How deep does 3-MHz ultrasound typically heat tissue?

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Multiple Choice

How deep does 3-MHz ultrasound typically heat tissue?

Explanation:
The main idea is that frequency determines how deep ultrasound energy heats tissue. A higher frequency like 3 MHz is absorbed more quickly and over a shorter distance, so the heating stays in superficial tissues. For 3 MHz, the energy is typically deposited to about 2 to 3 cm beneath the skin. If you need deeper heating, you’d use a lower frequency such as 1 MHz, which can affect tissues down to roughly 4–5 cm, depending on intensity and tissue characteristics. So the best choice is 2 to 3 cm.

The main idea is that frequency determines how deep ultrasound energy heats tissue. A higher frequency like 3 MHz is absorbed more quickly and over a shorter distance, so the heating stays in superficial tissues. For 3 MHz, the energy is typically deposited to about 2 to 3 cm beneath the skin. If you need deeper heating, you’d use a lower frequency such as 1 MHz, which can affect tissues down to roughly 4–5 cm, depending on intensity and tissue characteristics. So the best choice is 2 to 3 cm.

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