What is a typical frame rate for B-mode real-time imaging?

What is a typical frame rate for B-mode real-time imaging?

• A. 1-9 kHz
• B. 10-50 Hz
• C. 100-200 MHz
• D. 200-300 Hz

Answer: (B)

Frame rate is the number of images displayed each second in B-mode real-time imaging. Each frame requires emitting pulses, collecting echoes, and constructing a grayscale image, so the rate is tied to how quickly those steps can be completed rather than to the ultrasound frequency itself. In practice, to look truly real-time, machines operate at tens of frames per second. That places the typical B-mode real-time frame rate in the 10 to 50 Hz range. The other options describe frequencies outside the display rate: kilohertz would be far too high for frame rate, megahertz refer to the transducer’s acoustic frequency, and 200–300 Hz, while still real-time, is slower than what’s usually considered typical.

Frame rate is the number of images displayed each second in B-mode real-time imaging. Each frame requires emitting pulses, collecting echoes, and constructing a grayscale image, so the rate is tied to how quickly those steps can be completed rather than to the ultrasound frequency itself. In practice, to look truly real-time, machines operate at tens of frames per second. That places the typical B-mode real-time frame rate in the 10 to 50 Hz range. The other options describe frequencies outside the display rate: kilohertz would be far too high for frame rate, megahertz refer to the transducer’s acoustic frequency, and 200–300 Hz, while still real-time, is slower than what’s usually considered typical.