Please use this identifier to cite or link to this item: http://hdl.handle.net/10525/810

 Title: Analysis and Optimization of Synthetic Aperture Ultrasound Imaging Using the Effective Aperture Approach Authors: Nikolov, MilenBehar, Vera Keywords: Ultrasound ImagingSynthetic ApertureStochastic Optimization Issue Date: 2005 Publisher: Institute of Information Theories and Applications FOI ITHEA Abstract: An effective aperture approach is used as a tool for analysis and parameter optimization of mostly known ultrasound imaging systems - phased array systems, compounding systems and synthetic aperture imaging systems. Both characteristics of an imaging system, the effective aperture function and the corresponding two-way radiation pattern, provide information about two of the most important parameters of images produced by an ultrasound system - lateral resolution and contrast. Therefore, in the design, optimization of the effective aperture function leads to optimal choice of such parameters of an imaging systems that influence on lateral resolution and contrast of images produced by this imaging system. It is shown that the effective aperture approach can be used for optimization of a sparse synthetic transmit aperture (STA) imaging system. A new two-stage algorithm is proposed for optimization of both the positions of the transmitted elements and the weights of the receive elements. The proposed system employs a 64-element array with only four active elements used during transmit. The numerical results show that Hamming apodization gives the best compromise between the contrast of images and the lateral resolution. URI: http://hdl.handle.net/10525/810 ISSN: 1313-0463 Appears in Collections: Volume 12 Number 3

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