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4 Terms

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Positive Contrast Medium (Radiopaque)

has higher atomic weight than surrounding tissue, absorbs more photons, produces lower radiographic density than surrounding tissue

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Negative Contrast Medium (Radiolucent)

has lower atomic weight than surrounding tissue, absorbs less photons, produces higher radiographic density than surrounding tissue

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Gadolinium

chemical element with symbol Gd and atomic number 64, non-toxic paramagnetic contrast enhancement agent Gadolinium exhibits this due to 7 unpaired electrons

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Iodine

chemical element with symbol I and atomic number 53, non-metallic, used to enhance images using X-ray