MRIs are usually done without needles, and needles are only buried for the purpose of injecting a contrast agent when an enhanced MRI is done. Contrast agents are generally paramagnetic, and the commonly used contrast agent is gadopentetate dextran, which has a low allergy rate, so there is no need to test for sensitization, but there are many contraindications, and not all people are suitable for MRI enhancement scans. The purpose of injecting contrast agent shots is to detect diseases such as occupying lesions by plain scanning. MRI enhanced scanning can clearly show the size and location of the occupying space, the relationship between the surrounding tissues, the blood supply and so on, which can provide more information for the clinic, and provide a suitable and reasonable method for the treatment plan.