Ultrasound Physics Test 1 Practice

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How does frame rate relate to depth and number of scan lines per frame? If PRF = 15 kHz and 120 scan lines are used per frame, what is the frame rate?

15 frames per second.

125 frames per second.

Frame rate is set by how often pulses can be sent (the PRF) and how many scan lines must be drawn for one frame. Each frame uses one pulse per scan line, so the frame rate equals PRF divided by the number of lines per frame. With a PRF of 15 kHz (15,000 pulses per second) and 120 scan lines per frame, the frame rate is 15,000 / 120 = 125 frames per second. Depth affects this relationship because imaging deeper objects requires longer travel times, which can reduce the PRF and thus the maximum achievable frame rate, but in this scenario the PRF is fixed, yielding 125 frames per second.

150 frames per second.

12.5 frames per second.