Title :
Finite element comparison of single crystal vs. multi-layer composite arrays for medical ultrasound
Author :
Mills, David M. ; Smith, Stephen W.
Author_Institution :
GE Global Res. Center, Niskayuna, NY, USA
fDate :
7/1/2002 12:00:00 AM
Abstract :
Finite element (PZFlex; Weidlinger Assoc., New York, NY and Los Altos, CA) simulations predict that for a 2-MHz phased array element with a single matching layer, the three-layer hybrid structure increases the pulse echo signal-to-noise ratio (SNR) by 16 dB over that from a single layer PZT element and -6 dB pulse echo fractional bandwidth from 58% for the PZT element to 75% for the hybrid element. Analogous finite element method (FEM) simulations of single crystal material [lead zinc niobate (PZN)-8% lead titanate (PT)] showed increased SNR by only 3.1 dB, but a -6 dB bandwidth of 108%.
Keywords :
acoustic impedance; biomedical transducers; biomedical ultrasonics; finite element analysis; medical signal processing; piezoelectric transducers; ultrasonic transducer arrays; 2 MHz; PZFlex simulations; PZT; PZT element; Pb(Zn/sub 1/3/Nb/sub 2/3/)O/sub 3/-PbTiO/sub 3/; PbZnO/sub 3/NbO/sub 3/-PbTiO/sub 3/; PbZrO3TiO3; SNR; finite element comparison; medical ultrasound; multi-layer composite arrays; phased array element; pulse echo fractional bandwidth; pulse echo signal-to-noise ratio; single crystal arrays; single matching layer; three-layer hybrid structure; transducer arrays; Bandwidth; Crystalline materials; Finite element methods; Lead; Medical simulation; Phased arrays; Predictive models; Signal to noise ratio; Ultrasonic imaging; Zinc; Ceramics; Finite Element Analysis; Transducers; Ultrasonography;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
DOI :
10.1109/TUFFC.2002.1020172
