Which radiographic density corresponds to metal?

Which radiographic density corresponds to metal?

• A. Air
• B. Fat
• C. Water
• D. Metal

Answer: (D)

On a radiograph, density reflects how much X-ray energy is absorbed by a material. Metals have very high atomic numbers and electron density, so they attenuate X-rays far more than soft tissues. This strong attenuation makes metal appear as the brightest, most radiopaque area on the image. In contrast, air absorbs almost nothing and shows up black, fat is gray, and soft tissue (water) is a lighter gray. So metal is the radiographic density that shows up as the white, highly radiopaque appearance.

On a radiograph, density reflects how much X-ray energy is absorbed by a material. Metals have very high atomic numbers and electron density, so they attenuate X-rays far more than soft tissues. This strong attenuation makes metal appear as the brightest, most radiopaque area on the image. In contrast, air absorbs almost nothing and shows up black, fat is gray, and soft tissue (water) is a lighter gray. So metal is the radiographic density that shows up as the white, highly radiopaque appearance.