The amount of acoustic energy that the patient receives is called?

• A. Acoustic exposure
• B. Acoustic impedance
• C. Acoustic power
• D. Attenuation

Answer: (A)

The amount of acoustic energy that the patient receives is acoustic exposure. This term captures the total energy delivered to tissue during a scan, taking into account how long the beam is on, the beam’s area, and how tissue attenuates energy as it travels. It’s essentially the dose of ultrasound energy that actually reaches and interacts with the patient.

This differs from acoustic power, which is the rate at which energy leaves the transducer (energy per unit time) and from acoustic impedance, which is a property of tissue that affects how much energy is reflected at interfaces. Attenuation describes energy loss as the beam travels through tissue. So exposure reflects the cumulative energy delivered to the patient, not just the emission rate or the tissue’s inherent properties.