Enhanced Row–Column-Addressed Array Imaging With Retrospective Filtering

IF 2.9
Chung-Shiang Mei;Wei-Hsiang Shen;Meng-Lin Li
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Abstract

To address the inherent complexity associated with fabricating fully-sampled (FS) 2-D arrays, row-column-addressed (RCA) arrays offer a promising alternative by significantly reducing the number of active elements. However, RCA arrays are limited by reduced image quality, as they only allow one-way focusing along both the x- and y-axes. This study introduces a post-filtering scheme that leverages a retrospective filtering method combined with filter-derived coherence-index (FCI) weighting to enhance RCA focusing quality, aiming to emulate the performance of FS arrays. Preliminary simulations were conducted to assess the efficacy of this approach, including point spread function (PSF) analysis and anechoic vessel phantom imaging. In the PSF analysis, our method achieved a 14.63-dB reduction in the sidelobe level, with improvements of 11.3% and 14.29% observed in the -6 dB and -20 dB full-width at half-maximum (FWHM), respectively. For anechoic vessel phantom imaging, the proposed scheme demonstrated substantial gains, with a 15.77 dB enhancement in contrast ratio (CR), a 1.615 increase in contrast-to-noise ratio (CNR), and a 27.03% improvement in generalized contrast-to-noise ratio (gCNR).
增强行-列寻址阵列成像回顾性滤波
为了解决与制造全采样(FS)二维阵列相关的固有复杂性,行-列寻址(RCA)阵列通过显着减少有源元件的数量提供了一个有前途的替代方案。然而,RCA阵列受到图像质量降低的限制,因为它们只允许沿x轴和y轴单向聚焦。本研究引入了一种后滤波方案,该方案利用回溯滤波方法结合滤波器衍生相干指数(FCI)加权来提高RCA聚焦质量,旨在模拟FS阵列的性能。进行了初步模拟以评估该方法的有效性,包括点扩散函数(PSF)分析和消声血管影成像。在PSF分析中,我们的方法使旁瓣电平降低了14.63 dB,在半最大值(FWHM)的-6 dB和-20 dB全宽分别提高了11.3%和14.29%。对于无回声血管影成像,该方案显示出显著的增益,对比度(CR)提高15.77 dB,对比噪声比(CNR)提高1.615,广义对比噪声比(gCNR)提高27.03%。
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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