Ultrasonotomography

Details Ultrasonotomography Ultrasonotomography

1992-05-28

1993-10-05

Kamm, William E.

Surgery

Truss

Pad

12866101, 12866109, 12866007, 73625, 73626, A61B 806

Patent

active

052495779

ABSTRACT:
In ultrasonotomography, ultrasonic transducers are divided in the scanning direction and in a direction (elevation direction) orthogonal to the scanning direction and by changing the aperture in the elevation direction through focus in elevation direction, a tomogram and a Doppler signal of a blood flow can be obtained and displayed two-dimensionally. Doppler data is obtained by effecting slight angle scan of the ultrasonic beam mechanically or electronically in the elevation direction. Data pieces for the same raster of a plurality of Doppler data pieces obtained through the slight angle scan in the elevation direction are added/averaged or added to improve the S/N ration. By effecting the slight angle scan of the ultrasonic beam in the elevation direction orthogonal to a tomogram plane, a vessel at a position deviant form the tomogram plane can be found. Also, by virtue of the variable aperture in elevation direction and the function of focus in elevation direction, the resolution of tomogram in the orthogonal direction can be improved to promote the intensity of signal. In addition, by adding/averaging or adding blood flow signals, the S/N ratio can be improved.

REFERENCES:
patent: 4628738 (1986-12-01), Burckhardt et al.
patent: 4873985 (1989-10-01), Nakajima
patent: 5014710 (1991-05-01), Maslak et al.
patent: 5060651 (1991-10-01), Kondo et al.
patent: 5148808 (1992-09-01), Satake
"Ultrasonic B-Scanner with multi-line array", by D. Hassler, D. Hanig and R. Schwarz, Medical Division Seimens, Ultrasonic Image 4, pp. 32-43, 1982.

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