High-frequency piezoelectric micromechanical ultrasonic transducers (PMUTs) are employed in various applications including fingerprint recognition, non-destructive testing, and medical imaging. In this study, the challenges associated with using lead zirconate titanate piezoelectric ceramics (PZT) in non-invasive vascular imaging and limitations of 1-D PMUT arrays are addressed by designing and fabricating a 2D PMUT array based on ScAlN piezoelectric film. To optimize output performance and minimize gate lobe influence, a parallel-hexagon array is designed with a spacing of half a wavelength (300 μm) to enhance the filling factor, reduce impedance, and improve output current. A silicon-on-insulator (SOI) wafer is utilized as the substrate for the PMUT, facilitating the MEMS process flow and wafer fabrication. The morphology and structure size of the PMUT are characterized using scanning electron microscopy and focused ion beam cutting. The measured resonant frequency in water is 2.36 MHz, with a simulation-test discrepancy of 9.2% and satisfactory displacement sensitivity, suggesting its suitability for non-invasive vascular imaging applications