An MRI scan is performed inside a large tube-shaped machine containing a powerful magnet. The patient is asked to lie on a flat table that slides into this tube. The machine works by aligning protons (positively charged nuclei) in the water atoms within the body using the strong magnetic field. Short bursts of radio waves are then sent, knocking the protons out of alignment. When the radio waves are turned off, the protons realign and release signals that are picked up by the machine's receivers. These signals are processed by a computer to create detailed cross-sectional images of the body's tissues and internal structures. The scan may require the injection of a contrast agent (dye) intravenously to enhance the visibility of certain structures like blood vessels or some types of diseased tissue. The scan typically takes from 15 to 90 minutes depending on the area being examined and the number of images required. It is considered a safe procedure as it does not use ionizing radiation.