Patent ID: 6552540
Filing Date: 2003-04-22
Classification: G01R

Abstract:
A magnetic resonance method for forming a fast dynamic image, comprising the steps of:providing an array of multiple sensors, providing a sensitivity map of each of the sensors prior to imaging, arranging the sensors such that at least two adjacent sensors operatively record signals originating from a common imaging position whereby the signals are multiplied by a sensitivity factor of the respective sensor at the respective imaging position obtained from the sensitivity maps and image intensity is calculated from the signals measured by the sensors, performing fast dynamic imaging to obtain fast dynamic images from a plurality of signals acquired by the sensors while the number of phase encoding steps is reduced from a full set of phase encoding steps, acquiring a normal magnetic resonance image with the full set of phase encoding steps for each sensor prior to formation of the fast dynamic images, extracting a subset of phase encoding trajectories from the normal image acquired prior to formation of the fast dynamic images commensurate with the phase encoding trajectories obtained by the fast dynamic imaging, reconstructing an image from the subset of phase encoding trajectories, comparing the signals of an initial fast dynamic image and the signals of the reconstructed image to obtain an estimate of fold-over artefacts in the initial fast dynamic image, and compensating for the signals of the fold-over artefacts in the signals obtained by the fast dynamic imaging for subsequent fast dynamic images using the estimate of the fold-over artefacts in the initial fast dynamic image to thereby obtain corrected fast dynamic images.