METHOD AND APPARATUS FOR ACQUIRING A MAGNETIC RESONANCE IMAGING DATASET

摘要

In a method and apparatus for acquiring a magnetic resonance imaging dataset of an area to be examined of a patient by magnetic resonance data are acquired over a prespecified acquisition period which has been fixed for the acquisition process. This acquisition period is divided into a number of sub-periods. For each sub-dataset of the magnetic resonance data acquired by undersampling in a sub-period, at least one motion value describing the motion status of the area to be examined is determined, and the data subsets to be used for the reconstruction of the magnetic resonance imaging dataset are selected in dependence on the motion values in order to minimize motion artifacts.

主权项

1. A method for acquiring a magnetic resonance imaging data set of an examination region of a patient, comprising:
providing a control computer with a predetermined acquisition period for a data acquisition procedure for operating a magnetic resonance data acquisition scanner to acquire magnetic resonance raw data from an examination region of a patient and, in said control computer, dividing said acquisition period into a plurality of sub-periods; using said control computer to operate said scanner to execute said data acquisition procedure to acquire said raw magnetic resonance data from the examination region in each of said sub-periods individually, and entering the acquired raw data for each sub-period into an electronic memory representing k-space, thereby obtaining a plurality of data subsets in k-space respectively for the sub-periods, with each data subset being undersampled in k-space; for each sub-period, determining a motion value that represents a motion status, during the respective sub-period, of said examination region; in an image reconstruction computer, executing an image reconstruction algorithm to reconstruct an image of the examination region from said magnetic resonance raw data in k-space and, in said reconstruction algorithm, selecting data subsets from said electronic memory according to a selection criterion that minimizes motion artifacts in said image, and using only the selected data subsets in said reconstruction algorithm to reconstruct said image; and making the reconstructed image of the examination region available in electronic form from said reconstruction computer as a data file.