Title :
Porous piezoelectric ceramic transducer for medical ultrasonic applications
Author :
Matsunaka, T. ; Tabuchi, Y. ; Kasai, C. ; Tachikawa, K. ; Kyono, H. ; Ikeda, H.
Author_Institution :
Aloka Co. Ltd., Tokyo, Japan
Abstract :
Porous piezoelectric ceramic transducers appropriate for medical ultrasonic imaging have been developed. The 3-3 type piezoelectric ceramics were made by sintering a mixture of PZT (lead zinc titanate) and polymer powders at about 1300°C. Porous ceramics with a maximum pore size of 40 μm were obtained. The acoustic impedance is in the range of 10 to 18 Mrayl. The electromechanical coupling factor is 0.45-0.67, and the mechanical Q is 5-15. Using these elements, mechanical sector scanners were fabricated. They generated acoustic pulses with very short ringdown times, which resulted in improved axial spatial resolution
Keywords :
biomedical ultrasonics; piezoelectric transducers; ultrasonic transducers; 1300 degC; PZT; acoustic impedance; electromechanical coupling factor; mechanical Q; mechanical sector scanners; medical ultrasonic; piezoelectric ceramic transducer; polymer powders; Acoustic transducers; Bioceramics; Biomedical imaging; Biomedical transducers; Piezoelectric transducers; Polymers; Titanium compounds; Ultrasonic imaging; Ultrasonic transducers; Zinc;
Conference_Titel :
Ultrasonics Symposium, 1988. Proceedings., IEEE 1988
Conference_Location :
Chicago, IL
DOI :
10.1109/ULTSYM.1988.49464
