Piezoelectric composite components by Morgan Technical Ceramics, Fairfield, NJ, are engineered to improve the acoustic performance of ultrasound transducers used in medical applications, including sensors for catheters, blood pressure, auditory sounds, vascular flow, and medical imaging.  The piezoelectric composite material consists of a ferroelectric ceramic in an electrically inactive polymer matrix formulated with high coupling values and high dielectric properties. Combining the piezoelectric ceramic with polymer filler means that the overall density of the material better matches the medium through which sound waves travel. This results in lower acoustic impedance, higher energy transfer through body tissue, and a lower reverberation level on the front face of the acoustic device. The piezoelectric composites are in 1-3 and 2-2 structures, in sizes up to 1.5-in. square and frequencies from 100 kHz to 12 MHz.