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Q101 (CDS-II/2022) Science & Technology › Biotechnology & Health › Medical imaging technologies Answer Verified

A patient's abdomen (alimentary canal) can be examined by X-ray after administering which one of the following metal salts in the patient's meal?

Result
Your answer: —  Â·  Correct: A
Explanation

Barium sulphate (BaSO4) is the metal salt used as a radiographic contrast agent for examining the alimentary canal, often referred to as a 'Barium meal' [1]. Barium has a high atomic number (Z=56), which allows it to effectively absorb X-rays and delineate the structure of the gastrointestinal tract, including the esophagus, stomach, and intestines. While most barium compounds are highly toxic due to the Ba2+ ion, barium sulphate is safe for medical use because it is extremely insoluble in water and body fluids, preventing the toxic metal from being absorbed into the patient's bloodstream [2]. It is typically administered as a chalky white powder mixed with water or as a suspension. Other salts like barium chloride are soluble and toxic, making them unsuitable for ingestion.

Sources

  1. [1] https://www.betterhealth.vic.gov.au/health/conditionsandtreatments/barium-tests
  2. [2] https://www.ncbi.nlm.nih.gov/books/NBK598777/
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