利用稀疏采样进行多角度声速成像,描述医学组织特性

IF 3.8 2区 物理与天体物理 Q1 ACOUSTICS
Kexin Gan , Xiaoyi Jiang , Qinghong Shen, Jie Yuan, Ying Chen, Yun Ge, Yuxin Wang
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引用次数: 0

摘要

与传统的 B 型超声成像相比,医用声速(SoS)成像是一种有效的成像方法,通过量化不同的 SoS 可以更好地描述医学组织的特性。作为一种常用的诊断仪器,手持式阵列探头具有检查方便快捷的特点。然而,单角 SoS 成像会产生伪影,导致组织边界无法分辨。要建立高质量的 SoS 图像,需要大量的原始数据,这给数据存储和处理带来了困难。压缩传感(CS)理论为利用随机但采样较少的数据重建稀疏信号的可行性提供了理论支持。在这项研究中,我们提出了一种基于 CS 理论的 SoS 重建方法,用于处理从手持式线性阵列探头获得的信号,该探头的另一侧设置了一个无源反射器。SoS 重建方法由三部分组成。首先,为原始信号的稀疏表示适当选择稀疏变换基。然后,考虑到 SoS 成像的数学原理,使用射线长度矩阵作为稀疏测量矩阵来观测原始信号,它代表声波传播路径的长度。最后,引入正交匹配追寻算法进行图像重建。模型的实验结果证明,SoS 成像可以清晰地区分 B 型超声成像中回声相似的组织。模拟和实验结果表明,我们提出的方法有望在减少信号采样、传输和存储的情况下重建精确的 SoS 图像。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Multi-angle speed-of-sound imaging with sparse sampling to characterize medical tissue properties

Medical Speed-of-sound (SoS) imaging, which can characterize medical tissue properties better by quantifying their different SoS, is an effective imaging method compared with conventional B-mode ultrasound imaging. As a commonly used diagnostic instrument, a hand-held array probe features convenient and quick inspection. However, artifacts will occur in the single-angle SoS imaging, resulting in indistinguishable tissue boundaries. In order to build a high-quality SoS image, a number of raw data are needed, which will bring difficulties to data storage and processing. Compressed sensing (CS) theory offers theoretical support to the feasibility that a sparse signal can be rebuilt with random but less sampling data. In this study, we proposed an SoS reconstruction method based on CS theory to process signals obtained from a hand-held linear array probe with a passive reflector positioned on the opposite side. The SoS reconstruction method consists of three parts. Firstly, a sparse transform basis is selected appropriately for a sparse representation of the original signal. Then, considering the mathematical principles of SoS imaging, the ray-length matrix is used as a sparse measurement matrix to observe the original signal, which represents the length of the acoustic propagation path. Finally, the orthogonal matching pursuit algorithm is introduced for image reconstruction. The experimental result of the phantom proves that SoS imaging can clearly distinguish tissues that show similar echogenicity in B-mode ultrasound imaging. The simulation and experimental results show that our proposed method holds promising potential for reconstructing precision SoS images with fewer signal samplings, transmission, and storage.

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来源期刊
Ultrasonics
Ultrasonics 医学-核医学
CiteScore
7.60
自引率
19.00%
发文量
186
审稿时长
3.9 months
期刊介绍: Ultrasonics is the only internationally established journal which covers the entire field of ultrasound research and technology and all its many applications. Ultrasonics contains a variety of sections to keep readers fully informed and up-to-date on the whole spectrum of research and development throughout the world. Ultrasonics publishes papers of exceptional quality and of relevance to both academia and industry. Manuscripts in which ultrasonics is a central issue and not simply an incidental tool or minor issue, are welcomed. As well as top quality original research papers and review articles by world renowned experts, Ultrasonics also regularly features short communications, a calendar of forthcoming events and special issues dedicated to topical subjects.
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