新型电子扫描技术让超声阵列成像更清晰，突破传统限制。
Bias-Switchable Row-Column Array Imaging using Fast Orthogonal Row-Column Electronic Scanning (FORCES) Compared with Conventional Row-Column Array Imaging
- 采用快速正交扫描技术，实现高精度电子聚焦成像。
- 在体模中分辨率提升21%，gCNR提高37%以上。
- 适合需要高质量三维超声的临床与科研场景。
行-列阵（RCAs）因其布线简化，是三维超声的有吸引力替代方案。然而传统RCAs因长元件存在缺陷：无法穿透孔径阴影区，且难以在发射与接收时同时聚焦于目标扫描平面。为此，我们开发了可切换偏置的行-列阵，即上下电极正交（TOBE）阵列，实现了对每个阵元的独立读出，显著提升成像质量。尽管TOBE阵列及其成像方法已展现潜力，但尚未与传统RCAs进行实验对比。本研究通过快速正交行-列电子扫描（FORCES）技术，在两个电致伸缩弛豫型TOBE阵列上，与倾斜平面波复合（TPW）及虚拟线源（VLS）成像进行直接比较。结果表明，FORCES在体模中实现更高分辨率与更强的广义对比噪声比（gCNR），分别提升21%与37%以上，并成功完成体模与动物模型的三维成像。
原文摘要 · Abstract (English)
Row-Column Arrays (RCAs) offer an attractive alternative to fully wired 2D-arrays for 3D-ultrasound, due to their greatly simplified wiring. However, conventional RCAs face challenges related to their long elements. These include an inability to image beyond the shadow of the aperture and an inability to focus in both transmit and receive for desired scan planes. To address these limitations, we recently developed bias-switchable RCAs, also known as Top Orthogonal to Bottom Electrode (TOBE) arrays. These arrays provide novel opportunities to read out from every element of the array and achieve high-quality images. While TOBE arrays and their associated imaging schemes have shown promise, they have not yet been directly compared experimentally to conventional RCA imaging techniques. This study aims to provide such a comparison, demonstrating superior B-scan and volumetric images from two electrostrictive relaxor TOBE arrays, using a method called Fast Orthogonal Row-Column Electronic scanning (FORCES), compared to conventional RCA imaging schemes, including Tilted Plane Wave (TPW) compounding and Virtual Line Source (VLS) imaging. The study quantifies resolution and Generalized Contrast to Noise Ratio (gCNR) in phantoms, and also demonstrates volumetric acquisitions in phantom and animal models.
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