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. Author manuscript; available in PMC: 2019 Jul 25.
Published in final edited form as: Phys Med Biol. 2019 Jun 10;64(12):125001. doi: 10.1088/1361-6560/ab2318

Figure 4.

Figure 4.

a) Diagram of proof-of-concept experimental applicator assembly consisting of an 8-ring cylindrical phased transducer array centered in a 3D printed hollow and air-backed paraboloid or conical reflector fixture, submerged in degassed and deionized water for hydrophone measurements. b) Fabricated array and transducer housing centered in a printed reflector fixture. c) Prototype deployable assembly with custom designed paraboloid multi-compartment balloon, with air inflation and distension of the external silicone membrane (black arrowhead) shown in d) to form a reflective boundary along the transverse boundary of the internal water-filled high-pressure PET balloon.