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RF modelling
In MRI, antennas around a patient (fig right) create a time-varying magnetic field in the patient. This field is also known as the RF field and oscillates at the Larmor frequency of the precessing hydrogen nuclei (spins). These spins absorb some of the energy of this magnetic field and after some time the hydrogen atoms will emit this excess energy in the form of a signal. In this signal information over the spatial location and its environment is entangled. After the signal is picked up by the antennas around the patient an image of the patient is reconstructed displaying the whole anatomy.
