Two-Dimensional Ultrasound Imaging Using Single Transducer Pixel Based on Spatial-Spectrum Correlation Method

Traditional ultrasound imaging relies on one-dimensional (1D) transducer arrays for two-dimensional (2D) image. While precise, this approach is limited by slow imaging speeds and the complexity of parallel circuitry needed to manage multiple channels. This paper introduces a near-field imaging technique using a single multi-frequency piezoelectric micromachined ultrasonic transducer (pMUT) with a spatially correlated spectral design. As a result, an ultrasound image of a 0.3mm diameter pencil lead was constructed using the single transducer. Furthermore, the great potential for fast imaging was demonstrated using a multi-frequency square wave signal. This technique establishes a foundation for three-dimensional fast ultrasound imaging with minimal 1D channels, offering significant advantages for applications like endoscopy.