Acoustic Imaging by Wave Field Extrapolation Part II: Practical Aspects
In this paper the practical aspects of acoustic imaging will be envisaged, based on the theoretical considerations given in the foregoing paper (Part I).
Plane wave method;
Zero offset method;
Complete dataset method.
It will be shown that the complete dataset allows the most general imaging technique and therefore may be used in inhomogeneous media. Both the plane wave and the zero offset method can be derived from the complete dataset and may be considered as simplified versions. However, some restrictions have to be made. The plane wave method is computationally simpler but it assumes that a plane wave stays a plane wave during propagation. From a data acquisition point of view the zero offset method is least intricate, but due to motion artefacts serious problems may be encountered during imaging.
Signal to noise ratio
KeywordsPlane Wave Practical Aspect Lateral Resolution Complete Dataset Depth Level
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- Ridder, J., 1975, Development of a real-time dynamically focussed ultra-sonic system for two dimensional imaging (in Dutch): Delft, doctoral thesis.Google Scholar
- Kak, A.L., Fry, F.J., 1976, Acoustic impedance profiling: an anaZytical and physical model study; Proceedings of Ultrasonic Tissue Characterization Seminar, NBS Special Publication 453.Google Scholar
- Wells, P.N.T., 1977, Biomedical Ultrasonics; Academic Press.Google Scholar
- Berkhout, A.J., 1980, Seismic migration - imaging of acoustic energy by wave field extrapolation-: Amsterdam/New York, Elsevier North Holland Publ. Comp.Google Scholar