FDI Diagnostic Imaging Exam 1 Practice Exam

On CT, cortical bone appears which color?

White Dark gray It is not visible on CT Black

Correct Answer:

White

Explanation:

On CT, brightness reflects how much X-ray energy a tissue attenuates. Cortical bone has a high mineral content, so it attenuates X-rays strongly and appears as the brightest area—white—on the image. This high attenuation corresponds to high Hounsfield units, roughly around a thousand or more. In contrast, fat and softer tissues appear as mid-gray, while air appears black. So cortical bone is white on CT.

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