Iohexol is a raw material for water-soluble, non-ionic X-CT contrast agents produced by pharmaceutical companies. The trade name for this contrast agent is Orna Parker. This contrast agent is usually injected into the vein before CT diagnosis, for angiography, urinary system, spinal cord and femoral joint, lymphatic angiography, low contrast density, low toxicity, good tolerance, etc. One of the contrast agents is also a diagnostic drug.