What is the penetration depth of low frequency ultrasound at 1 MHz?

The penetration depth of low frequency ultrasound, particularly at a frequency of 1 MHz, typically ranges from 2.5 cm to 5 cm. This range is particularly relevant in therapeutic applications where deeper structures need to be targeted for treatment, such as in musculoskeletal injuries or conditions.

Ultrasound works by using high-frequency sound waves that create mechanical vibrations in the tissue. The lower the frequency, the deeper the penetration because lower frequency sound waves can travel through tissue with less attenuation. Thus, at 1 MHz, the sound waves are able to penetrate effectively, allowing for therapeutic benefits to reach deeper layers of tissue, such as muscles and tendons.

This understanding is critical for clinicians when selecting appropriate frequencies for ultrasound therapy based on the tissues involved and the desired treatment outcomes.