Data-Adaptive Similarity Measures for B-mode Ultrasound Images Using Robust Noise Models

作     者：Ouzir, Nora Ollila, Esa Vorobyov, Sergiy A. 

作者机构：Aalto Univ Dept Signal Proc & Acoust Espoo Finland 

出 版 物：《IEEE JOURNAL OF SELECTED TOPICS IN SIGNAL PROCESSING》 (IEEE信号处理选题杂志)

年 卷 期：2020年第14卷第6期

页      面：1244-1254页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 

主　　题：Similarity measures ultrasound heavy-tailed distributions motion estimation t-distribution Nakagami-Gamma distribution data-adaptive 

摘      要：Ultrasound imaging (UI) is characterized by the presence of multiplicative speckle noise and various acquisition artefacts. Designing ultrasound (US) similarity measures thus requires a particular attention. In the specific context of motion estimation, incorporating US characteristics does not only benefit traditional methods but also learning-based approaches, which are highly sensitive to the quality of training data. Deriving similarity measures from a maximum likelihood (ML) perspective allows us to take these specificities into account. As opposed to the classical Rayleigh modelling, the proposed similarity measures incorporate more realistic scattering conditions, such as, varying speckle densities and shadowing. Specifically, the deviations from the Rayleigh statistics are modelled using the t-distribution for the complex radio-frequency (RF) signals and the Nakagami-Gamma (NG) compound model for the echo amplitudes. Furthermore, the model parameters are learnt patch-wise, which leads to data-adaptive similarity measures. The proposed criteria are investigated in the context of motion estimation using synthetic, phantom, as well as 2D and 3D in vivo images. The experimental results show an improvement in performance and robustness in comparison to the classical Rayleigh-based approach and state-of-the-art similarity measures.