In this paper an improved particle swarm optimization algorithm (IPSO) for ultrasound applications is proposed. In order
to overcome the drawbacks of standard PSO, some improved mechanisms for velocity updating, the exceeding boundary
control, global best perturbation and the simplified quadratic interpolation (SQI) operator are adopted. To show the
effectiveness of the proposed algorithm, a selected set of numerical example, concerned with linear as well as planar
array, is presented. Simulation results show that the refined pinpointing search ability and the global search ability of the
proposed algorithm are significantly improved when compared to the particle swarm optimization (PSO) and Genetic
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