Currently the commonly used MRI machines are 1.5T and 3.0T, the difference between these two machines is the strength of the magnetic field is different. 1.5T MRI cranial scanning cost is 600 dollars, 3.0T MRI cranial scanning cost is 750 dollars. The advantage of MRI is that it can show ultra-early infarction lesions, while fresh infarction lesions within 6 hours are not visible on CT, so patients with cerebrovascular disease still prefer MRI. However, there are certain requirements for MRI, if the patient has recently put a stent in the body, there are metal-like implants in the body, the patient is not allowed to do MRI.