Distributed Aberration Correction Techniques Based on Tomographic Sound Speed Estimates.
Distributed Aberration Correction Techniques Based on Tomographic Sound Speed Estimates.
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DOI：
10.1109/tuffc.2022.3162836
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发表时间：
2022-05
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相位畸变被广泛认为是医学脉冲回波超声中图像退化的主要来源。传统上，近场相位像差校正技术不能考虑由于介质中声音的空间变化速度而引起的分布式像差，而大多数分布式像差校正技术需要使用点状源，并且对于漫散射占主导地位的临床应用是不切实际的。在这里，我们提出了两个分布式像差校正技术，利用从层析声速估计，建立在我们以前的工作与分层介质中的漫散射的声速估计。我们首先表征我们的声速估计和分布式像差校正技术在模拟中的介质中的散射是已知的先验的性能。体模和体内实验进一步证明了声速估计器和像差校正技术的能力。在体模实验中，点目标分辨率从0.58提高到0.26和0.27 mm，病变对比度从17.7提高到23.5和25.9 dB，分别作为使用程函和波场相关技术进行分布像差校正的结果。
Phase aberration is widely considered a major source of image degradation in medical pulse-echo ultrasound. Traditionally, near-field phase aberration correction techniques are unable to account for distributed aberrations due to a spatially-varying speed of sound in the medium, while most distributed aberration correction techniques require the use of point-like sources and are impractical for clinical applications where diffuse scattering is dominant. Here, we present two distributed aberration correction techniques that utilize sound speed estimates from a tomographic sound speed estimator that builds on our previous work with diffuse scattering in layered media. We first characterize the performance of our sound speed estimator and distributed aberration correction techniques in simulations where the scattering in the media are known a-priori. Phantom and in-vivo experiments further demonstrate the capabilities of the sound speed estimator and the aberration correction techniques. In phantom experiments, point target resolution improves from 0.58 to 0.26 and 0.27 mm, and lesion contrast improves from 17.7 to 23.5 and 25.9 dB, as a result of distributed aberration correction using the eikonal and wave-field correlation techniques, respectively.