Communications – electrical: acoustic wave systems and devices – Acoustic image conversion – With memory means
Patent
1991-10-31
1993-03-23
Pihulic, Daniel T.
Communications, electrical: acoustic wave systems and devices
Acoustic image conversion
With memory means
73625, 12866101, G01N 2904, G03B 4206
Patent
active
051970376
ABSTRACT:
A method and apparatus are provided for utilizing a digital front end in a phased array system such as an ultrasonic scanning system to simultaneously perform both digital beam formation and scan conversion. Echo signals from each of the N channels of the array aperture are sampled at selected points along returning echo signals. The samples are preferably used to determine a value for each channel for each pixel utilized in the display by, for example, determining a transmit time for such point. The values for each pixel for the N channels are then summed to obtain the value for the pixel. Alternatively, the samples may be taken at uniform intervals along each channel line and the sample values interpolated to obtain values at Y-boundary crossings or sampling may be taken at times determined so that each sample is at a Y-boundary crossing. The Y-boundary crossing sample values are stored and are then summed to obtain coherently enhanced sample values at the crossings. The sample values at the Y-boundary crossings may then be interpolated or otherwise utilized to obtain sample values for display pixels.
REFERENCES:
patent: 4468747 (1984-08-01), Leavitt et al.
patent: 4471449 (1984-09-01), Leavitt et al.
patent: 4817434 (1989-04-01), Anderson
Hewlett--Packard Company
Pihulic Daniel T.
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