Which frequency would probably result in the greatest ultrasonic attenuation losses?

Which frequency would probably result in the greatest ultrasonic attenuation losses?

• A. 1 MHz
• B. 2.25 MHz
• C. 10 MHz
• D. 25 MHz

Answer: (D)

Attenuation losses grow with frequency because higher‑frequency ultrasound interacts more with the material, converting more of the wave energy into heat and scattering per unit distance. That means the amplitude of the wave diminishes faster as it travels, reducing penetration depth. In practice, you trade off resolution and penetration: higher frequencies give sharper detail but don’t penetrate as far. Among the options, the highest frequency will experience the most attenuation, so it will have the greatest attenuation losses. The lower frequencies will penetrate farther with less loss, though with lower resolution.

Attenuation losses grow with frequency because higher‑frequency ultrasound interacts more with the material, converting more of the wave energy into heat and scattering per unit distance. That means the amplitude of the wave diminishes faster as it travels, reducing penetration depth. In practice, you trade off resolution and penetration: higher frequencies give sharper detail but don’t penetrate as far. Among the options, the highest frequency will experience the most attenuation, so it will have the greatest attenuation losses. The lower frequencies will penetrate farther with less loss, though with lower resolution.