| 摘要 |
A spiral scan MR imaging method is provided for acquiring an image of a specified section taken through an object, wherein the section has a generally elongated shape. Thus, first and second dimensions of the section, measured along first and second mutually orthogonal section reference axes, respectively, have a relationship such that the first dimension is substantially greater than the second dimension. The method includes the step of applying spatially selective RF excitation to an imaging volume containing the object, in order to select a slice which includes the specified section. The method further includes the step of generating a read-out gradient defining a selected anisotropic spiral trajectory in an associated k-space domain having first and second mutually orthogonal k-space reference axes, which respectively correspond to the first and second section reference axes. A set of data samples is acquired during an acquisition period, each of the data samples corresponding to a sampling point on the anisotropic spiral trajectory, the spacing between adjacent sampling points measured along the first k-space axis being substantially less than the spacing therebetween measured along the second k-space axis.
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