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首页> 外文期刊>Ultrasonics, Ferroelectrics and Frequency Control, IEEE Transactions on >Ultrasonic backscatter imaging by shear-wave-induced echo phase encoding of target locations
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Ultrasonic backscatter imaging by shear-wave-induced echo phase encoding of target locations

机译：通过剪切波诱导的目标位置回波相位编码进行超声反向散射成像

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摘要

We present a novel method for ultrasound backscatter image formation wherein lateral resolution of the target is obtained by using traveling shear waves to encode the lateral position of targets in the phase of the received echo. We demonstrate that the phase modulation as a function of shear wavenumber can be expressed in terms of a Fourier transform of the lateral component of the target echogenicity. The inverse transform, obtained by measurements of the phase modulation over a range of shear wave spatial frequencies, yields the lateral scatterer distribution. Range data are recovered from time of flight as in conventional ultrasound, yielding a Bmode- like image. In contrast to conventional ultrasound imaging, where mechanical or electronic focusing is used and lateral resolution is determined by aperture size and wavelength, we demonstrate that lateral resolution using the proposed method is independent of the properties of the aperture. Lateral resolution of the target is achieved using a stationary, unfocused, single-element transducer. We present simulated images of targets of uniform and non-uniform shear modulus. Compounding for speckle reduction is demonstrated. Finally, we demonstrate image formation with an unfocused transducer in gelatin phantoms of uniform shear modulus.
机译：我们提出了一种新的超声反向散射图像形成方法，其中目标的横向分辨率是通过使用行进的剪切波在接收到的回波相位中编码目标的横向位置而获得的。我们证明相位调制作为切变波数的函数可以表示为目标回波性的横向分量的傅立叶变换。通过在一定范围内的剪切波空间频率上测量相位调制而获得的逆变换会产生横向散射体分布。像常规超声一样从飞行时间中恢复距离数据，从而产生类似Bmode的图像。与传统的超声成像相比，在传统的超声成像中使用机械或电子聚焦，并且横向分辨率由孔径大小和波长确定，我们证明了所提出的方法的横向分辨率与孔径的特性无关。使用固定的，未聚焦的单元素换能器可实现目标的横向分辨率。我们提出了均匀和非均匀剪切模量目标的模拟图像。证明了减少斑点的复合。最后，我们证明了在均匀剪切模量的明胶体模中使用未聚焦换能器的图像形成。

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