FSE

The FSE family of pulse sequences uses a modification of existing SE concepts to acquire multiple lines of data per repetition to produce the desired reduction in scan time.

FSE is a fast scanning method that uses spin echoes and altered k-space filling. It is designed to provide more conventional spin-echo-type contrast in shorter times (12 to 30 seconds for a few slices). FSE produces contrast that can be associated with a selectable TR and average spin echo TE. The altered k-space traversal is significant due to the way in which TE is used and the number of times the MR experiment (TR) must be repeated in order to complete k-space.