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The imaging technique for anatomy and physiological processes in the living body.

In Magnetic Resonance Imaging (MRI), a radio wave is sent into the body where it excites the nuclei of certain atoms, such as the hydrogen atom. In turn, these excited atoms emit radio waves that are detected with an antenna outside the body.

In order to locate the nuclei in the body, the magnetic field is spatially and temporally modulated over the body. This encoding process leads to slight perturbations of the magnetic field that can compromise the quality of the MR image.

When these field perturbations are known, accurate and ultra-fast MR imaging is possible.

PS: MRI is not to be confounded with CT (computed tomography), where an image is computed from a number of X-ray projections (tomography).

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