Question

What Beam Nonuniformity Ratio (BNR) is considered safe?

A) 1:1

B) 2:1

C) 5:1

D) 10:1

Answer 1

The safe BNR value is 1:1.

Step-by-step explanation:

The Beam Nonuniformity Ratio (BNR) represents the ratio of the maximum intensity to the average intensity of a beam of ultrasound or electromagnetic radiation. A safe BNR value is typically considered to be 1:1, where the maximum intensity does not exceed the average intensity. This ensures that the beam is relatively uniform and avoids the concentration of energy that could potentially harm tissues.

Therefore, the correct answer is option A) 1:1.