The effect of ultrasound waves on living organisms, including their composition, function, growth, origin, development, and distribution is called?

• A. Biological effect
• B. Biophysical effect
• C. Acoustic effect
• D. Therapeutic effect

Answer: (A)

Biological effects describe what ultrasound energy does to living tissue and organisms, including changes in structure, function, growth, development, and distribution. This term captures the actual living-tissue response to acoustic exposure. It contrasts with biophysical effects, which are the physical mechanisms by which ultrasound interacts with tissue (such as heating, cavitation, and radiation forces) that can lead to those biological responses. An acoustic effect isn’t the standard term for this concept, and a therapeutic effect refers to a beneficial clinical outcome rather than the general biological response to imaging exposure. So the best description for the effect on living organisms is biological effect.