As depth of view increases, PRF decreases.

As depth of view increases, PRF decreases.

• A. Decreases
• B. Increases
• C. Remains the same
• D. Fluctuates

Answer: (A)

Pulse Repetition Frequency is the number of ultrasound pulses emitted each second, and its value is tied to how long the system must wait for echoes from the deepest point to return. That waiting period is the pulse repetition period, which depends on the maximum depth being imaged. Since PRF = 1 / PRP, imaging deeper means a longer PRP and therefore a smaller PRF. So increasing depth lowers PRF. If depth is reduced, echoes return sooner and you can fire pulses more often, increasing PRF. The other options don’t fit because they don’t reflect this inverse relationship between depth and PRF.

Pulse Repetition Frequency is the number of ultrasound pulses emitted each second, and its value is tied to how long the system must wait for echoes from the deepest point to return. That waiting period is the pulse repetition period, which depends on the maximum depth being imaged. Since PRF = 1 / PRP, imaging deeper means a longer PRP and therefore a smaller PRF. So increasing depth lowers PRF. If depth is reduced, echoes return sooner and you can fire pulses more often, increasing PRF. The other options don’t fit because they don’t reflect this inverse relationship between depth and PRF.