The term describing the energy delivered to tissue by ultrasound is?

• A. Acoustic exposure
• B. Acoustic impedance
• C. Acoustic velocity
• D. Acoustic scattering

Answer: (A)

The concept being tested is the idea of how much ultrasonic energy actually reaches and is deposited in tissue. The correct term is acoustic exposure. It directly describes the energy delivered to tissue by the ultrasound wave, which is important for understanding safety and potential bioeffects like heating or mechanical effects.

The other terms describe properties of the tissue or the wave’s interaction with it rather than the energy imparted to the tissue: acoustic impedance is how much resistance the tissue offers to the wave at interfaces; acoustic velocity is the speed of sound through the tissue; acoustic scattering refers to the redirection of energy by boundaries or inhomogeneities.