Shao Dangguo, Zhong Ming, Liu Dong C
a Faculty of Information Engineering and Automation, KunMing University of Science and Technology , KunMing , P.R. China.
Comput Methods Biomech Biomed Engin. 2015;18(4):376-81. doi: 10.1080/10255842.2013.803080. Epub 2013 Jun 28.
Elastography in medical ultrasound is an imaging technique that displays information about tissue stiffness. However, elastography suffers from artefact noise that may come from two dominant sources: decorrelation error and amplitude modulation error. In order to reduce artefact and improve the quality of ultrasonic elastography, a fast bilateral filter is proposed in this study based on local histogram. The presented filter is derived from a conventional bilateral filter, and a local histogram is introduced to speed up the filter. The proposed algorithm can reduce artefact noise and, at the same time, maintain the tissue structure. Both simulation and phantom testing show that the proposed method can improve the quality of ultrasonic elastography in terms of tissue elastographic signal-to-noise ratio and elastographic contrast-to-noise ratio values.
医学超声中的弹性成像技术是一种显示组织硬度信息的成像技术。然而，弹性成像存在伪像噪声，其可能来自两个主要来源：去相关误差和幅度调制误差。为了减少伪像并提高超声弹性成像的质量，本研究基于局部直方图提出了一种快速双边滤波器。所提出的滤波器源自传统双边滤波器，并引入局部直方图以加快滤波器速度。该算法可以减少伪像噪声，同时保持组织结构。仿真和体模测试均表明，该方法在组织弹性成像信噪比和弹性成像对比噪声比值方面能够提高超声弹性成像的质量。
