What does intensity describe in ultrasound therapy?

What does intensity describe in ultrasound therapy?

• A. Power of the ultrasound unit
• B. Wavelength
• C. Frequency
• D. Duty cycle

Answer: (A)

Intensity describes the rate at which energy is delivered to tissue per unit area by the ultrasound beam. It is the power spread over the beam’s cross-sectional area (commonly expressed as watts per square centimeter), and it directly reflects how strong the beam’s effect is—more energy per area means more heating and stronger mechanical interactions. This differs from frequency, which tells you how often the wave cycles per second, and from wavelength, which is the distance between successive peaks; neither of these describes how much energy is being delivered. Duty cycle indicates the fraction of time the beam is on during pulsing, not the total energy delivered per area when it is on. So intensity best captures the therapeutic strength of the ultrasound by quantifying the energy delivery rate per area.

Intensity describes the rate at which energy is delivered to tissue per unit area by the ultrasound beam. It is the power spread over the beam’s cross-sectional area (commonly expressed as watts per square centimeter), and it directly reflects how strong the beam’s effect is—more energy per area means more heating and stronger mechanical interactions. This differs from frequency, which tells you how often the wave cycles per second, and from wavelength, which is the distance between successive peaks; neither of these describes how much energy is being delivered. Duty cycle indicates the fraction of time the beam is on during pulsing, not the total energy delivered per area when it is on. So intensity best captures the therapeutic strength of the ultrasound by quantifying the energy delivery rate per area.