All of the following are true about iodinated intravascular contrast media except –

MRI functions through different principles and thus utilizes different contrast agents. Gadolinium is the most commonly used contrast in MRI. Both gadolinium-based and iodinated contrast media are used for digital subtraction angiography. Radiocontrast agents are radiopaque. Radiocontrast agents are excreted by the kidney. Radiocontrast agents can cause anaphylactoid reaction and nephropathy.