Method and apparatus for signal dependent gain control

Details Method and apparatus for signal dependent gain control Method and apparatus for signal dependent gain control

1990-11-05

1991-11-12

Jaworski, Francis

Surgery

Truss

Pad

73900, 73631, A61B 800

Patent

active

050639315

ABSTRACT:
A method and apparatus are provided for gain control in a Doppler or other scan system which projects a plurality of scan lines at a given angle to determine velocity of movement of a predetermined medium at the angle. A training line is generated at the angle of the scan lines, the training line being utilized to determine portions of the scan line which are in a flow medium of interest, such as blood, and portions of the scan line which are in clutter. Information from the training line is then utilized to control the gain of the scan lines so that the gain is substantially maximized when scan lines are in the flow medium, while being reduced so as not to saturate the system in general, and A/D converters in particular, when in clutter. When an image line is utilized in the system, this line may also function as the training line.

REFERENCES:
patent: 4545251 (1985-10-01), Uchida et al.
patent: 4688428 (1987-08-01), Nicolas
patent: 4733668 (1988-03-01), Torrence
patent: 4852576 (1989-08-01), Inbar et al.
patent: 4930511 (1990-06-01), Rossman et al.

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