Gradient echoes

Every repetition contains one excitation and no refocusing pulse, and the residual transverse magnetisation is spoiled at the end of each repetition. The sequences differ in the k-space trajectory acquired in each repetition.

Example	Scope
2D Cartesian gradient echo	One phase-encode line per repetition, RF-spoiled.
3D Cartesian gradient echo	One (line, partition) view per repetition, RF-spoiled.
2D Cartesian multi-echo gradient echo	One phase-encode line read at several echo times per repetition.
3D Cartesian multi-echo gradient echo	One (line, partition) view read at several echo times per repetition.
2D radial gradient echo	One full radial spoke per repetition.
3D stack-of-stars gradient echo	One spoke at one Cartesian partition per repetition.
2D spiral gradient echo	One spiral interleaf per repetition.
3D stack-of-spirals gradient echo	One interleaf at one Cartesian partition per repetition.
2D PROPELLER gradient echo	One line of one rotating blade per repetition.
3D stack-of-blades gradient echo	One blade line at one Cartesian partition per repetition.