Shear Wave Imaging of Breast Tissue by Color Doppler Shear Wave Elastography
Shear Wave Imaging of Breast Tissue by Color Doppler Shear Wave Elastography
复制标题
彩色多普勒剪切波弹性成像对乳腺组织进行剪切波成像
DOI：
10.1109/tuffc.2016.2626359
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Sunaguchi Naoki
中科院分区：
文献类型：
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作者：
Yamakoshi Yoshiki;Nakajima Takahito;Kasahara Toshihiro;Yamazaki Mayuko;Koda Ren;Sunaguchi Naoki
剪切波弹性成像是一种独特的方法，可以获得软组织的粘弹性特征，这是其他成像方式难以获得的。本文提出了一种新的乳腺组织剪切波成像方法[彩色多普勒剪切波成像(CD SWI)]。连续剪切波是由一个连接到组织表面的小型轻型致动器产生的。在彩色血流图像(CFI)上，将在组织中传播的剪切波波前重建为由零速度和最大速度组成的二值模式。不需要对超声彩色血流成像仪或高帧频超声成像仪进行任何改装即可获得横波波前图。然而，需要横波位移幅度和横波频率两个条件才能得到MAP。然而，这些条件并不是乳房成像的严格限制。这是因为对于12兆赫的超声波频率，最小位移幅度为16μm，并且可以从适合于乳房成像的几个频率中获得横波频率。沿时间轴的傅立叶分析抑制了CFI中的杂波噪声。方向滤波器提取沿正向传播的横波。利用CD SWI重建了横波相位图、速度图和传播图。通过与声辐射力脉冲法的比较，评价了均匀琼脂凝胶体模剪切波速测量的准确性。对乳腺组织的实验结果显示，当剪切波频率为296.6赫兹时。
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.