SPATIAL-FREQUENCY-TUNED MARKERS AND ADAPTIVE CORRECTION FOR ROTATIONAL MOTION

A common type of motion present in clinical magnetic resonance imaging examinations is rotational motion, such as that due to voluntary moti on during head examinations. The correction scheme presented in this w ork offers a method for eliminating the effects of rotations within th e imaging plane. Integral to the implementation of this technique is t he concept and design of spatial-frequency-tuned markers, which are us ed to track the rotational motion. These studies showed that it is pos sible to accurately track the motion, measuring both axis and angle of rotation, and use this information to retrospectively correct the acq uired images. These markers can also provide information about any tra nslational motion present. The resulting images show a marked decrease in artifacts and improved clarity.