Nuclear magnetic resonance imaging (NMRI)


Currently used nuclear magnetic resonance (NMR) instruments come in two forms: continuous wave (CW) and pulsed Fourier transform (PFT).

Currently used nuclear magnetic resonance (NMR) spectrometers come in two forms: continuous wave (CW) and pulsed Fourier transform (PFT). Continuous wave NMR spectrometers mainly consist of a magnet, radio frequency transmitter, detector and amplifier, and recorder (see Figure 8-5). The magnet is used to generate a magnetic field, and there are three main types: permanent magnet, magnetic field strength 14000G, frequency 60MHz; electromagnet, magnetic field strength 23500G, frequency 100MHz; superconducting magnet, frequency up to 200MHz or more, up to 500~600MHz. Instruments with higher frequencies have better resolution, higher sensitivity, and simpler spectra that are easier to analyze. The magnet is equipped with a scanning coil to ensure that the magnetic field generated by the magnet is uniform and can change continuously and accurately within a relatively narrow range. The radio frequency transmitter is used to generate electromagnetic radiation waves of a fixed frequency. The detector and amplifier are used to detect and amplify the resonance signal. The recorder plots the resonance signal as a resonance spectrum.
Pulsed Fourier transform NMR spectrometers emerged in the mid-1970s, enabling rapid advancements in 13C NMR research.

Nuclear magnetic resonance, frequency, magnet, used to generate continuous resonance, appearing radio frequency

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