Can brain CT detect smog disease? Smog disease is a relatively rare cerebrovascular disease, especially when the examination technology was less developed years ago, smog disease is rarely reported. However, in recent years, with the development and popularity of medical imaging technology, many hospitals can carry out related imaging examinations, and the incidence and detection rate of smog disease is gradually increasing. Can a brain CT detect smog? What is the standard test method? A normal brain CT cannot diagnose smog exactly, but can only detect cerebral infarction or cerebral hemorrhage caused by smog. DSA is the gold standard for diagnosing smog. It provides a comprehensive picture of the morphology and structure of the brain’s blood vessels, with clear images and high resolution, and provides a true three-dimensional image for observing vascular lesions and measuring the localization of blood vessel stenosis. The DSA image shows the stenosis or occlusion of the main branches of the cerebral arterial ring bilaterally in patients with smog, and the abnormal smoke-like network of tiny vessels at the base of the skull. In addition to DSA, CTA (CT angiography) and MRA (magnetic resonance angiography) are also useful for the diagnosis of smog. After these imaging tests, if the diagnosis of smog is confirmed, then surgery should be performed as soon as possible. Surgery is the only way to treat smog because the conservative medical approach is not very meaningful. Currently, combined vascular bypass surgery is the newest and most effective means to establish a complete blood supply to the brain and improve blood supply to the brain through direct and indirect intracranial and extracranial vascular anastomosis.