Veterinary Technician

Category - Imaging

Which is an example of a negative contrast agent?
  1. Barium
  2. Iodine
  3. Air
  4. None of the above
Explanation
Answer: C - An example of a negative contrast agent is air. Nitrous oxide and carbon dioxide are also negative contrast agents. Negative contrast agents do not absorb radiation and produce a decreased radiographic density.
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