-slice, nonrigid registration algorithm of dynamic magnetic resonance breast images is presented. The method is based on a multiresolution motion estimation of the breast using complex discrete wavelet transform (CDWT): the pyramid of oriented complex subimages is used to implement a hierarchical phase-matching-based motion estimation algorithm. The resulting motion estimate is nonrigid and pixel-independent. To assess the method performance, we computed the correlation coefficient and the normalized mutual information between pre- and postcontrast images with and without realignment. The indices increased after using our approach and the improvement was superior to rigid or affine registration. A set of clinical scores was also evaluated. The clinical validation demonstrated an increased readability in the subtraction images. In particular, CDWT registration allowed a best definition of breast and lesion borders and greater detail detectability.
机译：本文提出了一种动态，快速，动态的乳房磁共振图像逐层非刚性配准算法。该方法基于使用复杂离散小波变换（CDWT）的乳房多分辨率运动估计：定向复杂子图像的金字塔用于实现基于分层相位匹配的运动估计算法。所得的运动估计是非刚性的并且与像素无关。为了评估方法的性能，我们计算了在有和没有重新对齐的情况下，对比前后图像之间的相关系数和标准化互信息。使用我们的方法后，指数增加，并且改进优于刚性或仿射配准。还评估了一组临床评分。临床验证表明减影图像具有更高的可读性。特别是，CDWT配准可以对乳腺和病变边界进行最佳定义，并可以更好地检测细节。

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  • 来源
    《Journal of Digital Imaging》 |2008年第1期|27-36|共10页
  • 作者

    L. Mainardi; K. M. Passera; A. Lucesoli; D. Vergnaghi; G. Trecate; E. Setti; R. Musumeci; S. Cerutti;

  • 作者单位

    Department of Biomedical Engineering Polytechnic University of Milan Piazza Leonardo da Vinci 32 20133 Milan Italy;

    Department of Biomedical Engineering Polytechnic University of Milan Piazza Leonardo da Vinci 32 20133 Milan Italy;

    Department of Electromagnetism and Bioengineering Marche Polytechnic University Ancona Italy;

    Department of Imaging Diagnosis and Radiotherapy National Cancer Institute of Milan Milan Italy;

    Department of Imaging Diagnosis and Radiotherapy National Cancer Institute of Milan Milan Italy;

    Department of Imaging Diagnosis and Radiotherapy National Cancer Institute of Milan Milan Italy;

    Department of Biomedical Engineering Polytechnic University of Milan Piazza Leonardo da Vinci 32 20133 Milan Italy;

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  • 正文语种 eng
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  • 关键词

    Breast; magnetic resonance; contrast agent; registration algorithm; nonrigid; wavelet transform;

    机译：乳房;磁共振;造影剂;配准算法;非刚性;小波变换;

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