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Schematic diagrams of the transducer arrays and the digital phantoms. (a) Ring transducer array. (b) 3D illustration of Phantom 1. (c) Central section of Phantom1. (d) 3D illustration of Phantom2. (e) 3D illustration of Phantom 3. (f) 3D schematic of the linear array (only shows the sensing elements) and Phantom 5. (g) 3D schematic diagram of the planar array and Phantom 6. The red stars in (c) represent the positions of the analysis in Section 3.1.4 (for details see text).
