A Miniature, Broadband-Focused PVDF-TrFE PMUT With Interface ASIC for High-Resolution IVUS Imaging

IF 2.2 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Sensors Letters Pub Date : 2025-09-10 DOI:10.1109/LSENS.2025.3608669

Ruiyan Wang;Dave Dudzinski;Russell J. Fedewa;Aaron Fleischman;Steve J. A. Majerus

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Abstract

Intravascular ultrasound (IVUS) is widely used for high-resolution imaging of vascular walls and plaques. This letter presents a focused 0.8-mm aperture IVUS piezoelectric micromachined ultrasonic transducers (PMUTs) based on a polyvinylidene fluoride-co-trifluoro ethylene (PVDF-TrFE) piezoelectric copolymer, offering inherently broad bandwidth. A novel fabrication approach enabled spherical focusing on a freestanding PVDF-TrFE piezopolymer film, which was fixed in shape using conductive and acoustically inert epoxy. The PMUT, integrated with a high-voltage-tolerant analog front-end application-specific integrated circuits on a 1.5 mm width tower-shaped PCB, achieved center frequencies of 40 MHz and greater with −6 dB bandwidth of up to 92%. Pulse-echo and beam scanning confirmed the achievement of axial resolution 20 µm and lateral resolution up to 75 μm at 2.4 mm focal depth. IVUS images acquired from stent phantoms and vascular tissue clearly resolved vessel layers and stent struts, demonstrating 5 mm penetration depth and the system's suitability for miniaturized, high-resolution IVUS applications.

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用于高分辨率IVUS成像的带接口ASIC的微型宽带聚焦PVDF-TrFE PMUT

血管内超声（IVUS）广泛用于血管壁和斑块的高分辨率成像。这封信提出了聚焦0.8 mm孔径IVUS压电微机械超声换能器（PMUTs）基于聚偏氟乙烯-共三氟乙烯（PVDF-TrFE）压电共聚物，提供固有的宽带。一种新颖的制造方法使球体聚焦在独立式PVDF-TrFE压电聚合物薄膜上，该薄膜使用导电和声惰性环氧树脂固定形状。PMUT在1.5 mm宽的塔形PCB上集成了高耐压模拟前端专用集成电路，实现了40 MHz及更高的中心频率，- 6 dB带宽高达92%。脉冲回波和波束扫描证实，在2.4 mm焦深处，轴向分辨率达到20 μm，横向分辨率达到75 μm。从支架幻影和血管组织中获得的IVUS图像清晰地分辨出血管层和支架支撑，显示出5毫米的穿透深度，以及该系统适用于小型化、高分辨率IVUS应用。

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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来源期刊

IEEE Sensors Letters Engineering-Electrical and Electronic Engineering

CiteScore

3.50

自引率

7.10%

发文量

194