I. What is cerebral angiography? Cerebral angiography is a diagnostic method that uses a needle to pierce a small hole at the root of the thigh, inserts a catheter from the femoral artery, and injects iodine contrast into the artery through the abdominal, thoracic, and cervical vessels to visualize the vessels, and then takes a rapid and continuous film to get a comprehensive understanding of the cerebral vascular condition. Normal cerebral angiography orthopantomogram; normal cerebral angiography lateral image Why do cerebral angiography? The basis for the most effective management of stroke, whether hemorrhagic or occlusive, is to understand the underlying cause of the disease. Any blind treatment may aggravate the patient’s condition or lose the best time for treatment. A comprehensive cerebral angiogram is the best choice for a clear diagnosis. It not only provides visualized real-time images of the neck and cerebral vessels, but also fully shows the dynamic changes in the cycle, morphology, distribution and course of the entire circulation process from arteries to veins, enabling clinicians to fully understand and judge the possible causes of stroke, the onset of the disease, and the extent of the lesion, so that the best treatment can be chosen. This is also the basis for ensuring that the source of the disease is identified, not misdiagnosed and that every effort is made to save the patient.