Contrast-enhanced examinations are more commonly used in clinical practice. MRI contrast is injected into the body through the blood vessels and travels to various sites as the blood flows through the vessels. If a lesion occurs, the absorption of the contrast agent will be changed, i.e. hemodynamic changes will occur. Malignant tumors are richly vascularized and require a lot of nutrients and occupy a lot of blood. After the contrast agent is injected, aggregation will occur, which can clarify the diagnosis. The main side effect of contrast agent is the occurrence of allergic reaction. In mild cases, the skin itches, and in severe cases, it can lead to death. At this stage, MRI contrast agent drug safety is high and allergic reactions are not easy to occur.