Which statement accurately describes frequency usage for tissue depth in ultrasound?

Which statement accurately describes frequency usage for tissue depth in ultrasound?

• A. Higher frequencies are used for superficial scanning
• B. Lower frequencies are used for superficial scanning
• C. Frequency does not affect depth
• D. High frequency used for deep scanning

Answer: (B)

In ultrasound, frequency sets how detailed the image is and how far the sound can travel. Higher frequencies give sharper, more precise images but get attenuated quickly by tissue, so they don’t reach deep structures. Lower frequencies travel farther with less attenuation, but the image resolution is poorer. So for superficial structures you want a higher frequency to maximize detail, while for deep structures you use a lower frequency to ensure enough penetration, even though the image won’t be as crisp. The statement that matches this is that higher frequencies are used for superficial scanning. The other options don’t fit because they imply either using lower frequencies for superficial imaging, claim depth isn’t affected by frequency, or suggest high frequency for deep scanning.

In ultrasound, frequency sets how detailed the image is and how far the sound can travel. Higher frequencies give sharper, more precise images but get attenuated quickly by tissue, so they don’t reach deep structures. Lower frequencies travel farther with less attenuation, but the image resolution is poorer.

So for superficial structures you want a higher frequency to maximize detail, while for deep structures you use a lower frequency to ensure enough penetration, even though the image won’t be as crisp. The statement that matches this is that higher frequencies are used for superficial scanning. The other options don’t fit because they imply either using lower frequencies for superficial imaging, claim depth isn’t affected by frequency, or suggest high frequency for deep scanning.