Are CT Scans still effective without dye or contrast?

Are CT Scans still effective without dye or contrast?
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Answer :

answer:I don’t know much on the topic, but I think the dye shows blood vessels and blood flow most of all. If you had contract with your MRI, which would be an MRA I believe, then they likely already saw that, and the CT will show different things not picked up by the MRI/MRA. CT contrast is very taxing on the kidneys, so if you don’t need it, better not to get it, especially if you are older. Sorry to hear about the tumour, I hope everything will be ok.
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