Persistence is a technique used in ultrasound imaging that averages individual frames together to improve the overall image quality. This process helps to reduce noise and improve the signal-to-noise ratio, leading to clearer and more stable images. By averaging multiple frames, transient artifacts are minimized, and the continuity of structures is better visualized. Persistence is particularly useful in imaging static or slow-moving structures. Reference:
ARDMS Sonography Principles and Instrumentation guidelines
"Ultrasound Physics and Technology: How, Why and When" by M. Evans, C. Archer, and K. Weston