Which pair of tissues has radiographic densities approximately equal to water?

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Multiple Choice

Which pair of tissues has radiographic densities approximately equal to water?

Explanation:
X-ray attenuation determines radiographic density: tissues that attenuate similarly appear with similar gray shades. Water and soft tissues share comparable attenuation, so they look alike on the image. Muscle is composed largely of water and protein, so its attenuation mirrors water closely, giving a similar mid-gray density. Fat contains more lipid and attenuates X-rays less, so it appears lighter than water and is not a close match. Therefore, the pair that shows densities approximately equal to water is muscle and water.

X-ray attenuation determines radiographic density: tissues that attenuate similarly appear with similar gray shades. Water and soft tissues share comparable attenuation, so they look alike on the image. Muscle is composed largely of water and protein, so its attenuation mirrors water closely, giving a similar mid-gray density. Fat contains more lipid and attenuates X-rays less, so it appears lighter than water and is not a close match. Therefore, the pair that shows densities approximately equal to water is muscle and water.

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