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Improved sigma-delta ultrasound beamformers with adaptive low-pass decimation filters

Altinok, Gunes and Al-Janabi, Mohammed and Kale, Izzet (2011) Improved sigma-delta ultrasound beamformers with adaptive low-pass decimation filters. In: Proceedings of the 2011 IEEE Instrumentation and Measurement Technology Conference (I2MTC), Hangzhou, China, 10-12 May 2011. IEEE, pp. 329-333. ISBN 9781424479351

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Official URL: http://dx.doi.org/10.1109/IMTC.2011.5944358

Abstract

Sigma-Delta (Σ-Δ) beamformers have been proposed to reduce hardware complexity of the phased array front-end circuitry in digital ultrasound imaging systems. However, the sample repetitions involved in dynamic focusing degrades the image quality due to the elevated noise level. Thus, conventional low-pass decimators are deemed to be insufficient to suppress the elevated in-band noise floor. This paper shows that, adaptive rank-order filters in combination with the low-pass decimators following the beam summation are adequate to suppress the in-band noise components. As a result, we propose a novel hardware efficient digital beamformer employing single-bit Σ-Δ modulators incorporated with adaptive reconstruction filters. Simulations using experimental phantom data sets have shown that the proposed structure ensures high quality B-scan images comparable to the ones obtained by multi-bit A/D beamformers by preserving the hardware simplicity of the conventional single-bit Σ-Δ beamformers.

Item Type:Book Section
Research Community:University of Westminster > Electronics and Computer Science, School of
ID Code:10282
Deposited On:02 Feb 2012 15:33
Last Modified:02 Feb 2012 15:33

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