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. 2020 Jul 6;148(1):44–50. doi: 10.1121/10.0001512

FIG. 1.

FIG. 1.

(Color online) To enlarge focus using IASA, the algorithm was given two inputs: source pressure amplitude distribution and desired pressure amplitude distribution in the focal plane, referred to as target image. (a) Source pressure profile with an 80-mm diameter for validation of simulation. (b) The BWL simulations had the same source but with a 40-mm diameter circular cutout at the center for imaging the transducer. (c) Target image with a 12-mm diameter circle. (d) Target image with four circles with center located at (±4 mm, ±4 mm) and a 6-mm diameter. The pressures are normalized with respect to surface pressure of the source.