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The schematic of the experimental systems to evaluate the flat and lensed transducers. (a) Acoustic mapping system to measure the acoustic distributions of the flat and lensed transducers. (b) A typical circular-scanning-based PACT system. M: Motorized stage; PC: Personal computer; DAQ: Data acquisition card; AMP: Amplifier; UST: Ultrasound transducer; P/R: Pulser/Receiver; R: Rotator; RM: Reflection Mirror; CL: Concave lens; GG: Ground glass; S: Samples.
