Two-Dimensional Measurement of Ultrasound Beam Patterns as a Function of Frequency
In ultrasonic imaging and tissue characterization, it is desirable to know the the pressure field of transducers. For a simple disc radiator operating in a piston mode, the field for continuous wave excitation may be calculated using diffraction theory. However, in practice, the field may be affected by transducer parameters such as backing and front surface matching. These effects are dependent on fabrication technique and sometimes difficult to control. Therefore, in order to ascertain imaging resolution or scattering volume dimensions which are determined by the beam profile, it is desirable to measure the actual pressure distribution.
KeywordsBeam Profile Beam Pattern Acoustical Holography Fresnel Approximation Transducer Axis
Unable to display preview. Download preview PDF.
- (1).J. T. McElroy, “Identification and Measurement of Ultrasonic Search Unit Characteristics”, TR 66-5, Automation Industries Inc., Boulder, Colorado, 1966.Google Scholar
- (2).N. Bom, C. T. Lancee and G. van Zwieten, “Calibration of an Ultrasound Sensor”, Ultrasonics 71 Conference Papers, 73–75.Google Scholar
- (3).W. G. Neubauer, “Observation of Acoustic Radiation from Plane and Curved Surfaces,” in Physical Acoustics, Principles and Methods, Vol.X, W. P. Mason and R. N. Thurston, eds. Academic Press, New York, 1973.Google Scholar
- (4).R. S. Mezrich, K. F. Etzold, D. H. R. Vilkomerson, “System for Visualizaing and Measuring Ultrasonic Wavefronts,” Acoustical Holography, Vol. 6, N. Booth, ed., Plenum Press, New York, 1975.Google Scholar
- (5).R. C. Waag, P. P. K. Lee, R. M. Lerner, L. P. Hunter, R. Gramiak, and E. A. Schenk, “Angle Scan and Frequency-swept Ultrasonic Scattering Characterization of Tissue,” Ultrasonic Tissue Characterization II, M. Linzer, ed., National Bureau of Standards, Spec. Publ.525, 1979.Google Scholar
- (6).P. M. Morse and K. U. Ingard, Theoretical Acoustics. McGraw-Hill Company, New York, 1968.Google Scholar