Which electrical treatment utilizes sound waves?

The correct choice, audio-sonic therapy, utilizes sound waves as its primary mechanism for treatment. This therapy involves the application of sound frequencies to the body, which can stimulate healing, improve circulation, and promote relaxation. The sound waves used in this therapy can penetrate tissues at various depths, affecting both superficial and deeper layers, thereby providing both physical and psychological benefits.

This modality harnesses the power of sound to interact with the body's cells and tissues, which is distinct from other electrical treatments listed in the options. For instance, galvanic current therapy employs direct current to facilitate product penetration and activate skin tissue but does not involve sound waves. Microcurrent therapy focuses on low-level electrical currents to mimic the body's own electrical signals and improve cellular function. High frequency therapy uses a high-frequency electrical current to produce thermal effects and generate ozone, which also does not engage sound waves.

Therefore, audio-sonic therapy stands out as the specific treatment that integrates sound waves for therapeutic purposes.