Abstract

A method of determining a property of a desired region in an object includes transmitting first and second energy beams from first and second sources into the object such that the beams intersect at the desired region to induce vibration of the desired region, transmitting energy from a third source into the desired region, receiving signals from the desired region due to the energy from the third source, and analyzing at least one of amplitude, phase and frequency of the vibration of the desired region indicated by the received signals to determine the property of the desired region.

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