What does BNR stand for in ultrasound?

What does BNR stand for in ultrasound?

• A. Baseline neural ratio
• B. Beam nonuniformity ratio
• C. Beam noise ratio
• D. BNR is unrelated to transducer

Answer: (B)

Beam Nonuniformity Ratio describes how uniform the emitted ultrasound beam is. It’s the ratio of the strongest beam intensity to the average intensity across the beam, so a lower value means a more even, consistent image brightness. A beam with low BNR produces clearer, more reliable images with fewer hot spots or dark patches, while a high BNR shows uneven illumination and potential artifacts. This property comes from the transducer’s design and construction, and modern probes aim for a low BNR (more uniform beam).

Beam Nonuniformity Ratio describes how uniform the emitted ultrasound beam is. It’s the ratio of the strongest beam intensity to the average intensity across the beam, so a lower value means a more even, consistent image brightness. A beam with low BNR produces clearer, more reliable images with fewer hot spots or dark patches, while a high BNR shows uneven illumination and potential artifacts. This property comes from the transducer’s design and construction, and modern probes aim for a low BNR (more uniform beam).