The increasing interest in 3D ultrasound imaging is pushing the development of 2D probes with a challenging number (N) of active elements. The most popular approach in order to contain N is the sparse array technique. Here the design of the array layout requires complex optimization algorithms, which are typically constrained by a few steering conditions. Ungridded extensions of the sparse array technique offer improved performance by adding a further degree of freedom in the optimization process. In this paper, it is proposed to design the layout of large circular arrays with limited N according to Fermat’s spiral seeds with spatial density modulation. This deterministic, aperiodic and balanced positioning procedure aims at guaranteeing uniform performance over a wide range of steering angles. The capabilities of the method is demonstrated by simulation comparing the performance of spiral and dense arrays.

256-element density-tapered spiral matrices for ultrasound phased imaging / Alessandro Ramalli; Piero Tortoli. - ELETTRONICO. - (2014), pp. 2087-2090. (Intervento presentato al convegno 2014 IEEE International Ultrasonics Symposium tenutosi a Chicago nel September 2014) [10.1109/ULTSYM.2014.0520].

256-element density-tapered spiral matrices for ultrasound phased imaging

RAMALLI, ALESSANDRO;TORTOLI, PIERO
2014

Abstract

The increasing interest in 3D ultrasound imaging is pushing the development of 2D probes with a challenging number (N) of active elements. The most popular approach in order to contain N is the sparse array technique. Here the design of the array layout requires complex optimization algorithms, which are typically constrained by a few steering conditions. Ungridded extensions of the sparse array technique offer improved performance by adding a further degree of freedom in the optimization process. In this paper, it is proposed to design the layout of large circular arrays with limited N according to Fermat’s spiral seeds with spatial density modulation. This deterministic, aperiodic and balanced positioning procedure aims at guaranteeing uniform performance over a wide range of steering angles. The capabilities of the method is demonstrated by simulation comparing the performance of spiral and dense arrays.
2014
2014 IEEE International Ultrasonics Symposium Proceedings
2014 IEEE International Ultrasonics Symposium
Chicago
September 2014
Alessandro Ramalli; Piero Tortoli
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/914935
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