A comparison of CMUTs and piezoelectric transducer elements for 2D medical imaging based on conventional simulation models

This work compares CMUT and piezoelectric transducer technology for a typical 1D 7.5-MHz medical transducer array element. The comparison is based on the Redwood model of the piezoelectric transducer and a spring-mass-damper model for the CMUT. The simulated CMUT shows over twice the fractional bandwidth of the piezoelectric transducer but one-half the sensitivity and lower noise-equivalent-voltage. Experimental data from a CMUT array element generally confirms the CMUT simulations although shows lower source pressure and bandwidth.

[1]  Edmond Cretu,et al.  VHDL-AMS behavioural modelling of a CMUT element , 2009, 2009 IEEE Behavioral Modeling and Simulation Workshop.

[2]  B.T. Khuri-Yakub,et al.  Analytically calculating membrane displacement and the equivalent circuit model of a circular CMUT cell , 2008, 2008 IEEE Ultrasonics Symposium.

[3]  D. Mills,et al.  Real-time in-vivo imaging with capacitive micromachined ultrasound transducer (cMUT) linear arrays , 2003, IEEE Symposium on Ultrasonics, 2003.

[4]  Ronald E. McKeighen,et al.  Design guidelines for medical ultrasonic arrays , 1998, Medical Imaging.

[5]  A. Bozkurt,et al.  A lumped-circuit model for the radiation impedance of a circular piston in a rigid baffle , 2008, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[6]  H. Koymen,et al.  Nonlinear modeling of an immersed transmitting capacitive micromachined ultrasonic transducer for harmonic balance analysis , 2010, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[7]  B. Auld,et al.  Modeling 1-3 composite piezoelectrics: thickness-mode oscillations , 1991, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[8]  M. Redwood.  Transient Performance of a Piezoelectric Transducer , 1961 .