Hello and welcome to MedHelp's forums. Thank you for your question. Please speak to the prescribing doctor of this test as well as the center in which you would undergo the CT scan. Not all CT's use contrast dye. They should be able to use an alternative for you if you have a known allergy. https://www.sciencedirect.com/science/article/pii/S0741521412021143
Let us know how this turns out. Best of luck to you.