Clean scientific schematic of an RCA ultrasonic array transmitting and receiving orthogonal plane waves into a solid block.

Scientific schematic illustration of an RCA (Row-Column Addressed) ultrasonic array for orthogonal plane wave imaging. The RCA probe consists of two orthogonal sets of elongated rectangular elements: column elements in red color and row elements in blue color, arranged in a cross-grid structure. On the left side, the column elements transmit tilted plane waves, forming a clearly visible oblique planar wavefront propagating into the medium, while the row elements receive the backscattered ultrasonic waves. The acoustic wave propagation should be illustrated with semi-transparent wavefronts and directional arrows, emphasizing beam steering and energy propagation. On the right side, a symmetric acquisition process is shown: row elements transmit tilted plane waves and column elements receive echoes, with the wavefront orientation orthogonal to the left case. The two acquisition modes are displayed side-by-side to highlight orthogonal plane wave transmission and reception (OPW). The imaging medium is a semi-transparent solid block, with subtle internal scatterers indicated by small dots. The overall style is clean, minimal, and professional, suitable for SCI/IEEE journal figures, with vector-style graphics, soft gradients, no artistic exaggeration, and a neutral background. No text labels, no decorative elements, no cartoon style. The received echoes should be illustrated as reflected wavefronts converging toward the receiving aperture, indicating coherent reception. The See more