A simple scheme for self-focusing of an array

O. T. von Ramm and S. W. Smith, Beam steering with linear arrays,IEEE Trans. Biomed. Eng. 30:438?452 (1983).

D. H. Turnbull and F. S. Foster, Beam steering with pulsed two-dimensional transducer arrays,IEEE Trans. Ultrason. Ferroelec. Freq. Contr. 38:320?333 (1991).

D. H. Turnbull and F. S. Foster, Fabrication and characterization of transducer elements in two-dimensional arrays for medical ultrasound imaging,IEEE Trans. Ultrason. Ferroelec. Freq. Contr. 39:464?474 (1992).

S. W. Smith, H. G. Pavy, and O. T. von Ramm, High-speed ultra-sound volumetric imaging system?Part 1: Transducer design and beam steering,IEEE Trans. Ultrason. Ferroelec. Freq. Contr. 38:100?108 (1991).

M. Fink, Time reversal of ultrasonic fields?Part I: Basic principles,IEEE Trans. Ultrason. Ferroelec. Freq. Contr. 39:555?566 (1992).

F. Wu, J.-L. Thomas, and M. Fink, ?Time reversal of ultrasonic fields?Part II: Experimental results,IEEE Trans. Ultrason. Ferroelec. Freq. Contr. 39:567?578 (1992).

S. W. Flax and M. O'Donnell, Phase-aberration correction using signals from point reflectors and diffuse scatterers: Basic principles,IEEE Trans. Ultrason. Ferroelec. Freq. Contr. 35:758?767 (1988).