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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Evaluating the Improvement in Shear Wave Speed Image Quality Using Multidimensional Directional Filters in the Presence of Reflection Artifacts
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Evaluating the Improvement in Shear Wave Speed Image Quality Using Multidimensional Directional Filters in the Presence of Reflection Artifacts

机译：在存在反射伪像的情况下，使用多维定向滤波器评估剪切波速度图像质量的改善

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摘要

Shear waves propagating through interfaces where there is a change in stiffness cause reflected waves that can lead to artifacts in shear wave speed (SWS) reconstructions. Two-dimensional (2-D) directional filters are commonly used to reduce in-plane reflected waves; however, SWS artifacts arise from both in- and out-of-imaging-plane reflected waves. Herein, we introduce 3-D shear wave reconstruction methods as an extension of the previous 2-D estimation methods and quantify the reduction in image artifacts through the use of volumetric SWS monitoring and 4-D-directional filters. A Gaussian acoustic radiation force impulse excitation was simulated in phantoms with Young’s modulus ( ) of 3 kPa and a 5-mm spherical lesion with , 12, or 18.75 kPa. The 2-D-, 3-D-, and 4-D-directional filters were applied to the displacement profiles to reduce in-and out-of-plane reflected wave artifacts. Contrast-to-noise ratio and SWS bias within the lesion were calculated for each reconstructed SWS image to evaluate the image quality. For 2-D SWS image reconstructions, the 3-D-directional filters showed greater improvements in image quality than the 2-D filters, and the 4-D-directional filters showed marginal improvement over the 3-D filters. Although 4-D-directional filters can further reduce the impact of large magnitude out-of-plane reflection artifacts in SWS images, computational overhead and transducer costs to acquire 3-D data may outweigh the modest improvements in image quality. The 4-D-directional filters have the largest impact in reducing reflection artifacts in 3-D SWS volumes.
机译：通过刚度变化的界面传播的剪切波会导致反射波，从而导致剪切波速（SWS）重建中的伪影。二维（2-D）定向滤波器通常用于减少面内反射波。但是，SWS伪影来自于成像平面内和成像平面外的反射波。在此，我们引入3-D剪切波重建方法作为先前2-D估计方法的扩展，并通过使用体积SWS监视和4-D方向滤波器来量化图像伪影的减少。在高斯模数（）为3 kPa和5毫米球形病变为，12或18.75 kPa的幻像中模拟了高斯声辐射力脉冲激励。将2-D，3-D和4-D方向滤波器应用于位移轮廓，以减少平面内和平面外的反射波伪影。对于每个重建的SWS图像，计算病变内的对比度和噪声和SWS偏差以评估图像质量。对于2-D SWS图像重建，3-D方向滤镜的图像质量比2-D滤镜更好，并且4-D方向滤镜比3-D滤镜略有改善。尽管4-D方向滤波器可以进一步减少SWS图像中大幅度面外反射伪影的影响，但是获取3-D数据的计算开销和传感器成本可能超过图像质量的适度提高。 4-D方向滤镜在减少3-D SWS体积中的反射伪影方面具有最大的影响。

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