METHOD AND APPARATUS TO GENERATE MAGNETIC RESONANCE DATA

摘要

In a method, a magnetic resonance system, and a computer-readable storage medium to generate magnetic resonance measurement data of an imaging area of an examination subject, the imaging area being located in a measurement volume of the magnetic resonance system, by operation of the magnetic resonance system, during the acquisition of the magnetic resonance measurement data, at least one additional nonlinear gradient is switched in addition to the gradients for spatial coding, and k-space is read out according to a random pattern, less densely than is required by the Nyquist condition.

主权项

1. A method to generate magnetic resonance data of an imaging area of an examination subject, comprising:
operating a magnetic resonance data acquisition unit, having a measurement volume in which said imaging area of the examination subject is situated, to excite nuclear spins in the imaging area by successively radiating radiofrequency (RF) excitation pulses and thereby causing said nuclear spins to emit echo signals; operating the magnetic resonance data acquisition unit to detect said echo signals after each radiated RF excitation pulse, while activating different magnetic field gradients that spatially encode said echo signals and reading out the spatially encoded echo signals; operating the magnetic resonance data acquisition unit to enter data representing the read-out spatially encoded echo signals into an electronic memory at respective data entry points in said memory organized as k-space, along trajectories of said data points that are predetermined by said gradients for spatial coding, according to a random pattern of said trajectories with a density of data entry points in k-space occupied by said read-out spatially encoded echo signals that is less than required by the Nyquist criterion, and with at least one additional non-linear magnetic gradient being activated in addition to said gradients for spatial coding; and generating a data file representing k-space into which said read-out spatially encoded echo signals have been entered, and making said data file available in electronic form as magnetic resonance measurement data of said imaging area.