A comparison between ultrasonic array beamforming and super resolution imaging algorithms for non-destructive evaluation
A comparison between ultrasonic array beamforming and super resolution imaging algorithms for non-destructive evaluation
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DOI：
10.1016/j.ultras.2013.12.012
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发表时间：
2014-09-01
期刊：
影响因子：
4.2
通讯作者：
Drinkwater, Bruce W.
中科院分区：
文献类型：
--
作者：
Fan, Chengguang;Caleap, Mihai;Drinkwater, Bruce W.
本文比较了经典波束形成中的黄金标准--全聚焦方法和广泛使用的时间反转MUSIC超分辨技术对固体中密集散射体的分辨能力。使用模拟和实验阵列数据对算法进行了测试，每个阵列数据都包含不同的噪声水平。从横向分辨率和对噪声的敏感性两个方面对算法的性能进行了评估。结果表明，在弱噪声情况下(SNR>；20分贝)，时间反转MUSIC方法与全聚焦方法相比，横向分辨率显著提高，突破了衍射极限。然而，对于较高的噪声水平，总聚焦方法表现出较强的稳健性，而时间反转音乐的性能下降。研究了多次散射对成像算法的影响，结果表明多次散射对成像算法的影响很小。(C)2014年提交人。爱思唯尔出版公司(Elsevier B.V.)
In this paper the total focusing method, the so called gold standard in classical beamforming, is compared with the widely used time-reversal MUSIC super resolution technique in terms of its ability to resolve closely spaced scatterers in a solid. The algorithms are tested with simulated and experimental array data, each containing different noise levels. The performance of the algorithms is evaluated in terms of lateral resolution and sensitivity to noise. It is shown that for the weak noise situation (SNR > 20 dB), time-reversal MUSIC provides significantly enhanced lateral resolution when compared to the total focusing method, breaking the diffraction limit. However, for higher noise levels, the total focusing method is shown to be robust, whilst the performance of time-reversal MUSIC is degraded. The influence of multiple scattering on the imaging algorithms is also investigated and shown to be small. (C) 2014 The Authors. Published by Elsevier B.V.