Acoustical streaming describes

Acoustical streaming describes

• A. Free flowing cells or particles moving towards beam
• B. Vibration of molecules at the beam interface
• C. Heat transfer from tissue to transducer
• D. Wave reflection at tissue boundaries

Answer: (A)

Acoustical streaming is the steady flow of fluid generated when ultrasound energy is absorbed in tissue or fluid. This energy absorption sets up small, continuous currents in the medium, and suspended cells or particles are carried along with that flow. It’s a mechanical transport effect distinct from the rapid vibration of molecules at the beam interface, heat transfer to tissue, or wave reflections at boundaries. Because the fluid itself is moving due to the ultrasound, free-flowing cells or particles are carried toward the beam by this streaming, making that option the best description.

Acoustical streaming is the steady flow of fluid generated when ultrasound energy is absorbed in tissue or fluid. This energy absorption sets up small, continuous currents in the medium, and suspended cells or particles are carried along with that flow. It’s a mechanical transport effect distinct from the rapid vibration of molecules at the beam interface, heat transfer to tissue, or wave reflections at boundaries. Because the fluid itself is moving due to the ultrasound, free-flowing cells or particles are carried toward the beam by this streaming, making that option the best description.