A Sliding-Window Re-Acquisition Scheme for Multi-Shot, Diffusion-Weighted Imaging with 2D Navigator Correction

David Andrew Porter¹, Keith Heberlein¹, Robin Martin Heideman²

A number of sequences use a 2D navigator to correct phase error in multi-shot, diffusion-weighted imaging. The limited resolution of these 2D navigators means that it is not possible to correct high-spatial-frequency phase errors. Previous studies have shown that navigator-based re-acquisition can be used to re-measure these scans and avoid artifacts in the final image, but the techniques used were not suitable for acquiring large volumes of data. This study describes the use of a modified re-acquisition scheme with diffusion-weighted, readout-segmented EPI to acquire high resolution DTI with a 32 channel head coil.