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. Author manuscript; available in PMC: 2013 Dec 1.
Published in final edited form as: BJU Int. 2012 Sep 3;110(11 0 0):E871–E877. doi: 10.1111/j.1464-410X.2012.11382.x

Figure 7.

Figure 7

Effect of defect location on acoustic field at the focal plane. A 3.0 cm Styrofoam disk was moved along the horizontal axis (x-axis, positive direction). With the defect on-axis (X=0 cm) P+ was slightly increased, and focal width was narrowed compared to unobstructed coupling. Moving the defect 1.0 cm laterally shifted P+ max ~1.0 mm laterally. Moving the defect to 2.0 cm off-axis eliminated the rise in P+ but the focal point remained skewed. When the defect was moved 3.0 cm laterally (not shown) trace was similar to unobstructed coupling, further suggesting that defects near the periphery of the coupling window have minimal effect on the acoustic field.