Title :
An analytical prediction of the nonlinear diffractive fields of medical ultrasound tranducers
Author :
Kharin, Nikolay A. ; Lockwood, Geoffrey R.
Author_Institution :
Dept. of Biomed. Eng., Cleveland Clinic Found., OH, USA
fDate :
6/20/1905 12:00:00 AM
Abstract :
The nonlinear propagation of ultrasound in medical imaging has recently been exploited to improve image resolution and remove nearfield artifacts generated by overlying tissue structures. The images are formed using the second harmonic energy generated by nonlinear propagation. This propagation can be modeled using the KZK wave equation. The authors present an analytical solution to the KZK equation for a circular piston transducer. The solution is based on the method of slowly changing wave profile and is valid for moderate nonlinearity. The resulting analytical solution provides an easy way to estimate the generation of harmonics in the radiation pattern. Excellent agreement was found between the analytical predictions and experimental results
Keywords :
biomedical transducers; biomedical ultrasonics; image resolution; ultrasonic diffraction; ultrasonic propagation; ultrasonic transducers; KZK wave equation; analytical prediction; analytical predictions; circular piston transducer; experimental results; harmonics generation; image resolution improvement; medical ultrasound tranducers; moderate nonlinearity; nearfield artifacts removal; nonlinear diffractive fields; radiation pattern; Biomedical imaging; Diffraction; Harmonic analysis; Image resolution; Nonlinear equations; Partial differential equations; Pattern analysis; Pistons; Transducers; Ultrasonic imaging;
Conference_Titel :
Ultrasonics Symposium, 1998. Proceedings., 1998 IEEE
Print_ISBN :
0-7803-4095-7
DOI :
10.1109/ULTSYM.1998.765321
