What term describes substances that appear black on x-ray, such as air-filled spaces?

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Multiple Choice

What term describes substances that appear black on x-ray, such as air-filled spaces?

Explanation:
On X-ray images, dark areas correspond to radiolucent substances that let X-ray beams pass with little attenuation. Air-filled spaces are mostly air, a very low-density material, so they appear black. The term describing this appearance is radiolucent. In contrast, radiopaque refers to substances that absorb more X-rays and show up white, such as bone or metal. Anechoic and hyperechoic are ultrasound terms and don’t apply to X-ray imaging. So radiolucent best describes air-filled spaces on X-ray.

On X-ray images, dark areas correspond to radiolucent substances that let X-ray beams pass with little attenuation. Air-filled spaces are mostly air, a very low-density material, so they appear black. The term describing this appearance is radiolucent. In contrast, radiopaque refers to substances that absorb more X-rays and show up white, such as bone or metal. Anechoic and hyperechoic are ultrasound terms and don’t apply to X-ray imaging. So radiolucent best describes air-filled spaces on X-ray.

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