MODEL RELEASED. Person undergoing a magnetic resonance imaging (MRI) brain scan, showing the radiographer at the control panel in foreground, with the subject lying through the coils of the scanner's magnets visible through the window. MRI is a diagnostic technique that provides revealing imagery of tissues & organs within the body. It is of special value in resolving the nervous tissue of the brain and spinal cord & in locating related diseases. Here, a mid-sagittal image of the (normal) subject's brain appears on the display at left. Features visible include the spinal cord and grey & white matter of the brain.