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Magnetic Resonance Imaging

The MR image is actually a map of the very weak magnetization, originated from some of the atomic nuclei in the body tissue, in the presence of an external magnetic field. Since this magnetization is proportional to the density of those nuclei, the MR image shows the distribution of the selected atoms. Because of the large hydrogen concentration, soft tissue is easily seen in proton MR images, that show even the small differences due to their different chemical composition. The resulting soft tissue contrast is thus better that in X- ray techniques and can be further improved by methods that use the difference in dynamic behavior of the tissue magnetization.

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Image Formation. Ilustrative Photograph.