Iterative motion compensated reconstruction for parallel imaging using an orbital navigator.

A new navigator-guided motion-compensated MR image reconstruction for segmented Cartesian imaging using multiple reception coils is presented. In-plane patient motion, comprising translation and rotation, is quantified for each scan segment by an orbital navigator. A robust and accurate approach to extract the motion parameters from the orbital navigator data is presented. The navigator information is used in an efficient iterative image reconstruction algorithm to avoid motion-induced image artifacts. Experiments in phantoms and volunteers using segmented turbo spin echo imaging as an example were performed to show the basic feasibility of this new motion compensation approach. The method can also be applied to other segmented acquisitions such as magnetization-prepared gradient echo imaging or EPI.