Design, analysis and evaluation of sigma-delta based beamformers for medical ultrasound imaging applications

Altinok, G. 2016. Design, analysis and evaluation of sigma-delta based beamformers for medical ultrasound imaging applications. PhD thesis University of Westminster Engineering

TitleDesign, analysis and evaluation of sigma-delta based beamformers for medical ultrasound imaging applications
TypePhD thesis
AuthorsAltinok, G.
Abstract

The inherent analogue nature of medical ultrasound signals in conjunction with the abundant merits provided by digital image acquisition, together with the increasing use of relatively simple front-end circuitries, have created considerable demand for single-bit  beamformers in digital ultrasound imaging systems. Furthermore, the increasing need to design lightweight ultrasound systems with low power consumption and low noise, provide ample justification for development and innovation in the use of single-bit  beamformers in ultrasound imaging systems. The overall aim of this research program is to investigate, establish, develop and confirm through a combination of theoretical analysis and detailed simulations, that utilize raw phantom data sets, suitable techniques for the design of simple-to-implement hardware efficient  digital ultrasound beamformers to address the requirements for 3D scanners with large channel counts, as well as portable and lightweight ultrasound scanners for point-of-care applications and intravascular imaging systems.

In addition, the stability boundaries of higher-order High-Pass (HP) and Band-Pass (BP) Σ−Δ modulators for single- and dual- sinusoidal inputs are determined using quasi-linear modeling together with the describing-function method, to more accurately model the  modulator quantizer. The theoretical results are shown to be in good agreement with the simulation results for a variety of input amplitudes, bandwidths, and modulator orders. The proposed mathematical models of the quantizer will immensely help speed up the design of higher order HP and BP Σ−Δ modulators to be applicable for digital ultrasound beamformers.

Finally, a user friendly design and performance evaluation tool for LP, BP and HP  modulators is developed. This toolbox, which uses various design methodologies and covers an assortment of  modulators topologies, is intended to accelerate the design process and evaluation of  modulators. This design tool is further developed to enable the design, analysis and evaluation of  beamformer structures including the noise analyses of the final B-scan images. Thus, this tool will allow researchers and practitioners to design and verify different reconstruction filters and analyze the results directly on the B-scan ultrasound images thereby saving considerable time and effort.

Year2016
FileEngindeniz_Gunes_thesis.pdf

Related outputs

Stability analysis of bandpass sigma–delta modulators for single and dual tone sinusoidal inputs
Altinok, G., Al-Janabi, M., Kale, I. and Altinok, G. 2011. Stability analysis of bandpass sigma–delta modulators for single and dual tone sinusoidal inputs. IEEE Transactions on Instrumentation and Measurement. 60 (5), pp. 1546 -1554. doi:10.1109/TIM.2010.2102395

Improved ultrasound digital beamforming using single-bit sigma-delta modulators with band-pass decimation filters
Altinok, G., Al-Janabi, M., Kale, I. and Altinok, G. 2011. Improved ultrasound digital beamforming using single-bit sigma-delta modulators with band-pass decimation filters. in: Proceedings of the 2011 IEEE International Symposium on Circuits and Systems (ISCAS), Rio de Janeiro, Brazil, 15-18 May 2011 IEEE . pp. 2091-2094

Improved sigma-delta ultrasound beamformers with adaptive low-pass decimation filters
Altinok, G., Al-Janabi, M., Kale, I. and Altinok, G. 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

A describing function based method for predicting the stability of higher-order high-pass sigma-delta modulators
Altinok, G., Al-Janabi, M., Kale, I. and Altinok, G. 2010. A describing function based method for predicting the stability of higher-order high-pass sigma-delta modulators. in: 2010 Conference on Research in Microelectronics and Electronics (PRIME), 18-21 July 2010 IEEE . pp. 1-4

Stability predictions for higher-order band-pass sigma-delta modulators for dual sinusoidal inputs
Altinok, G., Al-Janabi, M., Kale, I. and Altinok, G. 2010. Stability predictions for higher-order band-pass sigma-delta modulators for dual sinusoidal inputs. in: Proceedings of the IEEE Instrumentation and Measurement Technology Conference, Texas, USA, May 3-6 2010 (I3MTC 2010) IEEE . pp. 541-545

A GUI driven Σ-Δ modulator design, evaluation and measurement tool with a view to practical implementation
Altinok, G., Al-Janabi, M., Kale, I. and Altinok, G. 2009. A GUI driven Σ-Δ modulator design, evaluation and measurement tool with a view to practical implementation. in: IEEE Intrumentation and Measurement Technology Conference, Singapore, May 2009. I2MTC '09 IEEE . pp. 1022-1025

Permalink - https://westminsterresearch.westminster.ac.uk/item/9x243/design-analysis-and-evaluation-of-sigma-delta-based-beamformers-for-medical-ultrasound-imaging-applications


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