For imaging a structure with higher attenuation, using a lower-frequency transducer results in which combination?

For imaging a structure with higher attenuation, using a lower-frequency transducer results in which combination?

• A. Increased penetration, decreased spatial resolution
• B. Decreased spatial resolution, increased penetration
• C. Decreased penetration, increased spatial resolution
• D. Decreased penetration, decreased spatial resolution

Answer: (A)

When you lower the transducer frequency, you get more penetration because longer wavelengths travel deeper and attenuate less over distance. But that same lower frequency sacrifices spatial resolution, since finer detail requires shorter wavelengths. In tissues with higher attenuation, you want the signal to reach deeper structures, so choosing a lower frequency increases penetration. The trade-off is that the image loses sharper detail. So the best combination is increased penetration with decreased spatial resolution.

When you lower the transducer frequency, you get more penetration because longer wavelengths travel deeper and attenuate less over distance. But that same lower frequency sacrifices spatial resolution, since finer detail requires shorter wavelengths. In tissues with higher attenuation, you want the signal to reach deeper structures, so choosing a lower frequency increases penetration. The trade-off is that the image loses sharper detail. So the best combination is increased penetration with decreased spatial resolution.