Ultrasonic imaging apparatus

Details Ultrasonic imaging apparatus Ultrasonic imaging apparatus

1978-07-18

1980-11-04

Michell, Robert W.

Surgery

Truss

Pad

73621, A61B 1000

Patent

active

042313732

ABSTRACT:
A data acquisition head for an ultrasonic imaging system which employs a plurality of transducers is disclosed. The transducers are rotated in a liquid filled chamber at a constant rate, each about an axis perpendicular to its transmission axis. The transducers are sequentially activated as their transmission axes cross a semi-rigid membrane which is in contact with the body. The acoustic impedance of the liquid and membrane, and the thickness of the membrane, are matched to enhance transmission. In one embodiment, the membrane is one-half or a full wavelength thick and comprises a low density polyethylene and the liquid has an acoustic impedance approximately equal to that of the polyethylene.

REFERENCES:
patent: 4047520 (1977-09-01), Soldner et al.
patent: 4094306 (1978-06-01), Kossoff
patent: 4103677 (1978-08-01), Lansiart et al.
patent: 4137777 (1979-02-01), Haverl et al.
patent: 4143554 (1979-03-01), Nagy et al.
patent: 4149419 (1979-04-01), Connell, Jr. et al.
Dick, D. E. et al., "High Resolution Rotating Head UTS Scanner" PCT/US79/00487 Int. Pub. 2/7/80, Int. Pri. 7/5/79 Priority 7/5/78.
Krautknawer, Ultrasonic Testing of Materials, 2nd Edition, Springer Publ. Co. 1977, pp. 23-27, 222-223, 232, 233-235.
Holm, H. H. et al., "A New Mechanical Real-Time UTS Contact Scanner", Ultrasound in Med. & Biol., Oct. 1975, vol. 2, No. 1 pp. 19-23.
Kossoff, G. et al., "Octoson: A New Rapid Multi-Transducer General Purpose Water-Coupling Echoscope", Proc. of the 2nd Europ. Cong. on UTS in Medicine, Munich, Germany, May 12-16, 1975, p. 90-95.

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