Wikipedia
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A contrast agent (or contrast medium) is a substance used to increase the contrast of structures or fluids within the body in medical imaging.
‎Radiocontrast media · ‎Ultrasound contrast agents
Contrast medium | Radiology Reference Article
Radiopaedia
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2019年6月27日 — Contrast media are a group of chemical agents developed to aid in the characterization of pathology by improving the contrast resolution of ...
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