Abstract
A highly efficient piezoelectric transducer suitable for medical applications is disclosed which exhibits a 40 db ring down time of less than 3 cycles, that is, of less than 0.7 microsecond at 4.2 MHz. The subject transducer comprises a single crystal lithium niobate active element which is supported on a formed backing material which is lapped to a surface flatness of better than 0.0002 inches (0.0015 cm). The subject transducer, which is designed to be driven at 4.2 MHz further comprises a first matching layer having an impedance of 6.8-7.4×10 6 kg/m 2 sec and a second matching layer having an impedance of between 1.8-2.4×10 6 kg/m 2 sec. An alternate embodiment dual-power transducer is also disclosed which is suitable for operating at different power levels to selectively image or produce lesions in selected body tissues.
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