"Although complex, the theory behind the practice of magnetic resonance spectroscopy is based on the fact that, when surrounded by a magnetic field, atomic nuclei may be disrupted by radio frequency waves at specific frequencies, which cause the nuclei to generate signals that can be detected by a radio receiver. These signals can then be converted into meaningful information in the form of spectra, which can subsequently be interpreted to gain information concerning the chemical composition at the region of interest (ROI). Central to the theory behind MRS is the concept of atomic spin, which designates a physical property of subatomic particles. The overall spin of a nucleus is determined by its mass number, the total number of protons and neutrons it contains: an even mass number results in no net spin, whereas an uneven mass number results in a net spin."