This invention relates to a method and apparatus for estimating artifacts in the image reconstruction of an object of interest (101). The inventive apparatus comprises a coil arrangement (105) comprising at least one transmitting coil (109, 109�) for generating a primary magnetic field to be applied to the object of interest (101), and at least one measurement coil (110, 110�) for measuring electrical signals induced by a secondary magnetic field, the secondary magnetic field being generated by the object of interest in response to the primary magnetic field motion sensing means (112, 114, 112�, 114� 312, 314, 312�, 314�) for sensing a relative motion between the object of interest (101) and the coil arrangement (105) and generating a trigger signal when the relative motion occurs and a processor (125) for calculating,
