Spiral Echo-Planar Imaging

This chapter departs somewhat from the others in this volume. Echo-planar imaging (EPI) typically refers to a scan that covers k-space in a nearly rectilinear fashion, with an oscillating gradient on one axis. Here we discuss scanning k-space in a spiral fashion, with two oscillating gradients. Of course there are many similarities between EPI and spiral k-space scanning. In fact the first research group to implement spiral scanning [1] called it spiral EPI, because it involves collecting a large portion of k-space with time-varying gradients after a single excitation, much as in Mansfield’s original experiment. For clarity, however, in this chapter the term “EPI” refers to rectilinear EPI and its variants, and “spiral scanning” refers to covering k-space in a spiral fashion. This chapter is an overview of spiral scanning rather than a systematic comparison of spiral scanning with EPI. However, we try to point out the ways in which spiral scanning differs from EPI.

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