Exam-style question
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How do positive and negative contrast media differ in their application?.
- A.Positive contrast media increase radiopacity, while negative contrast media decrease it
- B.Positive contrast media are used for soft tissues, while negative contrast media are used for bones
- C.Positive contrast media are always liquid, while negative contrast media are always solid
- D.Positive contrast media are used in all imaging, while negative contrast media are not
Model answer
What a good answer should say
- Positive contrast media increase radiopacity, while negative contrast media decrease it
Explanation
Why this works
Positive contrast media, such as barium, absorb more X-rays, making structures appear brighter on the image. In contrast, negative contrast media, like air, absorb fewer X-rays, making areas appear darker.
This distinction is important for highlighting different tissues during imaging.
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