What process describes the conversion of sound energy into heat in tissue?

What process describes the conversion of sound energy into heat in tissue?

• A. Reflection
• B. Diffraction
• C. Absorption
• D. Scattering

Answer: (C)

Sound-energy-to-heat conversion in tissue happens through absorption. As the ultrasound wave travels, part of its energy is taken up by the tissue and dissipated as heat due to molecular friction and viscous losses. This absorption is the main way energy is converted to heat, and it increases with frequency—the higher the frequency, the more energy is absorbed and potential heating. This differs from reflection, which sends energy back at interfaces; diffraction, which describes bending around obstacles; and scattering, which redirects energy in multiple directions. Those processes involve changing the direction or spread of the wave rather than turning its energy into heat.

Sound-energy-to-heat conversion in tissue happens through absorption. As the ultrasound wave travels, part of its energy is taken up by the tissue and dissipated as heat due to molecular friction and viscous losses. This absorption is the main way energy is converted to heat, and it increases with frequency—the higher the frequency, the more energy is absorbed and potential heating.

This differs from reflection, which sends energy back at interfaces; diffraction, which describes bending around obstacles; and scattering, which redirects energy in multiple directions. Those processes involve changing the direction or spread of the wave rather than turning its energy into heat.