In ultrasound imaging, are lower frequencies generally used for deeper tissue scanning?

• A. Yes
• B. No
• C. Sometimes
• D. Only for contrast

Answer: (A)

Penetration versus resolution is the key idea. Lower frequencies travel through tissue with less attenuation, so they can reach deeper structures, which is why they’re generally used for deeper tissue scanning. This comes with a trade-off: the lower frequency produces poorer spatial resolution compared with higher frequencies, but depth is the priority for deep targets like liver or kidney. Higher frequencies provide crisper detail but don’t penetrate as far, so they’re chosen for superficial structures. The other options don’t fit because the statement isn’t false due to depth, “sometimes” would blur the general rule, and frequency isn’t about contrast agent use.