Journal
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
Volume 65, Issue 11, Pages 2113-2120Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TUFFC.2018.2868413
Keywords
High-frequency ultrasonic transducer; high-resolution imaging; (K0.44Na0.52Li0.04)(Nb0.86Ta0.1Sb0.04)O-3 (KNLNTS) ceramic; lead-free linear array
Categories
Funding
- China Postdoctoral Science Foundation [2017M622805]
- Shenzhen Foundation [JCYJ20170413164936017, JCYJ20170817171836611]
- Shenzhen Key Laboratory of Ultrasound Imaging and Therapy
- NSFC [81527901, 61571431, 11534013]
- National Basic Research Program of China [2015CB755500]
- CAS Research Projects [QYZDB-SSW-JSC018, YJKYYQ20170065, YZ201507]
- Natural Science Foundation of Guangdong Province [2015A030306018, 2014A030313686, 2014A030312006]
- Guangdong Innovative and Entrepreneurial Research Team Program [2013S046]
- Shenzhen Peacock Plan [20130409162728468]
- Shenzhen Double Chain [[2018] 256]
- U.S. National Institute of Health [1R01EY026091, P41-EB002182]
- NATIONAL EYE INSTITUTE [R01EY026091] Funding Source: NIH RePORTER
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High-frequency array transducers can provide higher imaging resolution than traditional transducers, thus resolving smaller features and producing finer images. Commercially available ultrasonic transducers are mostly made with lead-based piezoelectric materials, which are harmful to the environment and public health. This paper presents the development of the 64-elements high-frequency (18.3 MHz) lead-free linear array ultrasonic transducer based on (K0.44Na0.52Li0.04)(Nb0.86Ta0.1Sb0.04)O-3 (KNLNTS) piezo-ceramic. Array elements were spaced at a 75-mu m pitch, and interconnected via a custom flexible circuit. The two matching layers and a light backing material were used to improve the performance of the array. The developed KNLNTS ceramic-based lead-free linear array exhibited a center frequency of 18.3 MHz, an average -6-dB bandwidth of 42%, an average two-way insertion loss of 41.8 dB, and a crosstalk between the adjacent elements of less than -53 dB near the center frequency. An image of a tungsten wire phantom was acquired using a Verasonics Vantage research ultrasound system. Results from imaging tests demonstrated a good imaging capability with a spatial resolution of 105 mu m axially and 166 mu m laterally, indicating that the lead-free linear array ultrasonic transducer based on KNLNTS ceramics is a promising alternative to lead-based transducers for ultrasound medical imaging.
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