Lens system for acoustical imaging

Details Lens system for acoustical imaging Lens system for acoustical imaging

1977-11-18

1980-01-15

Gill, James J.

Measuring and testing

Vibration

By mechanical waves

73641, 73642, 128 205Z, G01N 2900

Patent

active

041832493

ABSTRACT:
An object surrounded by media of differing acoustical impedances (e.g., an anatomical organ surrounded by other kinds of tissue within the human body) is acoustically imaged by an array of ultrasonic transducers affixed to the outer surface of an ultrasonic lens. In a preferred embodiment, the lens is homocentric, with the common center of curvature of the inner and outer surfaces of the lens being located at a relatively small acoustic aperture in the body so that object points distributed over a relatively large solid angle from the aperture can be imaged with minimum lens aberations. Where the object to be imaged is a human heart, the acoustic aperture is most conveniently located at an intercostal space between adjacent ribs.

REFERENCES:
patent: 3013170 (1961-12-01), Sheldon
patent: 3325781 (1967-06-01), Harris
patent: 3402598 (1968-09-01), Colgate
patent: 3480002 (1969-11-01), Flaherty et al.
patent: 3552382 (1971-01-01), Mount
patent: 3687219 (1972-08-01), Langlois
patent: 3789833 (1974-02-01), Bom
patent: 3794866 (1974-02-01), McElroy
patent: 3802253 (1974-04-01), Lee
patent: 3895340 (1975-07-01), Gilmour
patent: 3936791 (1976-02-01), Kossoff
"Ultrasonic Two-Dimensional Visualization for Medical Diagnosis" by Kossoff et al. from vol. 34, No. 5, The Journal of the Acoustical Society of America.

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