Acoustic examination, material characterization and imaging of t

Details Acoustic examination, material characterization and imaging of t Acoustic examination, material characterization and imaging of t

1976-02-02

1978-08-08

Kamm, William E.

Surgery

Truss

Perineal

73597, 73602, 128 205Z, A61B 1000

Patent

active

041050185

ABSTRACT:
Pulses of acoustic energy are transmitted from a plurality of different directions through a plane of interest, or a number of adjacent planes of interest, of a body to be examined. The body may be biological or non-biological. Time-of-flight of the pulses is measured for individual paths through the body, and from the data thus obtained the spatial distribution of the acoustic velocity through the plane or planes within the body is reconstructed using a mathematical reconstruction technique. The velocity values thus obtained, which are uniquely determinative of the acoustic index of refraction at each point, have diagnostic value, and they can further be displayed by means of a cathode ray tube or other imaging device to provide an image of the internal structure along each plane. The disclosed technique has the advantage of being highly independent of acoustic attenuation and reflections occurring along the paths.

REFERENCES:
patent: 3023611 (1962-03-01), Howry
patent: 3156110 (1964-11-01), Clyngs
patent: 3177382 (1965-04-01), Green
patent: 3606879 (1971-09-01), Estes
patent: 3778756 (1973-12-01), Houston et al.
patent: 3830223 (1974-08-01), Beretsky
patent: 3878373 (1975-04-01), Blum
patent: 3909771 (1975-09-01), Pickering et al.
patent: 3918024 (1975-11-01), Macovski
Greenleaf et al, "Acoustical Holography", vol. 6, Plenum Press, New York/London, Feb. 1975 pp. 71-79.
Greenleaf et al, "Acoustical Holography", vol. 5, Plenum Press, New York/London, 1974, pp. 591-603.

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