Title :
The design of protection circuitry for high-frequency ultrasound imaging systems
Author :
Lockwood, Geoff R. ; Hunt, John W. ; Foster, F. Stuart
Author_Institution :
Dept. of Med. Biophys., Toronto Univ., Ont., Canada
Abstract :
Transmission line lengths in the protection circuitry of a high-frequency (>20-MHz) ultrasound imaging system have an important effect on the frequency, amplitude, and bandwidth of the pulse-echo response of the system. A model that includes the transmission line lengths between the pulser, transducer, and receiver and the electromechanical properties of high-frequency transducers is used to illustrate the importance of correctly choosing these line lengths. An iterative optimization procedure for designing the protection circuitry for a broadband system is proposed. A theoretical and experimental analysis of the validity of this approach is reported for a 45-MHz PVDF transducer.<>
Keywords :
acoustic imaging; biomedical ultrasonics; polymers; protection; transmission line theory; transmission lines; ultrasonic transducers; 20 to 45 MHz; 45-MHz PVDF transducer; HF US imaging system; amplitude; bandwidth; broadband system; circuit design; experimental analysis; frequency; high-frequency ultrasound imaging systems; iterative optimization procedure; line length effects; protection circuitry; pulse-echo response; transducer electromechanical properties; transmission line lengths; Diodes; Frequency; Impedance; Protection; Pulse amplifiers; Pulse circuits; Switches; Transmission line theory; Ultrasonic imaging; Ultrasonic transducers;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
