Medicine is the branch of health science and the sector of public life concerned with maintaining or restoring humanhealth through the study, diagnosis and treatment of disease and injury. It is both an area of knowledge—a science of bodysystems, their diseases and treatment—and the applied practice—an art or craft—of that knowledge. However, medicine often refers more specifically to matters dealt with by physicians and surgeons.
MRI should not be confused with the NMR spectroscopy technique used in chemistry, although both are based on the same principles of nuclear magnetic resonance. In fact MRI is NMR applied to the signal from water to acquire spatial information in place of chemical information about molecules. The same equipment can be used for both imaging and spectroscopy.