Protons are the preferred nucleus for imaging the human body types: human tissue containing large amounts of water and hydrocarbons, Proton NMR of high flexibility, strong signal, which is why people preferred Proton Imaging element as the human body. Protons in NMR signal intensity of the sample density, body water between various organizations in different proportions, number of protons of different, then the NMR signal intensity differences, using this as a feature, to separate the various organizations, it is the proton density magnetic resonance images. Between different tissues of the body, tissues and lesions in the organization between proton density, the relaxation time T1, T2 three-parameter differences, is the physical basis of MRI for clinical diagnosis of the main.
When the RF Pulse is applied, hydrogen and nuclear power state changes, RF, hydrogen nuclei return to their initial state and resonant electromagnetic waves emitted. Vibration of small differences in the nucleus can be accurately detected, after further processing, is likely to get response structure consisting of three dimensional image, from which we can include the Organization of water difference information as well as the movement of water molecules. In this way, changes can be recorded.
2/3 the weight of the human body for water, such a high proportion is magnetic resonance imaging based technology can be widely used in medical diagnosis. Moisture in the organs and tissues in the human body are not the same, many changes in the pathology of the disease process can cause moisture patterns, can be reflected by magnetic resonance imaging.