1984•IEEE Transactions on Sonics and UltrasonicsRequires access
Elastic Constants Measurement with a Digital Acoustic Microscope
David A. Sinclair, Ronald W. Smith, Simon D. Bennett
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Abstract
Abstroct-A digitally controlled scanning acoustic microscope has been used for the characterization of human tissue. A theoretical treatment of the problem is presented, showing how simple measurements enable the calculation of the elastic constants of a specimen with fine spatial resolution. An error analysis is also presented. Details of the experimental equipment are given and preliminary results investigating diffuse tumors in human liver are presented. I. INTRODUCTION HE scanning acoustic microscope (SAM) [l], [2] is a powerful tool for nondestructively imaging the elastic T of an object, Its usefulness would be considerably enhanced if quantitative data on the mechanical properties of a sample could be extracted from the corresponding microscope image. This has been the aim of a number of workers [3] -[8] . In this paper we will show that, for specimens which may be modeled as a single lossless fluid layer, an exact relationship may be developed between the acoustic impedance and velocity of a specimen and its response in the SAM. This