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| Contrast agents ： ウィキペディア英語版 |
Contrast medium
A medical contrast medium (or contrast agent) is a substance used to enhance the contrast of structures or fluids within the body in medical imaging. It is commonly used to enhance the visibility of blood vessels and the gastrointestinal tract.
==Types==
Several types of contrast media are in use in medical imaging and they can roughly be classified based on the imaging modalities where they are used. Although other types exist, most common contrast agents work based on X-ray attenuation and magnetic resonance signal enhancement.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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