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In this paper, we present the optimal use of coded signals in diverging wavetransmission for fast ultrasonic imaging. The performance of coded imaging withdiverging waves, quantified by SNR, CNR, speckle power and target signalstrength, is optimized in terms of code length, wave profile, aperture size andfield of view. We obtained one frame in 200 microseconds using coded divergingwave transmission, equivalent to very high 5000 frames/s rate, where theimaging depth is 7.5 cm. The performances of coded diverging wave transmissionand conventional single focused phased array imaging are compared on a singleframe basis. Complementary Golay sequences with code lengths ranging from 2 to10 bits are used to code the signal. The signal strength and SNR obtained usingsynthetic transmit aperture and conventional single focused phased arrayimaging techniques, respectively, are used as reference in the performanceanalysis. We present a method to determine the optimum diverging wave profileto maximize the SNR across the entire viewing sector, which matches thereceived signal strength distribution to that of synthetic transmit apertureimaging. Optimum diverging wave profiles are determined for different sectorangles and for different array apertures. For 90{\deg} sector, the SNR of 8-bitcoded signal with optimized diverging wave profile is higher than that ofconventional single focused phased array imaging at all depths and regionsexcept the focal region, where it is 2-8 dB lower.

Coded Divergent Waves for Fast Ultrasonic Imaging: Optimization and Comparative Performance Analysis