Which effect is described by micromassage in nonthermal ultrasound?

Which effect is described by micromassage in nonthermal ultrasound?

• A. Fluids and solids are moved
• B. Tissue melting
• C. Ionization occurs
• D. Vibration of bone

Answer: (A)

Nonthermal ultrasound relies on mechanical actions of the waves rather than heat. Micromassage specifically refers to tiny movements of the fluids around cells and the surrounding solid tissue induced by the oscillating sound waves. These movements—microstreaming and related shear forces—affect the extracellular environment and cell membranes, which can help with tissue healing and reduce pain without raising tissue temperature appreciably. That’s why the effect described is that fluids and solids are moved. The other possibilities would require heating (tissue melting), involve processes not produced by therapeutic ultrasound at typical intensities (ionization), or describe a different mechanical outcome (vibration of bone) that isn’t the characteristic micromassage effect of nonthermal ultrasound.

Nonthermal ultrasound relies on mechanical actions of the waves rather than heat. Micromassage specifically refers to tiny movements of the fluids around cells and the surrounding solid tissue induced by the oscillating sound waves. These movements—microstreaming and related shear forces—affect the extracellular environment and cell membranes, which can help with tissue healing and reduce pain without raising tissue temperature appreciably. That’s why the effect described is that fluids and solids are moved. The other possibilities would require heating (tissue melting), involve processes not produced by therapeutic ultrasound at typical intensities (ionization), or describe a different mechanical outcome (vibration of bone) that isn’t the characteristic micromassage effect of nonthermal ultrasound.