In order to achieve higher levels of X-ray attenuation than observed for biological tissue,elements of higher atomic number (Z) are incorporated into the contrast agent molecule. Sodiumiodide (NaI) was among the first water-soluble imaging agents. Compare mass attenuationcoefficients for soft tissues and for sodium iodide.

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In order to achieve higher levels of X-ray attenuation than observed for biological tissue,
elements of higher atomic number (Z) are incorporated into the contrast agent molecule. Sodium
iodide (NaI) was among the first water-soluble imaging agents. Compare mass attenuation
coefficients for soft tissues and for sodium iodide.

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