PMN-PT single crystal, high-frequency ultrasonic needle transducers for pulsed-wave Doppler application

IEEE Trans Ultrason Ferroelectr Freq Control. 2007 Mar;54(3):668-75. doi: 10.1109/tuffc.2007.290.


High-frequency needle ultrasound transducers with an aperture size of 0.4 mm were fabricated using lead magnesium niobate-lead titanate (PMN-33% PT) as the active piezoelectric material. The active element was bonded to a conductive silver particle matching layer and a conductive epoxy backing through direct contact curing. An outer matching layer of parylene was formed by vapor deposition. The active element was housed within a polyimide tube and a 20-gauge needle housing. The magnitude and phase of the electrical impedance of the transducer were 47 omega and -38 degrees, respectively. The measured center frequency and -6 dB fractional bandwidth of the PMN-PT needle transducer were 44 MHz and 45%, respectively. The two-way insertion loss was approximately 15 dB. In vivo high-frequency, pulsed-wave Doppler patterns of blood flow in the posterior portion and in vitro ultrasonic backscatter microscope (UBM) images of the rabbit eye were obtained with the 44-MHz needle transducer.

Publication types

  • Evaluation Study
  • Research Support, N.I.H., Extramural

MeSH terms

  • Equipment Design
  • Equipment Failure Analysis
  • Image Enhancement / instrumentation*
  • Image Enhancement / methods
  • Miniaturization
  • Needles*
  • Reproducibility of Results
  • Sensitivity and Specificity
  • Transducers*
  • Ultrasonography, Doppler, Pulsed / instrumentation*
  • Ultrasonography, Doppler, Pulsed / methods