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Nuclear magnetic resonance imaging (NMRI) is used to obtain diagnostic information about internal body structures. State, during the use of NMRI, the function of:
the large constant magnetic field
the non-uniform magnetic field.
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The function of the large constant magnetic field is to cause all hydrogen nuclei within the body to align and precess with the same Larmor frequency which depends on the field strength.
The function of the non-uniform magnetic field is to enable the nuclei to be located and to change the position where nuclei are detected.
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