Method and apparatus for correction of artifacts in magnetic resonance images

摘要

In a method and apparatus for the correction of artifacts in magnetic resonance images (MR) acquired with an MR pulse sequence in which gradients are switched simultaneously during the radiation of at least one non-selective excitation pulse, measurement data acquired with the pulse sequence in k-space are loaded into a processor, in which a perturbation matrix is determined on the basis of spatial and k-space point data of the acquired measurement data and the gradients used during the excitation. A corrected image is calculated from the acquired measurement data in k-space and the perturbation matrix, with the calculation of the corrected image including a matrix inversion of the perturbation matrix. The corrected image is then stored or displayed.

主权项

1. A method for correction of artifacts in magnetic resonance (MR) resonance images, comprising:
entering MR measurement data, acquired with a pulse sequence in which gradients are activated simultaneously during radiation of at least one non-selective excitation pulse, into a memory representing k-space; from a processor, accessing said MR measurement data in said k-space memory and, in said processor, determining a perturbation matrix on spatial data of the acquired MR measurement data, and said measurement data in k-space, and the gradients used in said sequence; in said processor, inverting said perturbation matrix to obtain an inverted perturbation matrix, and calculating a corrected image from the MR measurement data in k-space and the inverted perturbation matrix by a matrix multiplication of said inverted perturbation matrix with said MR measurement data in k-space; and making said corrected image available as a data file at an output of said processor.