Which statement best describes an advantage of ultrasound compared to CT or MRI?

• A. It uses ionizing radiation
• B. It is slower than CT or MRI
• C. It is always more detailed than CT or MRI
• D. It is cheaper, portable, and does not use ionizing radiation

Answer: (D)

Ultrasound’s strongest practical advantage is that it is cheap, portable, and uses no ionizing radiation, while also providing real-time imaging at the bedside. This combination makes it ideal for rapid assessment, guiding procedures, and use in settings where CT or MRI aren’t readily available. In contrast, CT involves ionizing radiation, and MRI is more expensive, less portable, and usually slower. While CT or MRI can offer greater detail in certain situations, the key benefit of ultrasound is its accessibility, safety, and immediate, bedside usability.