Foster F S, Harasiewicz K A, Sherar M D
Dept. of Med. Biophys., Toronto Univ., Ont., Canada.
IEEE Trans Ultrason Ferroelectr Freq Control. 2000;47(6):1363-71. doi: 10.1109/58.883525.
Polyvinylidene fluoride (PVDF) is a ferroelectric polymer with unique properties suitable for use in a wide range of medical and biological imaging applications. Most notable among these is its low acoustic impedance, which matches that of the body reasonably well, and its flexible mechanical properties. This paper traces the exploitation of PVDF as a transducer material from its early beginnings for thyroid and breast imaging to its current well-established applications in ultrasound biomicroscopy. Although PVDF's electromechanical properties fall short of composite ceramic materials in the traditional diagnostic frequency range, it has significant advantages in the 25-to 100-MHz range. Design criteria for high frequency transducers are reviewed, and examples of relevant medical and biological images are used to illustrate the excellent image quality obtained with this remarkable material.
聚偏二氟乙烯（PVDF）是一种铁电聚合物，具有独特的性能，适用于广泛的医学和生物成像应用。其中最显著的是其低声阻抗，与人体的声阻抗相当匹配，以及其灵活的机械性能。本文追溯了PVDF作为换能器材料从早期用于甲状腺和乳腺成像到目前在超声生物显微镜中成熟应用的发展历程。尽管PVDF的机电性能在传统诊断频率范围内不如复合陶瓷材料，但它在25至100兆赫兹范围内具有显著优势。本文回顾了高频换能器的设计标准，并通过相关医学和生物图像的实例来说明使用这种卓越材料所获得的出色图像质量。
