Increasing protein content in tissue leads to what change in ultrasound energy interaction?

• A. False
• B. True
• C. Not enough information
• D. Only at high frequencies

Answer: (B)

Increasing protein content changes how ultrasound energy interacts with tissue because proteins alter the tissue’s density and acoustic impedance. More protein typically means more interfaces and a greater mismatch in impedance with surrounding tissue, which increases reflection, scattering, and attenuation of the sound waves. So, raising protein content does affect the energy interaction, and this effect is not limited to very high frequencies—though it becomes more pronounced as frequency increases. That’s why the statement is true: increasing protein content leads to a change in how ultrasound energy propagates and interacts with the tissue.