| CPC G01R 33/4835 (2013.01) [G01R 33/4818 (2013.01); G01R 33/56536 (2013.01); A61B 5/055 (2013.01)] | 20 Claims |
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1. A method for acquiring magnetic resonance (MR) data with a compressed sensing technique in a predetermined volume section of an examination object using a magnetic resonance system, the method comprising:
ascertaining an extent of magnetic field distortion within the predetermined volume section;
applying a first gradient along a first direction;
radiating a radio frequency (RF) excitation pulse for selective excitation of a slice in the volume section while the first gradient is applied; and
acquiring the MR data in a volume of the volume section that is composed of the slice, a partial volume above the slice, and a partial volume, below the slice, the acquiring of the MR data comprising:
applying a first phase-encoding gradient along a second direction;
applying a second phase-encoding gradient along the first direction;
reading out the MR data in a k-space line while a readout gradient is applied along a readout direction; and
repeating the applying of the first phase-encoding gradient, the applying of the second phase-encoding gradient, and the reading out of the MR data multiple times,
wherein the first direction, the second direction, and the readout direction are mutually perpendicular,
wherein a set of k-space lines to be read out for the volume is determined in dependence on the extent of the magnetic field distortion, and
wherein a density function specifies a density for each point in a plane of a k-space.
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