Motion Estimation, Modeling and Compensation

MRI is intrinsically susceptible to motion artifacts; however, for the same reasons MRI offers numerous techniques for measuring motion. High performance MRI systems have increased the speed of data acquisition and thus reduced the susceptibility to unwanted motion artifacts, while increasing the accuracy of motion estimation. We are now at the limit of gradient switching speeds; peripheral nerve stimulation will not allow faster switching times unless some method is used to shield the patient from the stimulating field, so new techniques will have to work within this limitation.