MRI enhancement scan is an intravenous injection of contrast agent during the MRI scan and then the MRI scan, the purpose of which is to use enhancement scanning to obtain more information on the MR image when the MR image does not produce good contrast during the MR scan. Magnetic resonance (MR) has excellent soft-tissue resolution, but when the biophysical properties of normal and diseased tissues are not very different, MR scanning images do not produce good contrast, and then MR enhancement scanning with MR contrast agents is needed. By affecting the relaxation time (T1 or T2) of protons to enhance or reduce the signal intensity of the tissue, the contrast between the lesion and the tissue is artificially increased, thus obtaining more image information that is not shown in the MRI flat scan, which can better help the diagnosis of the disease.