A specialist injects dye into the arteries, which creates a map
of your arteries and the aneurysm on xrays.
CT can reveal blood flow in your brain and show aneurysm location. Sometimes a dye may be injected into a vein to highlight blood flow in your arteries and veins, CT angiogram and provide additional detail regarding appearance of brain aneurysm. MRI can create detailed images of your brain and show aneurysm’s location. Hope this helps. Take care.