METHOD AND MAGNETIC RESONANCE APPARATUS TO CORRECT MAGNETIC RESONANCE MEASUREMENT DATA

摘要

The method according to the invention for the correction of measurement data acquired along Cartesian lines in k-space, which measurement data have been acquired by means of a pulse sequence in which gradients are switched simultaneously during the radiation of at least one non-selective excitation pulse, includes the steps of measurement data acquired with the pulse sequence are entered into k-space, i.e. entered into a memory organized as k-space, a pulse excitation profile is determined, and the acquired measurement data are corrected using the pulse excitation profile, the correction including an de-convolution operation in at least one of the three k-space directions. The correction of measurement data according to the invention allows an unrestricted use of pulse sequences, in particular gradient echo sequences, in which an excitation is implemented given already activated gradients (for example for noise reduction). A distortion due to superposition of an excitation with a pulse profile can be remedied via the method according to the invention.

主权项

1. A method for correcting magnetic resonance (MR) measurement data, comprising:
entering MR measurement data along respective Cartesian lines in an electronic memory organized as k-space, wherein k-space in said memory comprises three orthogonal Cartesian directions, said MR measurement data having been acquired by operating an MR apparatus with a pulse sequence in which gradients are activated simultaneously during radiation of at least one non-selective excitation pulse; determining a pulse excitation profile of said excitation pulse; and in a computer provided with said pulse excitation profile and having access to said memory, correcting said acquired measurement data in k-space using said pulse excitation profile by executing an de-convolution operation in at least one of said three orthogonal directions in k-space.