What is the desired BNR for effective ultrasound treatment?

The desired Beam Nonuniformity Ratio (BNR) for effective ultrasound treatment is a low ratio. A low BNR indicates more uniformity in the ultrasound beam output, meaning that there is a smaller difference between the highest and lowest intensity within the ultrasound field. This uniformity is crucial for treatment effectiveness because it reduces the risk of hot spots, which can lead to tissue damage or pain due to excessive energy concentration.

In ultrasound applications, a low BNR, ideally close to 1:1 (though this is rare), ensures that the energy delivered to the tissues is more consistent and controlled. This allows for safer treatments, as practitioners can apply ultrasound with more confidence that the energy is being distributed evenly across the treatment area. Thus, utilizing an ultrasound machine with a low BNR enhances therapeutic outcomes and patient safety.