Another term for detector, by analogy to broadcast radio receivers. Other terms used for devices of this type include modulators, phase sensitive detector and mixers.
• Share the entry 'Demodulator':
Searchterm 'Demodulator' was also found in the following service:
Part of the receiver that demodulates the RF signal and converts it to a lower frequency signal. Most detectors are phase sensitive (e.g., quadrature detector / demodulator) and will also give phase information about the RF signal.
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.
The portion of the MRI equipment that detects and amplifies the RF signals picked up by the receiver coil. Includes a preamplifier, MR signal amplifier, and demodulator. Phase sensitive detectors (electronic device in which the output is dependent on the instantaneous difference in phase between two input signals) are used to down-convert the MR signal to audio-frequencies prior to digitization.