Injury response processes treated with ultrasound are influenced by which factors?

Injury response processes treated with ultrasound are influenced by which factors?

• A. Mode and frequency
• B. Patient age
• C. Tissue color
• D. Treatment location

Answer: (A)

Ultrasound affects tissue primarily through how the energy is delivered and how deep it travels. The mode and frequency are the two main factors shaping the injury response. Continuous mode delivers energy steadily, producing thermal effects that raise tissue temperature and enhance blood flow, collagen extensibility, and metabolic activity. Pulsed mode delivers energy in bursts with off times, producing mainly non-thermal, mechanical effects (like microstreaming and cavitation) that can promote cell permeability and repair processes without substantial heating. The frequency determines how deep the waves reach and how quickly they are absorbed: 1 MHz penetrates deeper tissues, while 3 MHz is absorbed more superficially and heats more quickly. These settings directly influence the healing cascade, whereas factors like patient age, tissue color, or treatment location do not define the modality’s biological response in the same way.

Ultrasound affects tissue primarily through how the energy is delivered and how deep it travels. The mode and frequency are the two main factors shaping the injury response. Continuous mode delivers energy steadily, producing thermal effects that raise tissue temperature and enhance blood flow, collagen extensibility, and metabolic activity. Pulsed mode delivers energy in bursts with off times, producing mainly non-thermal, mechanical effects (like microstreaming and cavitation) that can promote cell permeability and repair processes without substantial heating. The frequency determines how deep the waves reach and how quickly they are absorbed: 1 MHz penetrates deeper tissues, while 3 MHz is absorbed more superficially and heats more quickly. These settings directly influence the healing cascade, whereas factors like patient age, tissue color, or treatment location do not define the modality’s biological response in the same way.