chapter  2
6 Pages

MRI Physics Principles

Magnetic resonance imaging (MRI) uses the hydrogen atoms in the body to generate an image. When hydrogen atoms are introduced into a magnetic eld, they align in the direction of the magnetic eld (Bo). A radio-frequency (RF) pulse is then applied, which provides energy to the atoms and causes some to be aligned in different directions. When the RF pulse ceases, the atoms return to their rest position, releasing energy and emitting a signal. This signal is picked up and converted into an image.