Metal detector coils can be used to find hidden ferromagnetic materials inside of clothes or the body of persons before entering a scanning room. Magnetic fields attract ferromagnetic objects with forces, which can be dangerous for humans and MRI machines.
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Detector that detects the phase of the signal relative to the phase of a reference oscillator. Phase sensitive detectors are used in MR transmitters (where they form part of the frequency synthesis pathway) and MR receivers (where they are used to down-convert the MR signal to audio-frequencies prior to digitization). This device type includes modulators, demodulators and mixers.
See Quadrature Detector.