| 摘要 |
Imaging of 1-, 2-, or 3-dimensional specimens is effected based on nuclear magnetic resonance of a chemical species. A specimen is placed in an essentially constant magnetic field Ho, exposed to an electromagnetic pulse, and exposed to an an additional magnetic field H1 whose strength is linearly increasing across the specimen. A free induction decay signal is sampled after field H1 is turned off, and sample values are stored for later processing. These steps are carried out repeatedly for different fields H1, and stored sample values are Fourier transformed into desired frequency spectra at points in the specimen.
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