ABSTRACT
Magnetic resonance imaging (MRI) is an imaging technique that makes use of the phenomenon of nuclear spin resonance. The principal idea of MRI is based on the fact that when a magnet is exposed to an external magnetic field, it tries to orient itself to align with the external magnetic field. This idea explains why the spin-axis of the protons in the atoms of biological tissues exposed to the MRI’s large magnetic field will orient itself to a direction parallel to the magnetic field lines. In most cases the magnetic resonance is tuned to imaging of the magnetic spin of the hydrogen nuclei in water molecules. Measuring the spin information for a group of molecules provides the means of creating an MR image of the biological tissue under study.
