| 摘要 |
An MR method for determining the spatial distribution of the nuclear magnetization in an examination region, includes exciting the nuclear magnetization in the examination region, one or more times by means of at least one RF pulse in the presence of a steady, uniform magnetic field and reading the MR signals arising after the excitation in order to produce MR data, magnetic gradient fields acting on the examination region during the reading. These magnetic gradient fields are varied in such a manner that the MR signals in the spatial frequency domain are acquired along one or more spirals, the density of the spirals or their turns in the central part of the spatial frequency domain, corresponding to the low spatial frequencies, being greater than that in the remainder of the spatial frequency domain, the spirals in the remainder of the spatial frequency domain covering, together with their mirror-images, the remainder with a density which suffices for the reconstruction, and a nuclear magnetization distribution for the examination region is reconstructed from the MR data.
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