Shear Wave Imaging of Breast Tissue by Color Doppler Shear Wave Elastography

Yoshiki Yamakoshi; Takahito Nakajima; Toshihiro Kasahara; Mayuko Yamazaki; Ren Koda; Naoki Sunaguchi

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Shear Wave Imaging of Breast Tissue by Color Doppler Shear Wave Elastography

机译：彩色多普勒剪切波弹性成像对乳腺组织的剪切波成像

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摘要

Shear wave elastography is a distinctive method to access the viscoelastic characteristic of the soft tissue that is difficult to obtain by other imaging modalities. This paper proposes a novel shear wave elastography [color Doppler shear wave imaging (CD SWI)] for breast tissue. Continuous shear wave is produced by a small lightweight actuator, which is attached to the tissue surface. Shear wave wavefront that propagates in tissue is reconstructed as a binary pattern that consists of zero and the maximum flow velocities on color flow image (CFI). Neither any modifications of the ultrasound color flow imaging instrument nor a high frame rate ultrasound imaging instrument is required to obtain the shear wave wavefront map. However, two conditions of shear wave displacement amplitude and shear wave frequency are needed to obtain the map. However, these conditions are not severe restrictions in breast imaging. This is because the minimum displacement amplitude is 16 μm for an ultrasonic wave frequency of 12 MHz and the shear wave frequency is available from several frequencies suited for breast imaging. Fourier analysis along time axis suppresses clutter noise in CFI. A directional filter extracts shear wave, which propagates in the forward direction. Several maps, such as shear wave phase, velocity, and propagation maps, are reconstructed by CD SWI. The accuracy of shear wave velocity measurement is evaluated for homogeneous agar gel phantom by comparing with the acoustic radiation force impulse method. The experimental results for breast tissue are shown for a shear wave frequency of 296.6 Hz.

机译：剪切波弹性成像是一种独特的方法，可以访问软组织的粘弹性特性，而其他成像方式很难获得这种特性。本文提出了一种用于乳腺组织的新型剪切波弹性成像技术[彩色多普勒剪切波成像（CD SWI）]。连续的剪切波由附着在组织表面的小型轻型致动器产生。在组织中传播的剪切波波前被重建为二进制模式，该模式由零和彩色流图像（CFI）上的最大流速组成。不需要对超声彩色流成像仪或高帧频超声成像仪进行任何修改以获得剪切波波前图。但是，需要两个条件，即剪切波位移幅度和剪切波频率才能获得该图。但是，这些条件在乳房成像中并不是严格的限制。这是因为，对于12 MHz的超声波频率，最小位移幅度为16μm，并且可以从几种适合乳房成像的频率中获得剪切波频率。沿时间轴的傅立叶分析可抑制CFI中的杂波噪声。定向滤波器提取剪切波，该剪切波在正向传播。 CD SWI重建了几个图，如剪切波相位，速度和传播图。通过与声辐射力脉冲法比较，评估了均相琼脂凝胶体模的剪切波速度测量的准确性。显示了针对乳腺组织的实验结果，其剪切波频率为296.6 Hz。

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来源
《IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control》 |2017年第2期|340-348|共9页
作者
Yoshiki Yamakoshi; Takahito Nakajima; Toshihiro Kasahara; Mayuko Yamazaki; Ren Koda; Naoki Sunaguchi;
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作者单位

Graduate School of Science and Technology, Gunma University, Gunma, Japan;

Department of Medicine, Gunma University, Gunma, Japan;

Graduate School of Science and Technology, Gunma University, Gunma, Japan;

Graduate School of Science and Technology, Gunma University, Gunma, Japan;

Graduate School of Science and Technology, Gunma University, Gunma, Japan;

Graduate School of Science and Technology, Gunma University, Gunma, Japan;

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正文语种 eng
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关键词
Acoustics; Ultrasonic imaging; Breast; Frequency control; Image color analysis; Elastography;

机译：声学;超声成像;乳腺;频率控制;图像颜色分析;弹性成像;

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Shear Wave Imaging of Breast Tissue by Color Doppler Shear Wave Elastography

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