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Fig. 12 —Diagram depicts transition from one-dimensional (1D) to 3D data set. Note single scan line from single crystal 1D or A-mode scan transitioning to axial and lateral imaging with 2D phased-array scanning and to axial, lateral, and elevation scanning with 3D matrix scanning. See further discussion in Live 3D Imaging section. C scan is essentially an axial cut through 3D data set. (Illustration by Richard Gersony)