The consolidation of many images into a single frame best describes which imaging concept?

• A. Dynamic range
• B. Fill-in interpolation
• C. Phase quadrature
• D. Persistence

Answer: (D)

Persistence is the process of combining information from multiple frames over time into one display. By averaging or blending successive frames, many images are effectively consolidated into a single frame, which reduces speckle noise and smooths the image. This temporal integration makes the image look steadier and more coherent, though it can blur fast-moving structures if used too aggressively. The other terms describe different ideas—dynamic range is about the span of gray levels, fill-in interpolation creates intermediate data to fill gaps, and phase quadrature relates to Doppler signal processing—so they don’t describe merging frames over time like persistence does.