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Schematic of the 2D reconstruction, 3D direct reconstruction, and 3D focal-line reconstruction concepts. A: point of reconstruction. A′: point A projected in 2D reconstruction. A′C: 2D reconstruction delay. AC: 3D direct reconstruction delay. AE: 3D focal-line reconstruction delay. x-y: 2D reconstruction plane. The focal line is perpendicular to the transducer plane (x-z). (Video 1, QuickTime, 1.7 MB).
