Apparatus and method for beamforming in an ultrasonic transducer array
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United States of America Patent
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Sep 24, 1985
Grant Date -
N/A
app pub date -
Nov 21, 1983
filing date -
Nov 21, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Electronically changing the effective element spacing of an array of acoustic transducer elements between the transmit and receive modes of operation of an ultrasound apparatus results in reducing the deleterious effects of grating lobes present in the pattern of the array because of element spacings in excess of one half of a wavelength. A linear or quadratic time delay distribution, or both simultaneously, is applied to the array for scanning and/or focusing by setting individually the time delay of the energy associated with each element of the array during one mode of operation, e.g. transmit. The array is organized into groups of elements, e.g. pairs, and the time delay distribution is applied by setting the time delay of the energy associated with each group of the array during the remaining mode of operation, e.g. receive.
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