The so-called MR examination is an MRI. MRI is a very common means of imaging technology at this stage, and is used to determine some injuries and tumors that cannot be determined by X-rays and CT, and is relatively safe because there is no radiation. However, there are some patients who are not suitable for MRI, such as those with built-in body parts, short pregnancy, closed phobia, etc., including patients with non-MRI compatible heart stents. It works on the principle that the nucleus of an atom with a non-zero magnetic moment forms a Seeman split, and then the resulting frequencies and wave spectrum are absorbed and an image is formed.