This technique utilizes a standard magnetic resonance imaging (MRI) machine to analyze the molecular components of a region of tissue in the brain non-invasively. MRS techniques largely focus on the hydrogen or phosphorus atoms which are components of living tissue to characterize and quantify certain molecules within a tissue region which can, in turn, be utilized to gauge the energy stores or utilization in a region or the ratio of neuronal to non-neuronal tissue. This technique has been employed to non-invasively differentiate between tumors, strokes and other lesions (e.g. demyelinating lesions). It has also been utilized in patients with epilepsy to better identify the focus or foci of a patient’s seizures.