How is ultrasound intensity measured?

Ultrasound intensity is measured using the unit W/cm², which refers to watts per square centimeter. This measurement is crucial in assessing the power output of an ultrasound device in relation to the area over which it is delivered. The intensity, defined as the amount of energy transmitted per unit area, provides critical information about the efficacy and safety of ultrasound treatment techniques.

Understanding the units of measurement is essential in biophysical agents, as it ensures proper dosage and application during therapeutic interventions. Intensity affects tissue heating and treatment outcomes, making it important for practitioners to use the correct units and understand their implications for clinical practice.

The other choices may contain similar elements, but they either do not conform to the standard unit used for this specific measurement or contain typographical errors that could lead to confusion in a clinical setting. Only W/cm² is the widely recognized and accepted way to express ultrasound intensity.