ABSTRACT
Imaging of human internal organs with exact and non-invasive methods is very important for medical diagnosis, treatment, monitoring and follow-up. Magnetic resonance imaging (MRI) is one of the advanced, reliable and harmless imaging techniques. It uses radio waves and magnetic field to generate image of the affected part of the body whereas CT examinations and X rays use ionizing radiations. MRI has replaced several invasive modes of examination and thereby reduced the risk and discomfort for many patients. MRI is based on the interaction of magnetic properties of hydrogen with both a large external magnetic field and radio waves, which results in the production of highly detailed images of the human body. MRI is safe but if patient‟s safety parameters are overlooked it can cause life threatening situation so great care needs to be taken by the radiologist, medical physicist, technologist and nurses conducting MRI examination. This paper provides a brief history of MRI, MRI Physics, working principle, MRI applications in medical diagnosis, MRI contrast agents and MRI safety concerns.
 

Key words: MRI, Image quality, MRI Physics, MRI working Principle, Diagnosis, MRI Safety.