How deep does 1-MHz ultrasound typically heat tissue?

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Prepare for the BOC Domain 4 Treatment and Rehab exam with multiple choice questions and detailed explanations. Sharpen your knowledge of therapeutic modalities effectively. Get exam-ready now!

Multiple Choice

How deep does 1-MHz ultrasound typically heat tissue?

Explanation:
Depth of heating in therapeutic ultrasound is governed by frequency: lower frequencies penetrate deeper, so 1 MHz energy deposits heat several centimeters beneath the skin. In practice, 1-MHz ultrasound typically heats tissue about 3 to 5 cm below the surface, making it suitable for deeper muscles. Higher frequencies, like 3 MHz, heat more superficially (around 1–2 cm), while depths beyond 5 cm are not typical for 1 MHz.

Depth of heating in therapeutic ultrasound is governed by frequency: lower frequencies penetrate deeper, so 1 MHz energy deposits heat several centimeters beneath the skin. In practice, 1-MHz ultrasound typically heats tissue about 3 to 5 cm below the surface, making it suitable for deeper muscles. Higher frequencies, like 3 MHz, heat more superficially (around 1–2 cm), while depths beyond 5 cm are not typical for 1 MHz.

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