Enhanced Echo-Planar Magnetic Resonance Imaging
AssigneeSiemens Healthineers AG
InventorWei Liu
Life of this patent
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Abstract
Enhanced EPI techniques are described that acquire and record a second set of scan data with the same flyback trajectory as that used to acquire a first set of scan data, only with a shifted starting point. Doing so ensures that both Nyquist ghosting and flow ghosting can be improved without changing a necessary echo spacing. This also reducing imaging distortion and chemical shift, and without changing the bipolar readout gradient. A full set (according to Nyquist) of all k-space lines can be yielded for each polarity of the bipolar readout gradient.
Claims14
A method for acquiring scan data of a region of interest of an examination object using an echo-planar imaging (EPI) technique, the method comprising:
- recording a first set of scan data in at least two shots using a flyback trajectory;
- and
- recording a second set of scan data using the same flyback trajectory used for the first set of scan data, but with the starting point shifted in the phase-encoding direction.
A magnetic resonance system, comprising:
- a scanning region configured to receive an examination object;
- and
- a controller configured to acquire scan data of a region of interest of the examination object using an echo-planar imaging (EPI) technique by:
- recording a first set of scan data in at least two shots using a flyback trajectory;
- and
- recording a second set of scan data using the same flyback trajectory used for the first set of scan data, but with the starting point shifted in the phase-encoding direction.
A non-transitory computer-readable medium having instructions stored thereon that, when executed by a controller of magnetic resonance (MR) system, cause the MR system to:
- acquire scan data of a region of interest of an examination object using an echo-planar imaging (EPI) technique by:
- recording a first set of scan data in at least two shots using a flyback trajectory;
- and
- recording a second set of scan data using the same flyback trajectory used for the first set of scan data, but with the starting point shifted in the phase-encoding direction.
Dependencies are inferred from the claim text.