A method and apparatus for magnetic resonance (MR) imaging of a moving
object, wherein motion data are acquired about movement of the object in
multiple dimensions during a "pre-scan" of the object, prior to the
acquisition of image data during a succeeding "imaging scan" of the
object. Because motions of the object in one dimension are to some degree
correlated with object motions in other dimensions, in accordance with
the invention, the pre-scan multi-dimensional motion data are used to
develop algorithms that relate the motion data of the object in a first
dimension to the motion data of the object in a second or third
dimension. Thus, during the subsequent acquisition of the image data
during the imaging scan, it is only necessary to measure the object
motion in one dimension, which measured data are then used in order to
estimate object movement in the other one or two dimensions using the
algorithms developed from the pre-scan motion data. The measured and/or
estimated motion data are then used to adjust the image data or image
plane, so as to reduce (or even prevent) image distortion due to object
motion.