Which term refers to the rate at which frames are displayed, affecting perceived motion?

• A. Frame Rate
• B. Dynamic Range
• C. Frame
• D. Enhancement

Answer: (A)

Frame rate is the rate at which frames are displayed per second, and it directly shapes how motion appears on the screen. A higher frame rate makes movement look smoother and more continuous, which is crucial for real-time ultrasound when you’re tracking moving structures or evaluating Doppler flow. If frame rate is too low, motion can look choppy, and rapid events may be missed or misinterpreted. In practice, frame rate is influenced by imaging settings such as depth, sector width, and line density; increasing depth or widening the sector, or using more lines per frame, tends to lower the frame rate, while reducing these factors boosts temporal resolution. The other terms don’t describe how quickly frames are shown: dynamic range is about the span of gray shades, a frame is a single captured image, and enhancement refers to processing to improve image appearance.