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est groups include CT and magnetic resonance imaging (MRI) agents. The contrast groups are not interchangeable. Additional, less commonly utilized contrast agents, including fluoroscopy based air or CO2, and molecular imaging (nuclear imaging), which will not be discussed in depth here. A contrast medium can be utilized internally or externally to a patient, and administration is frequently enterally or intravascularly. Intravascular can be arterial, venous, or lymphatic. This article will be limited to administration intravenously (IV).D