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The patient is placed in a scanner between the poles of a large magnet that produces a strong, uniform magnetic field. The magnetic field causes all hydrogen nuclei within the body to precess with the same Larmor frequency.
A pulse of radio frequency (RF) of the same frequency as the Larmor frequency is applied to the precessing nuclei; the nuclei absorb energy and resonate. When the RF pulse ends, the resonating hydrogen nuclei return to their equilibrium position after a short period of time, emitting the RF energy in the process.
The RF energy is picked up by the RF coil and sent to the receiver. This signal is sent to a computer, which decodes the information in order to construct an image of the number density of the hydrogen for the patient.
In other that hydrogen nuclei in only one small part of the body may be detected, a non-uniform magnetic field is also applied across the patient. This results in different magnetic field strengths at each point in the body, hence different Larmor frequencies. The particular magnetic field and the radio frequency emitted enable the hydrogen nuclei in the part of the body under investigation to be located.
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