What is a primary drawback of using higher frequencies in ultrasound?

• A. Increased sound penetration
• B. Decreased resolution
• C. Reduced tissue penetration
• D. Higher patient discomfort

Answer: (C)

Using higher frequencies in ultrasound is associated with reduced tissue penetration, which is a significant drawback. Higher frequency sound waves provide better resolution and detail in imaging, making them ideal for visualizing superficial structures. However, as frequency increases, the ability of the ultrasound waves to penetrate deeper into tissues diminishes.

This limitation arises because higher frequency sound waves are absorbed more quickly by biological tissues. The attenuation of sound increases with frequency, meaning that while you can get clearer images of nearby tissues, you lose the ability to see deeper structures effectively. As a result, when deeper organs or areas need to be examined, lower frequencies are often preferred despite their lower resolution, as they can penetrate tissues more effectively and provide adequate imaging capabilities over greater depths.

In contrast, related options may discuss aspects like sound penetration or potential comfort factors, but they do not capture the primary issue tied to the choice of frequency in terms of imaging capability.