Magnetic resonance imaging is a noninvasive imaging method used for visualizing structures in the body. The participant is placed in a strong static magnetic field that aligns all atomic nuclei in the body. A radiofrequency pulse is applied at a resonant frequency to selectively energize one type of atom (typically hydrogen). When the pulse is discontinued, the energy is emitted and detected by a detector coil. Due to the differences in concentrations of atoms in different structures, this energy can be used to reconstruct an image of the tissue in the detector coil.