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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Waveform inversion with source encoding for breast sound speed reconstruction in ultrasound computed tomography
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Waveform inversion with source encoding for breast sound speed reconstruction in ultrasound computed tomography

机译：带有源编码的波形反演在超声计算机断层扫描中重建乳房声速

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摘要

Ultrasound computed tomography (USCT) holds great promise for improving the detection and management of breast cancer. Because they are based on the acoustic wave equation, waveform inversion-based reconstruction methods can produce images that possess improved spatial resolution properties over those produced by ray-based methods. However, waveform inversion methods are computationally demanding and have not been applied widely in USCT breast imaging. In this work, source encoding concepts are employed to develop an accelerated USCT reconstruction method that circumvents the large computational burden of conventional waveform inversion methods. This method, referred to as the waveform inversion with source encoding (WISE) method, encodes the measurement data using a random encoding vector and determines an estimate of the sound speed distribution by solving a stochastic optimization problem by use of a stochastic gradient descent algorithm. Both computer simulation and experimental phantom studies are conducted to demonstrate the use of the WISE method. The results suggest that the WISE method maintains the high spatial resolution of waveform inversion methods while significantly reducing the computational burden.
机译：超声计算机断层扫描（USCT）在改善乳腺癌的检测和管理方面具有广阔的前景。因为它们基于声波方程，所以基于波形反演的重建方法可以产生具有比基于射线的方法产生的空间分辨率更好的图像的图像。但是，波形反转方法对计算要求很高，在USCT乳腺成像中尚未得到广泛应用。在这项工作中，采用源编码概念来开发一种加速的USCT重建方法，该方法可以避免传统波形反演方法的大量计算负担。该方法称为源编码波形反转（WISE）方法，它使用随机编码矢量对测量数据进行编码，并通过使用随机梯度下降算法解决随机优化问题来确定声速分布的估计值。进行计算机仿真和实验幻像研究以证明WISE方法的使用。结果表明，WISE方法在保持波形反转方法的高空间分辨率的同时，大大降低了计算负担。

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