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. Author manuscript; available in PMC: 2011 Apr 26.
Published in final edited form as: IEEE Trans Biomed Eng. 2009 Sep 18;57(1):134–144. doi: 10.1109/TBME.2009.2031816

Figure 2.

Figure 2

Concept of conventional steering, illustrated here for targets located in the focal plane of the array and reached using beam-steering from a set of pulse signals which optimally focus on the geometrical center of the array. The focusing of the reference a), and of two other sets b) and c) of signals conventionally steered are shown. The focusing degrades as the distance from the reference position increases since the aberrations encountered by the beams differ. c) also illustrates the concept of isoplanatic patch.