Beamformed ultrasonic imager with delta-sigma feedback control

Surgery – Diagnostic testing – Detecting nuclear – electromagnetic – or ultrasonic radiation

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341155, A61B 812

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active

059647086

ABSTRACT:
A method and apparatus are provided for reducing distortion in a dynamically delayed digital sample stream of an imaging system. The method includes the steps of delta-sigma modulating an input analog signal of the imaging system at a frequency above the Nyquist frequency of the input analog signal to generate a digital sample stream and changing a length of the sample stream to delay a portion of the sample stream while maintaining synchronism between a delta-sigma modulator and a demodulator of the system.

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Norman, O., A Band-Pass Delta-Sigma Modulator for Ultrasound Imaging at 160 MHZ Clock Rate, 31(12) IEEE Journal of Solid-State Circuits 2036-41 (Dec., 1996).
Baseri, R., et al., Testing Adaptive Jamming Cancellation Algorithms using a Digital Beamforming Array, Proceedings of the 1997 IEEE National Radar Conference (May 13-15, 1997).

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