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. Author manuscript; available in PMC: 2018 Dec 18.
Published in final edited form as: Phys Med Biol. 2018 Mar 7;63(5):055015. doi: 10.1088/1361-6560/aaaf01

Figure 2.

Figure 2

The fraction of total acoustic power (G curve as described in Equation 5) passing through a circle in the focal plane for a 5 cm radius spherical bowl transducer (solid line) and an annular transducer with 5 cm outer radius and 2 cm hole inner radius (dashed line) transducer are shown. The dashed vertical lines represent the respective 6 dB positions and corresponding G values at those positions for both transducers, demonstrating the lower fractional power that passes through the focal region for the annular transducer.