High-frequency (50–100MHz) medical ultrasound transducer arrays produced by micromachining bulk PZT materials

2008 ◽  
Author(s):  
C. G. Liu ◽  
D. W. Wu ◽  
Q. F. Zhou ◽  
F. T. Djuth ◽  
K. K. Shung
Keyword(s):  
High Frequency ◽  
Ultrasound Transducer ◽  
Medical Ultrasound ◽  
Transducer Arrays

Microfabrication of electrode patterns for high-frequency ultrasound transducer arrays

2012 ◽  
Vol 59 (8) ◽  
pp. 1820-1829 ◽  
Author(s):  
Anne Bernassau ◽  
Luis Garcia-Gancedo ◽  
David Hutson ◽  
Christine Demore ◽  
Jim McAneny ◽  
...  
Keyword(s):  
High Frequency ◽  
Ultrasound Transducer ◽  
High Frequency Ultrasound ◽  
Transducer Arrays ◽  
Frequency Ultrasound

scholarly journals Cold Sintering of PZT 2-2 Composites for High Frequency Ultrasound Transducer Arrays

Actuators ◽  
2021 ◽  
Vol 10 (9) ◽  
pp. 235
Author(s):  
Shruti Gupta ◽  
Dixiong Wang ◽  
Smitha Shetty ◽  
Amira Meddeb ◽  
Sinan Dursun ◽  
...  
Keyword(s):  
Lead Zirconate Titanate ◽  
High Frequency ◽  
Sacrificial Layer ◽  
Beam Steering ◽  
Liquid Phase Sintering ◽  
Ultrasound Transducer ◽  
High Frequency Ultrasound ◽  
Sintering Aid ◽  
Resonance Frequencies ◽  
Transducer Arrays

Medical ultrasound and other devices that require transducer arrays are difficult to manufacture, particularly for high frequency devices (>30 MHz). To enable focusing and beam steering, it is necessary to reduce the center-to-center element spacing to half of the acoustic wavelength. Conventional methodologies prevent co-sintering ceramic–polymer composites due to the low decomposition temperatures of the polymer. Moreover, for ultrasound transducer arrays exceeding 30 MHz, methods such as dice-and-fill cannot provide the dimensional tolerances required. Other techniques in which the ceramic is formed in the green state often fail to retain the required dimensions without distortion on firing the ceramic. This paper explores the use of the cold sintering process to produce dense lead zirconate titanate (PZT) ceramics for application in high frequency transducer arrays. PZT–polymer 2-2 composites were fabricated by cold sintering tape cast PZT with Pb nitrate as a sintering aid and ZnO as the sacrificial layer. PZT beams of 35 μm width with ~5.4 μm kerfs were produced by this technique. The ZnO sacrificial layer was also found to serve as a liquid phase sintering aid that led to grain growth in adjacent PZT. This composite produced resonance frequencies of >17 MHz.

scholarly journals PIV applied to Eckart streaming produced by a medical ultrasound transducer

Ultrasonics ◽  
2001 ◽  
Vol 39 (6) ◽  
pp. 461-464 ◽  
Author(s):  
J.A. Cosgrove ◽  
J.M. Buick ◽  
S.D. Pye ◽  
C.A. Greated
Keyword(s):  
Ultrasound Transducer ◽  
Medical Ultrasound
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