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1. A method of imaging an object within a first material within a patient's body, the first material having a different density to the object, the method comprising: emitting no more than a single acoustic coherent beam; focusing the acoustic coherent beam to a virtual acoustic source in a fluid or an amorphous second material outside of the first material; moving the virtual acoustic source in the fluid or amorphous material such that at least a plurality of scattered beams from the virtual acoustic source scan the first material and at least one scattered beam is reflected from the object to form a reflected beam and at least one scattered beam bypasses the object to form a bypass beam, and wherein the reflected beam and the bypass beam intercept one another to form a coherent interference zone; moving an acoustic detector towards and away from the object using a detector actuator to defocus the coherent interference zone to provide a Fresnel fringe; and a processor forming the image of the object from the Fresnel fringe.
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