Reducing motion artefacts in MRI

摘要

The invention relates to motion correction in magnetic resonance imaging (MRI), implemented as a MRI apparatus or system, computer programs for such, and a method. A motion pattern of a region of interest (ROI) is estimated by: selecting a fixed point at an anatomical position that is pre-determined to be little or not affected by motion and rotating a point in the ROI that is affected by motion on the basis of motion detected by a navigator or other methods. From the estimated motion pattern of the ROI, the field of view may be adapted by adjusting the gradients and the bandwidth of the RF pulses of the MR system in the acquisition sequence to avoid or reduce motion artefacts. Alternatively motion correction is carried out on the reconstructed images.

主权项

1. A method of compensating for motion of a region-of-interest (ROI) in a subject during magnetic resonance imaging (MRI), the method comprising acts of:
selecting within a first region of the ROI a fixed point pre-determined to be not affected by motion of the ROI and within a second region of the ROI a moving point pre-determined to be affected by the motion, the fixed point functioning as a field of view of an image produced by the MRI; and from the image
identifying a movement of the moving point within the ROI,determining a motion pattern by rotating the moving point relative to the fixed point in accordance with the identified movement of the moving point, andadjusting the field of view on the basis of the determined motion pattern to reduce motion artefacts of the image.