Signal-to-noise ratio and image resolution in an ultrasonic imaging system are compared for four kinds of excitation signals, namely, a single pulse, an unmodulated pseudo-random code, a modulated pseudorandom code and a deconvolved pseudo-random code, all for a given length and amplitude. It was predicted and found from measurements that the best S/N and resolution are obtainable with the deconvolved pseudorandom code.
DixonR. C., Spread Spectrum System, Chapt. 3 (John Wiley & Sons, New York, NY, 1976).
2.
NahamooD.KakA. C., Ultrasonic echo imaging with pseudorandom and pulse sources: a comparative study, Ultrasonic Imaging3, 1–36 (1981).
3.
MacWilliamsF. J.SloaneN. J. A., Pseudo-random sequences and arrays, Proc. IEEE64, 1715–1728 (1976).
4.
CooperG. R.McGillemC. D., Probabilistic Methods of Signal and System Analysis, Chapt. 5 (HRW, New York, NY, 1971).
5.
SchmolkeJ.HillerD.ErmertH.SchaeferJ. O.GsraebnerG., Generation of Optimal Input Signals for Ultrasound Pulse-Echo Systems in 1982 IEEE Ultrasonics Symposium Proceedings, pp. 929–934 (IEEE Cat. No. 82CH1823-4).
6.
LathiB. P., Random Signals and Communication Theory, Chapt. 4 (International Textbook Co., Scranton, Pennsylvania, 1968).
