| 摘要 |
APPARATUS AND METHOD FOR MAGNETIC RESONANCE SPECTRAL IMAGING of the Invention: A method and apparatus for nuclear magnetic resonance imaging of NMR chemical spectra is disclosed. A chemically nonhomogeneous sample is placed within a static uniform magnetic field. A spatially uniform radio frequency excitation field B1 is imposed on the sample at a nonzero angle relative to the static magnetic field. A spatially nonuniform radio frequency detection field is superimposed on the static magnetic fields in the same region as the excitation field. The spatially nonuniform radio frequency detection field has a cusp shape surrounding a point of negligible radio frequency detection sensitivity. The point of negligible radio frequency detection sensitivity is sequentially positioned at each of a plurality of different positions within the sample. Signals corresponding to radio frequency energy absorption or radiation by the sample volume at each position are detected. A spatial distribution of the chemical compounds within the sample is calculated based on the NMR spectra detected.
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