A 67-year-old female asked:
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Nsclc st4. Diagnostic CT scans used iodine contrast but due to allergy, post treatment CT scans used barium. How accurate/comparable are the scans?

1 doctor answer
Dr. Matthew Solhjem
20 years experience in Radiation Oncology
CT.: Iodine contrast highlights the vessels on ct (arteries/veins) so it is easier to detect lymph nodes or other tumors. Barium highlights the stomach, small and large intestine. This allows easier detection of abdominal tumors. A ct without contrast is difficult to interpret. Could consider MRI with gadolinium contrast (different than iodine) if need be. Best discussed with your oncologist.
Answered on Jun 10, 2014

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