When treating a superficial injury with ultrasound, which frequency is the best parameter to select?

When treating a superficial injury with ultrasound, selecting a frequency of 3 MHz is ideal due to its effective penetration properties in soft tissues. This frequency is particularly beneficial for superficial structures because it has a higher absorption rate in tissue than lower frequencies. This increased absorption leads to a more focused therapeutic effect, promoting better healing through mechanisms such as increased blood flow, reduced inflammation, and enhanced tissue repair.

In contrast, frequencies lower than 3 MHz, such as 1 MHz or 2 MHz, are better suited for deeper tissues as they can penetrate further without being absorbed immediately. Therefore, while they can be beneficial for treating deeper injuries or conditions, they do not provide the same level of energy to superficial tissues, making them less appropriate for treating superficial injuries where rapid and localized treatment is required. Frequencies above 3 MHz, like 4 MHz, may also be too energetic, potentially leading to overheating and tissue damage if not applied carefully, further validating the selection of the 3 MHz frequency for superficial therapies.