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I am confused by this. It says the technique uses "A liquid radiocontrast agent, typically containing iodine," but the MeSH term scope note specifically says "a specific x-ray (not radionuclide) technique..." — Preceding unsigned comment added by Cranmills (talk • contribs) 17:14, 18 November 2011 (UTC)[reply]
A radiopaque substance is used in order to produce image not necessarily iodine based one. a specific or plain x-ray (radiograph) is not enough as it will not produce a image --Irvin calicut (talk) 09:52, 5 May 2014 (UTC)[reply]