Method and apparatus for delaying ultrasound signals

Details Method and apparatus for delaying ultrasound signals Method and apparatus for delaying ultrasound signals

1997-12-31

1999-08-10

Lateef, Marvin M.

Surgery

Diagnostic testing

Detecting nuclear, electromagnetic, or ultrasonic radiation

600444, 600447, A61B 800

Patent

active

059350709

ABSTRACT:
An ultrasound beamformer that processes the signals of an array transducer includes a plurality of processing channels, one for each element of the active transducer array. Each channel includes a digitizing element for converting the received signal into digital samples and a delay element for delaying the digitized signal. The delays are chosen so that when the signals from the individual channels are combined, a beam forms in a particular direction. The invention implements sub-sampling period delays in the individual channels with low-complexity digital filters having superior delay characteristics with respect to frequency, but having undesirable attenuation characteristics with respect to frequency. The invention corrects for the undesirable attenuation characteristics via a single digital filter after the signals from the individual channels have been combined.

REFERENCES:
patent: 5217017 (1993-06-01), Matsushima
patent: 5345426 (1994-09-01), Lipschutz
patent: 5608690 (1997-03-01), Hossack et al.
patent: 5685308 (1997-11-01), Wright et al.
Dolazza, E., The Bell-Spine, a Digital Filtering/Interpolation Algorithm, Proceedings of SPIE-The International Society for Optical Engineering, vol. 1092, Jan. 31 Feb. 3, 1989, pp. 568-583.

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