In clinical and research MRI, hydrogen atoms are most often used to generate a macroscopic polarization that is detected by antennae close to the subject being examined. Certain atomic nuclei are able to absorb radio frequency energy when placed in an external magnetic field the resultant evolving spin polarization can induce a RF signal in a radio frequency coil and thereby be detected. MRI was originally called NMRI (nuclear magnetic resonance imaging), but 'nuclear' was dropped to avoid negative associations. Additionally, implants and other non-removable metal in the body can pose a risk and may exclude some patients from undergoing an MRI examination safely. However, it may be perceived as less comfortable by patients, due to the usually longer and louder measurements with the subject in a long, confining tube. Compared to CT, MRI provides better contrast in images of soft-tissues, e.g. MRI is widely used in hospitals and clinics for medical diagnosis, staging and follow-up of disease. MRI is a medical application of nuclear magnetic resonance (NMR) which can also be used for imaging in other NMR applications, such as NMR spectroscopy. MRI does not involve X-rays or the use of ionizing radiation, which distinguishes it from CT and PET scans. MRI scanners use strong magnetic fields, magnetic field gradients, and radio waves to generate images of the organs in the body. Magnetic resonance imaging ( MRI) is a medical imaging technique used in radiology to form pictures of the anatomy and the physiological processes of the body. Nuclear magnetic resonance imaging (NMRI), magnetic resonance tomography (MRT)

Para-sagittal MRI of the head, with aliasing artifacts (nose and forehead appear at the back of the head)

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