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Which of the following agents should not be used as an agent for fluoroscopy?

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Which of the following agents should not be used as an agent for fluoroscopy?

(a) Silver

(b) Bismuth

(c) Thoria

(d) Tungsten

The question was posed to me in my homework.

Question is from Fluoroscopy in chapter Diagnostic Investigation via Imaging Techniques of Clinical Science

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The correct option is (c) Thoria

Best explanation: Thoria stands for thorium dioxide. It was found to cause liver cancer so the use of thoria as an agent for fluoroscopy was discontinued. All the other three materials are still used for fluoroscopy but the dyes most preferred are made from iodine.

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