In therapeutic ultrasound, what depth is typically targeted by a 1 MHz frequency?

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Multiple Choice

In therapeutic ultrasound, what depth is typically targeted by a 1 MHz frequency?

Explanation:
Frequency determines how deep ultrasound energy can reach: lower frequencies penetrate deeper, while higher frequencies deposit energy more superficially. A 1 MHz setting is chosen when the target tissues lie several centimeters beneath the surface, typically up to about 5 cm. This is why the best choice indicates a depth of up to 5 cm. If you were using a higher frequency like 3 MHz, the energy would largely affect tissues only about 1–2 cm deep, which is why that option isn’t appropriate for deeper targets. Remember, exact depth varies with tissue type and how well the transducer is coupled, but 1 MHz is classically associated with approximately 5 cm of depth.

Frequency determines how deep ultrasound energy can reach: lower frequencies penetrate deeper, while higher frequencies deposit energy more superficially. A 1 MHz setting is chosen when the target tissues lie several centimeters beneath the surface, typically up to about 5 cm. This is why the best choice indicates a depth of up to 5 cm. If you were using a higher frequency like 3 MHz, the energy would largely affect tissues only about 1–2 cm deep, which is why that option isn’t appropriate for deeper targets. Remember, exact depth varies with tissue type and how well the transducer is coupled, but 1 MHz is classically associated with approximately 5 cm of depth.

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