White Matter fibers Studying through Fiber Tracking in MRI (PART 1) Magnetic Resonance Imaging (MRI) is an acquisition and reconstruction imaging technique that is used for medical purposes. In comparison to other diagnostic techniques, the MRI is one of the most versatile tools to use. It offers morphological, kinetic, functional, and biochemical information of different human body parts. MRI technique, takes advance from the reception and images. MRI’s signals generated will be different on the strength on particular surrounding where protons are. In addition, the big potentialities, the big possible research areas, and the lack of clinical contraindication, permitted on exponential progression of the methodology changing in a deep way the role of radiographer. In particular, Diffusion Tensor Imaging (DWI) and Fiber Tracking represent a new technique of Neuroimaging in the determination of microstructural brain demage. In 90’s was introduced the possibility of rebuild white matter’s axonal tracks though a technique: Fiber Tracking. The principle on which is based the major part of Fiber Tracking technique is about water molecules present in regions where axons are aligned along the same direction where molecules are parallel to the axons diffuse in a faster way. The fiber tracking represents the only non-invasively technique to identify the axon tracks in the white matter. They do not only evaluate the entity of diffusion phenomenal, they also represent the direction of the diffusion. This technique is mainly applied to the white matter of brain which is organized in the fiber axon. When the diffusion does not happen in all the directions, but along one preferentially direction it is defined “Anisotropic”. The fibrillar structure of the white matter made of axonal tracks induce the water molecules diffusion aligned to be parallel to them.