Communications – electrical: acoustic wave systems and devices – Acoustic image conversion
Patent
1990-10-05
1992-06-09
Pihulic, Daniel T.
Communications, electrical: acoustic wave systems and devices
Acoustic image conversion
367135, G03B 4206
Patent
active
051213613
ABSTRACT:
The train of echoes received in an ultrasound imaging system having an array of ultrasound transducers is shaped and/or focused by first and second programmable beam focusing modules in a dynamic receive focus mode. The elemental ultrasound echo signals from a plurality of channels connected to the elements of the transducer array are selectively attenuated and/or phased shifted according to the programs prescribed for the focus zones and combined by each module. The combined echo signals are further processed in conventional fashion. The modules operates alternately. One module is being programmed, while the other module is combining the elemental echo signals for processing. Each beam focusing module comprises a delay line having a plurality of input taps and a cross point switch selectively connecting the channels to the input taps. The module is programmed by selectively closing the individual cross points of the cross point switch. Beam shaping i.e. apodizing, is accomplished by selectively attenuating the echoes prior to application to the input taps of the delay line in each module. The modules can be reconfigured to connect the modules in series in a composite focus mode.
REFERENCES:
patent: 4305296 (1981-12-01), Green et al.
patent: 4392379 (1983-07-01), Yamaguchi
patent: 4528854 (1985-07-01), Shimazaki
patent: 4638467 (1987-01-01), Takeuchi
patent: 4811740 (1989-03-01), Ikeda et al.
Harrison, Jr. William V.
Vogt David E.
Acoustic Imaging Technologies Corporation
Pihulic Daniel T.
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