Propeller mr imaging with artefact suppression

Abstract

The invention relates to a method of MR imaging of a body (10) of a patient. It is an object of the invention to provide a method that enables efficient compensation of image artefacts in combination with PROPELLER imaging. The invention proposes to combine k-space blades in image space, and not in k-space like in conventional PROPELLER imaging. Local image artefacts are detected and corrected in single-blade MR images. The artefact detection and correction in the image domain prior to combining the single-blade MR images into a final MR image results in an improved image quality by better suppression of local artefacts and, thus, an increased signal-to-noise. Moreover, the invention relates to a MR device (1) and to a computer program for a MR device (1).

Description

technical field [0001] The present invention relates to the field of magnetic resonance (MR) imaging. It relates to a method for MR imaging of a body part placed in an examination volume of an MR device. The invention also relates to an MR device and a computer program to be run on the MR device. Background technique [0002] Imaging MR methods that utilize the interaction between magnetic fields and nuclear spins to form two-dimensional or three-dimensional images are widely used today, especially in the field of medical diagnosis, because they are superior to other imaging in many respects for soft tissue imaging method, does not require ionizing radiation and is usually not invasive. [0003] According to the general MR method, the body of the patient to be examined is placed in a strong uniform magnetic field B 0 , its orientation also defines the axis (usually the z-axis) of the coordinate system to which the measurement is related. Magnetic field B 0 Different ene...

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Problems solved by technology

Furthermore, due to the weighted averaging of k-space lobes, when parallel imaging like SENSE is used for MR data acquisition, PROPELLER 'averages' by e.g. B 0 Further imaging artifacts due to inhomogeneity or inaccurate coil sensitivity maps

[0009] However, a disadvantage of the known PROPELLER method arises from the fact that image artifacts (such as e.g. SENSE artifacts) caused by inaccurate coil sensitivity maps (appearing as ghosting in the final MR image), usually appear only in the overlay Flow artifacts within a small band of part of the MR image, or B at the air / tissue interface that often occurs within the MR image 0 Inhomogeneity only has a local effect in the image domain, i.e. image artifacts appear only in restricted regions within the MR image

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