SBIR Phase I:A New High-Strain Material for Medical Ultrasound Transducers

SBIR第一期：用于医用超声换能器的新型高应变材料

• 批准号: 0339430
• 负责人: Frank Djuth
• 金额: $ 10万
• 依托单位: Geospace Research Inc
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-01-01 至 2004-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0339430&HistoricalAwards=false
• 关键词: SBIR; Phase; New; Strain; Material

This Small Business Innovation Research Phase I project is aimed at engineering a high-strain piezoelectric material for use in medical ultrasound transducers. The proposed work entails investigations of the relaxor ferroelectric Pb(Yb0.5Nb0.5)O3-PbTiO3 (PYbN-PT). A major increase in the d31 and d33 piezoelectric coefficients can be realized by growing rhombohedral PYbN-PT crystals along the pseudocubic 001 orientation. The objective is to attain the benefits of 001 oriented single crystals, but to do so via the sol-gel thin film method. Our initial research in the area of relaxor ferroelectrics shows that PYbN-PT has significantly higher strain than lead zirconate titanate (PZT), the mainstay material of high performance transducers. In addition, the new film has many other desirable features of PZT. In Phase I, PYnB-PT will be developed and fully characterized for use in medical ultrasound. To be useful for medical ultrasound purposes, a PYbN-PT film thickness of at least 3-4 microns must be achieved. The proposed Phase I optimization study should be able to increase ultrasound system selectivity by more than one order of magnitude.The commercial application of this project is in the field of medical ultrasound imaging. The PYbN-PT film will be used to enhance the sensitivity of medical ultrasound images with cellular resolution. To achieve the necessary spatial resolution, the transducer must emit a high-frequency, broadband pulse. As the ultrasonic frequency increases, the attenuation of the diagnostic wave increases in human tissue and there is a need for more measurement sensitivity. The proposed investigation is particularly relevant to the development of low-cost imaging devices for ophthalmology, dermatology, and otolaryngology as well as for the intravascular assessment of coronary pathologies. For these applications, transducer sensitivity plays an important role in the differential diagnosis of disease.. Ultrasound is one of the most cost-effective imaging diagnostics, and its continued development in other medical disciplines satisfies an important social need.

该小型企业创新研究第一阶段项目旨在设计用于医用超声换能器的高应变压电材料。拟议的工作需要研究弛豫铁电 Pb(Yb0.5Nb0.5)O3-PbTiO3 (PYbN-PT)。 d31 和 d33 压电系数的大幅增加可以通过沿赝立方 001 方向生长菱形 PYbN-PT 晶体来实现。目标是获得 001 取向单晶的优点，但要通过溶胶-凝胶薄膜方法来实现。 我们在弛豫铁电体领域的初步研究表明，PYbN-PT 的应变明显高于高性能换能器的主要材料锆钛酸铅 (PZT)。此外，新薄膜还具有 PZT 的许多其他理想特性。在第一阶段，PYnB-PT 将被开发并完全表征用于医疗超声。为了用于医学超声目的，PYbN-PT 薄膜的厚度必须达到至少 3-4 微米。所提出的一期优化研究应该能够将超声系统的选择性提高一个数量级以上。该项目的商业应用是在医学超声成像领域。 PYbN-PT 胶片将用于增强具有细胞分辨率的医学超声图像的灵敏度。为了实现必要的空间分辨率，传感器必须发射高频、宽带脉冲。随着超声波频率的增加，诊断波在人体组织中的衰减增加，并且需要更高的测量灵敏度。拟议的研究与眼科、皮肤科和耳鼻喉科以及冠状动脉病理的血管内评估的低成本成像设备的开发特别相关。对于这些应用，换能器灵敏度在疾病的鉴别诊断中发挥着重要作用。超声是最具成本效益的影像诊断之一，其在其他医学学科的持续发展满足了重要的社会需求。