Which BNR ratio is considered the best for ultrasound therapy?

The best BNR (Beam Non-Uniformity Ratio) for ultrasound therapy is typically regarded as 1:1. The BNR is a critical factor in therapeutic ultrasound, representing the uniformity of the ultrasound beam emitted from the transducer. A 1:1 ratio indicates that the intensity of the ultrasound beam is equal throughout the treatment area, leading to consistent therapeutic effects without the risk of overheating or causing discomfort to the patient.

In terms of clinical application, a low BNR is desirable because it minimizes the likelihood of hot spots that can occur with higher ratios. When the BNR is higher, such as in the ratios of 2:1 or more, there is a greater potential for uneven distribution of ultrasound energy, which can lead to unintended side effects and less effective treatment. Therefore, achieving a BNR as close to 1:1 as possible ensures a more effective and safer ultrasound therapy experience for patients.