A lower beam nonuniformity ratio (BNR) indicates greater beam uniformity.

A lower beam nonuniformity ratio (BNR) indicates greater beam uniformity.

• A. True
• B. False
• C. Not necessarily
• D. A lower BNR indicates greater beam uniformity

Answer: (D)

BNR tells you how even the ultrasound beam is by comparing the highest intensity in the beam to the average intensity across the beam. A lower ratio means the peak is closer to the average, so there are fewer hotspots and the energy is spread more uniformly. That uniform distribution is why a lower BNR equates to greater beam uniformity. High BNR, conversely, indicates more pronounced hotspots and less uniformity. So the statement that a lower BNR indicates greater beam uniformity is correct.

BNR tells you how even the ultrasound beam is by comparing the highest intensity in the beam to the average intensity across the beam. A lower ratio means the peak is closer to the average, so there are fewer hotspots and the energy is spread more uniformly. That uniform distribution is why a lower BNR equates to greater beam uniformity. High BNR, conversely, indicates more pronounced hotspots and less uniformity. So the statement that a lower BNR indicates greater beam uniformity is correct.