NMR tomography method based on NBSEM with 2D spatial encoding by two mutually rotated multipole gradient fields

摘要

A nuclear magnetic resonance (NMR) imaging method in which, with the aid of a gradient system, a spatially and temporally variable magnetic field Bgrad is generated, for the at least two-dimensional spatial encoding of NMR measurement signals in a measurement sample region to be imaged, where the magnetic field Bgrad is employed in at least two forms Bgrad1 and Bgrad2 in the measurement sample region to be imaged during a single measurement cycle from excitation to reading of the NMR measurement signals, where the first form Bgrad1 has essentially ns poles, where ns is an even number >=2, and has ns essentially sectorial sub-regions, in each of which the magnetic field Bgrad is locally monotonic in one direction, where the measurement signals from the measurement sample are recorded by means of at least ns receiver coils which have different sensitivity over the ns sub-regions of the region to be imaged, is characterized in that the second form Bgrad2 is essentially identical to the first form Bgrad1, with the second form Bgrad2 being rotated by an angle Deltaphi, where $\mathrm{Delta}\varphi =\frac{360°}{2.\mathrm{ns}},$ relative to the first form Bgrad1. The invention provides an NMR imaging method in which a high-resolution image of the region to be imaged is obtained more quickly utilizing the advantages of NBSEMs.