Travel-Time Tomography for Local Sound Speed Reconstruction Using Average Sound Speeds

Rehman Ali, J. Dahl
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引用次数: 9

Abstract

Our previous work on estimating the local speed of sound from average sound speed assumes a perfectly layered medium where sound speed is only allowed to vary axially away from the transducer surface. This layered-medium approach relies on inverting the relationship between the local interval sound speeds in each layer and the effective average sound speed up to a particular imaging depth. The primary limitation of this approach is that local sound speed estimation can become inaccurate in the presence of lateral variations in sound speed or a curved transducer surface. To better estimate sound speed in the presence of these non-idealities, we propose a travel-time tomographic approach that accounts for propagation paths from the scattering volume to each transducer element.
利用平均声速重建局部声速的走时层析成像
我们之前从平均声速估计局部声速的工作假设了一个完美的分层介质,其中声速只允许在远离换能器表面的轴向变化。这种分层介质方法依赖于反演每层的局部间隔声速与特定成像深度的有效平均声速之间的关系。这种方法的主要限制是,在声速横向变化或弯曲的换能器表面存在时,局部声速估计可能变得不准确。为了在存在这些非理想情况下更好地估计声速,我们提出了一种旅行时层析方法,该方法考虑了从散射体到每个换能器元件的传播路径。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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